| /* |
| * Copyright (C)2009-2015, 2017, 2020-2021 D. R. Commander. |
| * All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * - Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * - Neither the name of the libjpeg-turbo Project nor the names of its |
| * contributors may be used to endorse or promote products derived from this |
| * software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS", |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef __TURBOJPEG_H__ |
| #define __TURBOJPEG_H__ |
| |
| #if defined(_WIN32) && defined(DLLDEFINE) |
| #define DLLEXPORT __declspec(dllexport) |
| #else |
| #define DLLEXPORT |
| #endif |
| #define DLLCALL |
| |
| |
| /** |
| * @addtogroup TurboJPEG |
| * TurboJPEG API. This API provides an interface for generating, decoding, and |
| * transforming planar YUV and JPEG images in memory. |
| * |
| * @anchor YUVnotes |
| * YUV Image Format Notes |
| * ---------------------- |
| * Technically, the JPEG format uses the YCbCr colorspace (which is technically |
| * not a colorspace but a color transform), but per the convention of the |
| * digital video community, the TurboJPEG API uses "YUV" to refer to an image |
| * format consisting of Y, Cb, and Cr image planes. |
| * |
| * Each plane is simply a 2D array of bytes, each byte representing the value |
| * of one of the components (Y, Cb, or Cr) at a particular location in the |
| * image. The width and height of each plane are determined by the image |
| * width, height, and level of chrominance subsampling. The luminance plane |
| * width is the image width padded to the nearest multiple of the horizontal |
| * subsampling factor (2 in the case of 4:2:0 and 4:2:2, 4 in the case of |
| * 4:1:1, 1 in the case of 4:4:4 or grayscale.) Similarly, the luminance plane |
| * height is the image height padded to the nearest multiple of the vertical |
| * subsampling factor (2 in the case of 4:2:0 or 4:4:0, 1 in the case of 4:4:4 |
| * or grayscale.) This is irrespective of any additional padding that may be |
| * specified as an argument to the various YUV functions. The chrominance |
| * plane width is equal to the luminance plane width divided by the horizontal |
| * subsampling factor, and the chrominance plane height is equal to the |
| * luminance plane height divided by the vertical subsampling factor. |
| * |
| * For example, if the source image is 35 x 35 pixels and 4:2:2 subsampling is |
| * used, then the luminance plane would be 36 x 35 bytes, and each of the |
| * chrominance planes would be 18 x 35 bytes. If you specify a line padding of |
| * 4 bytes on top of this, then the luminance plane would be 36 x 35 bytes, and |
| * each of the chrominance planes would be 20 x 35 bytes. |
| * |
| * @{ |
| */ |
| |
| |
| /** |
| * The number of chrominance subsampling options |
| */ |
| #define TJ_NUMSAMP 6 |
| |
| /** |
| * Chrominance subsampling options. |
| * When pixels are converted from RGB to YCbCr (see #TJCS_YCbCr) or from CMYK |
| * to YCCK (see #TJCS_YCCK) as part of the JPEG compression process, some of |
| * the Cb and Cr (chrominance) components can be discarded or averaged together |
| * to produce a smaller image with little perceptible loss of image clarity |
| * (the human eye is more sensitive to small changes in brightness than to |
| * small changes in color.) This is called "chrominance subsampling". |
| */ |
| enum TJSAMP { |
| /** |
| * 4:4:4 chrominance subsampling (no chrominance subsampling). The JPEG or |
| * YUV image will contain one chrominance component for every pixel in the |
| * source image. |
| */ |
| TJSAMP_444 = 0, |
| /** |
| * 4:2:2 chrominance subsampling. The JPEG or YUV image will contain one |
| * chrominance component for every 2x1 block of pixels in the source image. |
| */ |
| TJSAMP_422, |
| /** |
| * 4:2:0 chrominance subsampling. The JPEG or YUV image will contain one |
| * chrominance component for every 2x2 block of pixels in the source image. |
| */ |
| TJSAMP_420, |
| /** |
| * Grayscale. The JPEG or YUV image will contain no chrominance components. |
| */ |
| TJSAMP_GRAY, |
| /** |
| * 4:4:0 chrominance subsampling. The JPEG or YUV image will contain one |
| * chrominance component for every 1x2 block of pixels in the source image. |
| * |
| * @note 4:4:0 subsampling is not fully accelerated in libjpeg-turbo. |
| */ |
| TJSAMP_440, |
| /** |
| * 4:1:1 chrominance subsampling. The JPEG or YUV image will contain one |
| * chrominance component for every 4x1 block of pixels in the source image. |
| * JPEG images compressed with 4:1:1 subsampling will be almost exactly the |
| * same size as those compressed with 4:2:0 subsampling, and in the |
| * aggregate, both subsampling methods produce approximately the same |
| * perceptual quality. However, 4:1:1 is better able to reproduce sharp |
| * horizontal features. |
| * |
| * @note 4:1:1 subsampling is not fully accelerated in libjpeg-turbo. |
| */ |
| TJSAMP_411 |
| }; |
| |
| /** |
| * MCU block width (in pixels) for a given level of chrominance subsampling. |
| * MCU block sizes: |
| * - 8x8 for no subsampling or grayscale |
| * - 16x8 for 4:2:2 |
| * - 8x16 for 4:4:0 |
| * - 16x16 for 4:2:0 |
| * - 32x8 for 4:1:1 |
| */ |
| static const int tjMCUWidth[TJ_NUMSAMP] = { 8, 16, 16, 8, 8, 32 }; |
| |
| /** |
| * MCU block height (in pixels) for a given level of chrominance subsampling. |
| * MCU block sizes: |
| * - 8x8 for no subsampling or grayscale |
| * - 16x8 for 4:2:2 |
| * - 8x16 for 4:4:0 |
| * - 16x16 for 4:2:0 |
| * - 32x8 for 4:1:1 |
| */ |
| static const int tjMCUHeight[TJ_NUMSAMP] = { 8, 8, 16, 8, 16, 8 }; |
| |
| |
| /** |
| * The number of pixel formats |
| */ |
| #define TJ_NUMPF 12 |
| |
| /** |
| * Pixel formats |
| */ |
| enum TJPF { |
| /** |
| * RGB pixel format. The red, green, and blue components in the image are |
| * stored in 3-byte pixels in the order R, G, B from lowest to highest byte |
| * address within each pixel. |
| */ |
| TJPF_RGB = 0, |
| /** |
| * BGR pixel format. The red, green, and blue components in the image are |
| * stored in 3-byte pixels in the order B, G, R from lowest to highest byte |
| * address within each pixel. |
| */ |
| TJPF_BGR, |
| /** |
| * RGBX pixel format. The red, green, and blue components in the image are |
| * stored in 4-byte pixels in the order R, G, B from lowest to highest byte |
| * address within each pixel. The X component is ignored when compressing |
| * and undefined when decompressing. |
| */ |
| TJPF_RGBX, |
| /** |
| * BGRX pixel format. The red, green, and blue components in the image are |
| * stored in 4-byte pixels in the order B, G, R from lowest to highest byte |
| * address within each pixel. The X component is ignored when compressing |
| * and undefined when decompressing. |
| */ |
| TJPF_BGRX, |
| /** |
| * XBGR pixel format. The red, green, and blue components in the image are |
| * stored in 4-byte pixels in the order R, G, B from highest to lowest byte |
| * address within each pixel. The X component is ignored when compressing |
| * and undefined when decompressing. |
| */ |
| TJPF_XBGR, |
| /** |
| * XRGB pixel format. The red, green, and blue components in the image are |
| * stored in 4-byte pixels in the order B, G, R from highest to lowest byte |
| * address within each pixel. The X component is ignored when compressing |
| * and undefined when decompressing. |
| */ |
| TJPF_XRGB, |
| /** |
| * Grayscale pixel format. Each 1-byte pixel represents a luminance |
| * (brightness) level from 0 to 255. |
| */ |
| TJPF_GRAY, |
| /** |
| * RGBA pixel format. This is the same as @ref TJPF_RGBX, except that when |
| * decompressing, the X component is guaranteed to be 0xFF, which can be |
| * interpreted as an opaque alpha channel. |
| */ |
| TJPF_RGBA, |
| /** |
| * BGRA pixel format. This is the same as @ref TJPF_BGRX, except that when |
| * decompressing, the X component is guaranteed to be 0xFF, which can be |
| * interpreted as an opaque alpha channel. |
| */ |
| TJPF_BGRA, |
| /** |
| * ABGR pixel format. This is the same as @ref TJPF_XBGR, except that when |
| * decompressing, the X component is guaranteed to be 0xFF, which can be |
| * interpreted as an opaque alpha channel. |
| */ |
| TJPF_ABGR, |
| /** |
| * ARGB pixel format. This is the same as @ref TJPF_XRGB, except that when |
| * decompressing, the X component is guaranteed to be 0xFF, which can be |
| * interpreted as an opaque alpha channel. |
| */ |
| TJPF_ARGB, |
| /** |
| * CMYK pixel format. Unlike RGB, which is an additive color model used |
| * primarily for display, CMYK (Cyan/Magenta/Yellow/Key) is a subtractive |
| * color model used primarily for printing. In the CMYK color model, the |
| * value of each color component typically corresponds to an amount of cyan, |
| * magenta, yellow, or black ink that is applied to a white background. In |
| * order to convert between CMYK and RGB, it is necessary to use a color |
| * management system (CMS.) A CMS will attempt to map colors within the |
| * printer's gamut to perceptually similar colors in the display's gamut and |
| * vice versa, but the mapping is typically not 1:1 or reversible, nor can it |
| * be defined with a simple formula. Thus, such a conversion is out of scope |
| * for a codec library. However, the TurboJPEG API allows for compressing |
| * CMYK pixels into a YCCK JPEG image (see #TJCS_YCCK) and decompressing YCCK |
| * JPEG images into CMYK pixels. |
| */ |
| TJPF_CMYK, |
| /** |
| * Unknown pixel format. Currently this is only used by #tjLoadImage(). |
| */ |
| TJPF_UNKNOWN = -1 |
| }; |
| |
| /** |
| * Red offset (in bytes) for a given pixel format. This specifies the number |
| * of bytes that the red component is offset from the start of the pixel. For |
| * instance, if a pixel of format TJ_BGRX is stored in <tt>char pixel[]</tt>, |
| * then the red component will be <tt>pixel[tjRedOffset[TJ_BGRX]]</tt>. This |
| * will be -1 if the pixel format does not have a red component. |
| */ |
| static const int tjRedOffset[TJ_NUMPF] = { |
| 0, 2, 0, 2, 3, 1, -1, 0, 2, 3, 1, -1 |
| }; |
| /** |
| * Green offset (in bytes) for a given pixel format. This specifies the number |
| * of bytes that the green component is offset from the start of the pixel. |
| * For instance, if a pixel of format TJ_BGRX is stored in |
| * <tt>char pixel[]</tt>, then the green component will be |
| * <tt>pixel[tjGreenOffset[TJ_BGRX]]</tt>. This will be -1 if the pixel format |
| * does not have a green component. |
| */ |
| static const int tjGreenOffset[TJ_NUMPF] = { |
| 1, 1, 1, 1, 2, 2, -1, 1, 1, 2, 2, -1 |
| }; |
| /** |
| * Blue offset (in bytes) for a given pixel format. This specifies the number |
| * of bytes that the Blue component is offset from the start of the pixel. For |
| * instance, if a pixel of format TJ_BGRX is stored in <tt>char pixel[]</tt>, |
| * then the blue component will be <tt>pixel[tjBlueOffset[TJ_BGRX]]</tt>. This |
| * will be -1 if the pixel format does not have a blue component. |
| */ |
| static const int tjBlueOffset[TJ_NUMPF] = { |
| 2, 0, 2, 0, 1, 3, -1, 2, 0, 1, 3, -1 |
| }; |
| /** |
| * Alpha offset (in bytes) for a given pixel format. This specifies the number |
| * of bytes that the Alpha component is offset from the start of the pixel. |
| * For instance, if a pixel of format TJ_BGRA is stored in |
| * <tt>char pixel[]</tt>, then the alpha component will be |
| * <tt>pixel[tjAlphaOffset[TJ_BGRA]]</tt>. This will be -1 if the pixel format |
| * does not have an alpha component. |
| */ |
| static const int tjAlphaOffset[TJ_NUMPF] = { |
| -1, -1, -1, -1, -1, -1, -1, 3, 3, 0, 0, -1 |
| }; |
| /** |
| * Pixel size (in bytes) for a given pixel format |
| */ |
| static const int tjPixelSize[TJ_NUMPF] = { |
| 3, 3, 4, 4, 4, 4, 1, 4, 4, 4, 4, 4 |
| }; |
| |
| |
| /** |
| * The number of JPEG colorspaces |
| */ |
| #define TJ_NUMCS 5 |
| |
| /** |
| * JPEG colorspaces |
| */ |
| enum TJCS { |
| /** |
| * RGB colorspace. When compressing the JPEG image, the R, G, and B |
| * components in the source image are reordered into image planes, but no |
| * colorspace conversion or subsampling is performed. RGB JPEG images can be |
| * decompressed to any of the extended RGB pixel formats or grayscale, but |
| * they cannot be decompressed to YUV images. |
| */ |
| TJCS_RGB = 0, |
| /** |
| * YCbCr colorspace. YCbCr is not an absolute colorspace but rather a |
| * mathematical transformation of RGB designed solely for storage and |
| * transmission. YCbCr images must be converted to RGB before they can |
| * actually be displayed. In the YCbCr colorspace, the Y (luminance) |
| * component represents the black & white portion of the original image, and |
| * the Cb and Cr (chrominance) components represent the color portion of the |
| * original image. Originally, the analog equivalent of this transformation |
| * allowed the same signal to drive both black & white and color televisions, |
| * but JPEG images use YCbCr primarily because it allows the color data to be |
| * optionally subsampled for the purposes of reducing bandwidth or disk |
| * space. YCbCr is the most common JPEG colorspace, and YCbCr JPEG images |
| * can be compressed from and decompressed to any of the extended RGB pixel |
| * formats or grayscale, or they can be decompressed to YUV planar images. |
| */ |
| TJCS_YCbCr, |
| /** |
| * Grayscale colorspace. The JPEG image retains only the luminance data (Y |
| * component), and any color data from the source image is discarded. |
| * Grayscale JPEG images can be compressed from and decompressed to any of |
| * the extended RGB pixel formats or grayscale, or they can be decompressed |
| * to YUV planar images. |
| */ |
| TJCS_GRAY, |
| /** |
| * CMYK colorspace. When compressing the JPEG image, the C, M, Y, and K |
| * components in the source image are reordered into image planes, but no |
| * colorspace conversion or subsampling is performed. CMYK JPEG images can |
| * only be decompressed to CMYK pixels. |
| */ |
| TJCS_CMYK, |
| /** |
| * YCCK colorspace. YCCK (AKA "YCbCrK") is not an absolute colorspace but |
| * rather a mathematical transformation of CMYK designed solely for storage |
| * and transmission. It is to CMYK as YCbCr is to RGB. CMYK pixels can be |
| * reversibly transformed into YCCK, and as with YCbCr, the chrominance |
| * components in the YCCK pixels can be subsampled without incurring major |
| * perceptual loss. YCCK JPEG images can only be compressed from and |
| * decompressed to CMYK pixels. |
| */ |
| TJCS_YCCK |
| }; |
| |
| |
| /** |
| * The uncompressed source/destination image is stored in bottom-up (Windows, |
| * OpenGL) order, not top-down (X11) order. |
| */ |
| #define TJFLAG_BOTTOMUP 2 |
| /** |
| * When decompressing an image that was compressed using chrominance |
| * subsampling, use the fastest chrominance upsampling algorithm available in |
| * the underlying codec. The default is to use smooth upsampling, which |
| * creates a smooth transition between neighboring chrominance components in |
| * order to reduce upsampling artifacts in the decompressed image. |
| */ |
| #define TJFLAG_FASTUPSAMPLE 256 |
| /** |
| * Disable buffer (re)allocation. If passed to one of the JPEG compression or |
| * transform functions, this flag will cause those functions to generate an |
| * error if the JPEG image buffer is invalid or too small rather than |
| * attempting to allocate or reallocate that buffer. This reproduces the |
| * behavior of earlier versions of TurboJPEG. |
| */ |
| #define TJFLAG_NOREALLOC 1024 |
| /** |
| * Use the fastest DCT/IDCT algorithm available in the underlying codec. The |
| * default if this flag is not specified is implementation-specific. For |
| * example, the implementation of TurboJPEG for libjpeg[-turbo] uses the fast |
| * algorithm by default when compressing, because this has been shown to have |
| * only a very slight effect on accuracy, but it uses the accurate algorithm |
| * when decompressing, because this has been shown to have a larger effect. |
| */ |
| #define TJFLAG_FASTDCT 2048 |
| /** |
| * Use the most accurate DCT/IDCT algorithm available in the underlying codec. |
| * The default if this flag is not specified is implementation-specific. For |
| * example, the implementation of TurboJPEG for libjpeg[-turbo] uses the fast |
| * algorithm by default when compressing, because this has been shown to have |
| * only a very slight effect on accuracy, but it uses the accurate algorithm |
| * when decompressing, because this has been shown to have a larger effect. |
| */ |
| #define TJFLAG_ACCURATEDCT 4096 |
| /** |
| * Immediately discontinue the current compression/decompression/transform |
| * operation if the underlying codec throws a warning (non-fatal error). The |
| * default behavior is to allow the operation to complete unless a fatal error |
| * is encountered. |
| */ |
| #define TJFLAG_STOPONWARNING 8192 |
| /** |
| * Use progressive entropy coding in JPEG images generated by the compression |
| * and transform functions. Progressive entropy coding will generally improve |
| * compression relative to baseline entropy coding (the default), but it will |
| * reduce compression and decompression performance considerably. |
| */ |
| #define TJFLAG_PROGRESSIVE 16384 |
| /** |
| * Limit the number of progressive JPEG scans that the decompression and |
| * transform functions will process. If a progressive JPEG image contains an |
| * unreasonably large number of scans, then this flag will cause the |
| * decompression and transform functions to return an error. The primary |
| * purpose of this is to allow security-critical applications to guard against |
| * an exploit of the progressive JPEG format described in |
| * <a href="https://libjpeg-turbo.org/pmwiki/uploads/About/TwoIssueswiththeJPEGStandard.pdf" target="_blank">this report</a>. |
| */ |
| #define TJFLAG_LIMITSCANS 32768 |
| |
| |
| /** |
| * The number of error codes |
| */ |
| #define TJ_NUMERR 2 |
| |
| /** |
| * Error codes |
| */ |
| enum TJERR { |
| /** |
| * The error was non-fatal and recoverable, but the image may still be |
| * corrupt. |
| */ |
| TJERR_WARNING = 0, |
| /** |
| * The error was fatal and non-recoverable. |
| */ |
| TJERR_FATAL |
| }; |
| |
| |
| /** |
| * The number of transform operations |
| */ |
| #define TJ_NUMXOP 8 |
| |
| /** |
| * Transform operations for #tjTransform() |
| */ |
| enum TJXOP { |
| /** |
| * Do not transform the position of the image pixels |
| */ |
| TJXOP_NONE = 0, |
| /** |
| * Flip (mirror) image horizontally. This transform is imperfect if there |
| * are any partial MCU blocks on the right edge (see #TJXOPT_PERFECT.) |
| */ |
| TJXOP_HFLIP, |
| /** |
| * Flip (mirror) image vertically. This transform is imperfect if there are |
| * any partial MCU blocks on the bottom edge (see #TJXOPT_PERFECT.) |
| */ |
| TJXOP_VFLIP, |
| /** |
| * Transpose image (flip/mirror along upper left to lower right axis.) This |
| * transform is always perfect. |
| */ |
| TJXOP_TRANSPOSE, |
| /** |
| * Transverse transpose image (flip/mirror along upper right to lower left |
| * axis.) This transform is imperfect if there are any partial MCU blocks in |
| * the image (see #TJXOPT_PERFECT.) |
| */ |
| TJXOP_TRANSVERSE, |
| /** |
| * Rotate image clockwise by 90 degrees. This transform is imperfect if |
| * there are any partial MCU blocks on the bottom edge (see |
| * #TJXOPT_PERFECT.) |
| */ |
| TJXOP_ROT90, |
| /** |
| * Rotate image 180 degrees. This transform is imperfect if there are any |
| * partial MCU blocks in the image (see #TJXOPT_PERFECT.) |
| */ |
| TJXOP_ROT180, |
| /** |
| * Rotate image counter-clockwise by 90 degrees. This transform is imperfect |
| * if there are any partial MCU blocks on the right edge (see |
| * #TJXOPT_PERFECT.) |
| */ |
| TJXOP_ROT270 |
| }; |
| |
| |
| /** |
| * This option will cause #tjTransform() to return an error if the transform is |
| * not perfect. Lossless transforms operate on MCU blocks, whose size depends |
| * on the level of chrominance subsampling used (see #tjMCUWidth |
| * and #tjMCUHeight.) If the image's width or height is not evenly divisible |
| * by the MCU block size, then there will be partial MCU blocks on the right |
| * and/or bottom edges. It is not possible to move these partial MCU blocks to |
| * the top or left of the image, so any transform that would require that is |
| * "imperfect." If this option is not specified, then any partial MCU blocks |
| * that cannot be transformed will be left in place, which will create |
| * odd-looking strips on the right or bottom edge of the image. |
| */ |
| #define TJXOPT_PERFECT 1 |
| /** |
| * This option will cause #tjTransform() to discard any partial MCU blocks that |
| * cannot be transformed. |
| */ |
| #define TJXOPT_TRIM 2 |
| /** |
| * This option will enable lossless cropping. See #tjTransform() for more |
| * information. |
| */ |
| #define TJXOPT_CROP 4 |
| /** |
| * This option will discard the color data in the input image and produce |
| * a grayscale output image. |
| */ |
| #define TJXOPT_GRAY 8 |
| /** |
| * This option will prevent #tjTransform() from outputting a JPEG image for |
| * this particular transform (this can be used in conjunction with a custom |
| * filter to capture the transformed DCT coefficients without transcoding |
| * them.) |
| */ |
| #define TJXOPT_NOOUTPUT 16 |
| /** |
| * This option will enable progressive entropy coding in the output image |
| * generated by this particular transform. Progressive entropy coding will |
| * generally improve compression relative to baseline entropy coding (the |
| * default), but it will reduce compression and decompression performance |
| * considerably. |
| */ |
| #define TJXOPT_PROGRESSIVE 32 |
| /** |
| * This option will prevent #tjTransform() from copying any extra markers |
| * (including EXIF and ICC profile data) from the source image to the output |
| * image. |
| */ |
| #define TJXOPT_COPYNONE 64 |
| |
| |
| /** |
| * Scaling factor |
| */ |
| typedef struct { |
| /** |
| * Numerator |
| */ |
| int num; |
| /** |
| * Denominator |
| */ |
| int denom; |
| } tjscalingfactor; |
| |
| /** |
| * Cropping region |
| */ |
| typedef struct { |
| /** |
| * The left boundary of the cropping region. This must be evenly divisible |
| * by the MCU block width (see #tjMCUWidth.) |
| */ |
| int x; |
| /** |
| * The upper boundary of the cropping region. This must be evenly divisible |
| * by the MCU block height (see #tjMCUHeight.) |
| */ |
| int y; |
| /** |
| * The width of the cropping region. Setting this to 0 is the equivalent of |
| * setting it to the width of the source JPEG image - x. |
| */ |
| int w; |
| /** |
| * The height of the cropping region. Setting this to 0 is the equivalent of |
| * setting it to the height of the source JPEG image - y. |
| */ |
| int h; |
| } tjregion; |
| |
| /** |
| * Lossless transform |
| */ |
| typedef struct tjtransform { |
| /** |
| * Cropping region |
| */ |
| tjregion r; |
| /** |
| * One of the @ref TJXOP "transform operations" |
| */ |
| int op; |
| /** |
| * The bitwise OR of one of more of the @ref TJXOPT_CROP "transform options" |
| */ |
| int options; |
| /** |
| * Arbitrary data that can be accessed within the body of the callback |
| * function |
| */ |
| void *data; |
| /** |
| * A callback function that can be used to modify the DCT coefficients |
| * after they are losslessly transformed but before they are transcoded to a |
| * new JPEG image. This allows for custom filters or other transformations |
| * to be applied in the frequency domain. |
| * |
| * @param coeffs pointer to an array of transformed DCT coefficients. (NOTE: |
| * this pointer is not guaranteed to be valid once the callback returns, so |
| * applications wishing to hand off the DCT coefficients to another function |
| * or library should make a copy of them within the body of the callback.) |
| * |
| * @param arrayRegion #tjregion structure containing the width and height of |
| * the array pointed to by <tt>coeffs</tt> as well as its offset relative to |
| * the component plane. TurboJPEG implementations may choose to split each |
| * component plane into multiple DCT coefficient arrays and call the callback |
| * function once for each array. |
| * |
| * @param planeRegion #tjregion structure containing the width and height of |
| * the component plane to which <tt>coeffs</tt> belongs |
| * |
| * @param componentID ID number of the component plane to which |
| * <tt>coeffs</tt> belongs (Y, Cb, and Cr have, respectively, ID's of 0, 1, |
| * and 2 in typical JPEG images.) |
| * |
| * @param transformID ID number of the transformed image to which |
| * <tt>coeffs</tt> belongs. This is the same as the index of the transform |
| * in the <tt>transforms</tt> array that was passed to #tjTransform(). |
| * |
| * @param transform a pointer to a #tjtransform structure that specifies the |
| * parameters and/or cropping region for this transform |
| * |
| * @return 0 if the callback was successful, or -1 if an error occurred. |
| */ |
| int (*customFilter) (short *coeffs, tjregion arrayRegion, |
| tjregion planeRegion, int componentIndex, |
| int transformIndex, struct tjtransform *transform); |
| } tjtransform; |
| |
| /** |
| * TurboJPEG instance handle |
| */ |
| typedef void *tjhandle; |
| |
| |
| /** |
| * Pad the given width to the nearest 32-bit boundary |
| */ |
| #define TJPAD(width) (((width) + 3) & (~3)) |
| |
| /** |
| * Compute the scaled value of <tt>dimension</tt> using the given scaling |
| * factor. This macro performs the integer equivalent of <tt>ceil(dimension * |
| * scalingFactor)</tt>. |
| */ |
| #define TJSCALED(dimension, scalingFactor) \ |
| ((dimension * scalingFactor.num + scalingFactor.denom - 1) / \ |
| scalingFactor.denom) |
| |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| |
| /** |
| * Create a TurboJPEG compressor instance. |
| * |
| * @return a handle to the newly-created instance, or NULL if an error |
| * occurred (see #tjGetErrorStr2().) |
| */ |
| DLLEXPORT tjhandle tjInitCompress(void); |
| |
| |
| /** |
| * Compress an RGB, grayscale, or CMYK image into a JPEG image. |
| * |
| * @param handle a handle to a TurboJPEG compressor or transformer instance |
| * |
| * @param srcBuf pointer to an image buffer containing RGB, grayscale, or |
| * CMYK pixels to be compressed |
| * |
| * @param width width (in pixels) of the source image |
| * |
| * @param pitch bytes per line in the source image. Normally, this should be |
| * <tt>width * #tjPixelSize[pixelFormat]</tt> if the image is unpadded, or |
| * <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each line of the image |
| * is padded to the nearest 32-bit boundary, as is the case for Windows |
| * bitmaps. You can also be clever and use this parameter to skip lines, etc. |
| * Setting this parameter to 0 is the equivalent of setting it to |
| * <tt>width * #tjPixelSize[pixelFormat]</tt>. |
| * |
| * @param height height (in pixels) of the source image |
| * |
| * @param pixelFormat pixel format of the source image (see @ref TJPF |
| * "Pixel formats".) |
| * |
| * @param jpegBuf address of a pointer to an image buffer that will receive the |
| * JPEG image. TurboJPEG has the ability to reallocate the JPEG buffer |
| * to accommodate the size of the JPEG image. Thus, you can choose to: |
| * -# pre-allocate the JPEG buffer with an arbitrary size using #tjAlloc() and |
| * let TurboJPEG grow the buffer as needed, |
| * -# set <tt>*jpegBuf</tt> to NULL to tell TurboJPEG to allocate the buffer |
| * for you, or |
| * -# pre-allocate the buffer to a "worst case" size determined by calling |
| * #tjBufSize(). This should ensure that the buffer never has to be |
| * re-allocated (setting #TJFLAG_NOREALLOC guarantees that it won't be.) |
| * . |
| * If you choose option 1, <tt>*jpegSize</tt> should be set to the size of your |
| * pre-allocated buffer. In any case, unless you have set #TJFLAG_NOREALLOC, |
| * you should always check <tt>*jpegBuf</tt> upon return from this function, as |
| * it may have changed. |
| * |
| * @param jpegSize pointer to an unsigned long variable that holds the size of |
| * the JPEG image buffer. If <tt>*jpegBuf</tt> points to a pre-allocated |
| * buffer, then <tt>*jpegSize</tt> should be set to the size of the buffer. |
| * Upon return, <tt>*jpegSize</tt> will contain the size of the JPEG image (in |
| * bytes.) If <tt>*jpegBuf</tt> points to a JPEG image buffer that is being |
| * reused from a previous call to one of the JPEG compression functions, then |
| * <tt>*jpegSize</tt> is ignored. |
| * |
| * @param jpegSubsamp the level of chrominance subsampling to be used when |
| * generating the JPEG image (see @ref TJSAMP |
| * "Chrominance subsampling options".) |
| * |
| * @param jpegQual the image quality of the generated JPEG image (1 = worst, |
| * 100 = best) |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT |
| * "flags" |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjCompress2(tjhandle handle, const unsigned char *srcBuf, |
| int width, int pitch, int height, int pixelFormat, |
| unsigned char **jpegBuf, unsigned long *jpegSize, |
| int jpegSubsamp, int jpegQual, int flags); |
| |
| |
| /** |
| * Compress a YUV planar image into a JPEG image. |
| * |
| * @param handle a handle to a TurboJPEG compressor or transformer instance |
| * |
| * @param srcBuf pointer to an image buffer containing a YUV planar image to be |
| * compressed. The size of this buffer should match the value returned by |
| * #tjBufSizeYUV2() for the given image width, height, padding, and level of |
| * chrominance subsampling. The Y, U (Cb), and V (Cr) image planes should be |
| * stored sequentially in the source buffer (refer to @ref YUVnotes |
| * "YUV Image Format Notes".) |
| * |
| * @param width width (in pixels) of the source image. If the width is not an |
| * even multiple of the MCU block width (see #tjMCUWidth), then an intermediate |
| * buffer copy will be performed within TurboJPEG. |
| * |
| * @param pad the line padding used in the source image. For instance, if each |
| * line in each plane of the YUV image is padded to the nearest multiple of 4 |
| * bytes, then <tt>pad</tt> should be set to 4. |
| * |
| * @param height height (in pixels) of the source image. If the height is not |
| * an even multiple of the MCU block height (see #tjMCUHeight), then an |
| * intermediate buffer copy will be performed within TurboJPEG. |
| * |
| * @param subsamp the level of chrominance subsampling used in the source |
| * image (see @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @param jpegBuf address of a pointer to an image buffer that will receive the |
| * JPEG image. TurboJPEG has the ability to reallocate the JPEG buffer to |
| * accommodate the size of the JPEG image. Thus, you can choose to: |
| * -# pre-allocate the JPEG buffer with an arbitrary size using #tjAlloc() and |
| * let TurboJPEG grow the buffer as needed, |
| * -# set <tt>*jpegBuf</tt> to NULL to tell TurboJPEG to allocate the buffer |
| * for you, or |
| * -# pre-allocate the buffer to a "worst case" size determined by calling |
| * #tjBufSize(). This should ensure that the buffer never has to be |
| * re-allocated (setting #TJFLAG_NOREALLOC guarantees that it won't be.) |
| * . |
| * If you choose option 1, <tt>*jpegSize</tt> should be set to the size of your |
| * pre-allocated buffer. In any case, unless you have set #TJFLAG_NOREALLOC, |
| * you should always check <tt>*jpegBuf</tt> upon return from this function, as |
| * it may have changed. |
| * |
| * @param jpegSize pointer to an unsigned long variable that holds the size of |
| * the JPEG image buffer. If <tt>*jpegBuf</tt> points to a pre-allocated |
| * buffer, then <tt>*jpegSize</tt> should be set to the size of the buffer. |
| * Upon return, <tt>*jpegSize</tt> will contain the size of the JPEG image (in |
| * bytes.) If <tt>*jpegBuf</tt> points to a JPEG image buffer that is being |
| * reused from a previous call to one of the JPEG compression functions, then |
| * <tt>*jpegSize</tt> is ignored. |
| * |
| * @param jpegQual the image quality of the generated JPEG image (1 = worst, |
| * 100 = best) |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT |
| * "flags" |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjCompressFromYUV(tjhandle handle, const unsigned char *srcBuf, |
| int width, int pad, int height, int subsamp, |
| unsigned char **jpegBuf, |
| unsigned long *jpegSize, int jpegQual, |
| int flags); |
| |
| |
| /** |
| * Compress a set of Y, U (Cb), and V (Cr) image planes into a JPEG image. |
| * |
| * @param handle a handle to a TurboJPEG compressor or transformer instance |
| * |
| * @param srcPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes |
| * (or just a Y plane, if compressing a grayscale image) that contain a YUV |
| * image to be compressed. These planes can be contiguous or non-contiguous in |
| * memory. The size of each plane should match the value returned by |
| * #tjPlaneSizeYUV() for the given image width, height, strides, and level of |
| * chrominance subsampling. Refer to @ref YUVnotes "YUV Image Format Notes" |
| * for more details. |
| * |
| * @param width width (in pixels) of the source image. If the width is not an |
| * even multiple of the MCU block width (see #tjMCUWidth), then an intermediate |
| * buffer copy will be performed within TurboJPEG. |
| * |
| * @param strides an array of integers, each specifying the number of bytes per |
| * line in the corresponding plane of the YUV source image. Setting the stride |
| * for any plane to 0 is the same as setting it to the plane width (see |
| * @ref YUVnotes "YUV Image Format Notes".) If <tt>strides</tt> is NULL, then |
| * the strides for all planes will be set to their respective plane widths. |
| * You can adjust the strides in order to specify an arbitrary amount of line |
| * padding in each plane or to create a JPEG image from a subregion of a larger |
| * YUV planar image. |
| * |
| * @param height height (in pixels) of the source image. If the height is not |
| * an even multiple of the MCU block height (see #tjMCUHeight), then an |
| * intermediate buffer copy will be performed within TurboJPEG. |
| * |
| * @param subsamp the level of chrominance subsampling used in the source |
| * image (see @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @param jpegBuf address of a pointer to an image buffer that will receive the |
| * JPEG image. TurboJPEG has the ability to reallocate the JPEG buffer to |
| * accommodate the size of the JPEG image. Thus, you can choose to: |
| * -# pre-allocate the JPEG buffer with an arbitrary size using #tjAlloc() and |
| * let TurboJPEG grow the buffer as needed, |
| * -# set <tt>*jpegBuf</tt> to NULL to tell TurboJPEG to allocate the buffer |
| * for you, or |
| * -# pre-allocate the buffer to a "worst case" size determined by calling |
| * #tjBufSize(). This should ensure that the buffer never has to be |
| * re-allocated (setting #TJFLAG_NOREALLOC guarantees that it won't be.) |
| * . |
| * If you choose option 1, <tt>*jpegSize</tt> should be set to the size of your |
| * pre-allocated buffer. In any case, unless you have set #TJFLAG_NOREALLOC, |
| * you should always check <tt>*jpegBuf</tt> upon return from this function, as |
| * it may have changed. |
| * |
| * @param jpegSize pointer to an unsigned long variable that holds the size of |
| * the JPEG image buffer. If <tt>*jpegBuf</tt> points to a pre-allocated |
| * buffer, then <tt>*jpegSize</tt> should be set to the size of the buffer. |
| * Upon return, <tt>*jpegSize</tt> will contain the size of the JPEG image (in |
| * bytes.) If <tt>*jpegBuf</tt> points to a JPEG image buffer that is being |
| * reused from a previous call to one of the JPEG compression functions, then |
| * <tt>*jpegSize</tt> is ignored. |
| * |
| * @param jpegQual the image quality of the generated JPEG image (1 = worst, |
| * 100 = best) |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT |
| * "flags" |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjCompressFromYUVPlanes(tjhandle handle, |
| const unsigned char **srcPlanes, |
| int width, const int *strides, |
| int height, int subsamp, |
| unsigned char **jpegBuf, |
| unsigned long *jpegSize, int jpegQual, |
| int flags); |
| |
| |
| /** |
| * The maximum size of the buffer (in bytes) required to hold a JPEG image with |
| * the given parameters. The number of bytes returned by this function is |
| * larger than the size of the uncompressed source image. The reason for this |
| * is that the JPEG format uses 16-bit coefficients, and it is thus possible |
| * for a very high-quality JPEG image with very high-frequency content to |
| * expand rather than compress when converted to the JPEG format. Such images |
| * represent a very rare corner case, but since there is no way to predict the |
| * size of a JPEG image prior to compression, the corner case has to be |
| * handled. |
| * |
| * @param width width (in pixels) of the image |
| * |
| * @param height height (in pixels) of the image |
| * |
| * @param jpegSubsamp the level of chrominance subsampling to be used when |
| * generating the JPEG image (see @ref TJSAMP |
| * "Chrominance subsampling options".) |
| * |
| * @return the maximum size of the buffer (in bytes) required to hold the |
| * image, or -1 if the arguments are out of bounds. |
| */ |
| DLLEXPORT unsigned long tjBufSize(int width, int height, int jpegSubsamp); |
| |
| |
| /** |
| * The size of the buffer (in bytes) required to hold a YUV planar image with |
| * the given parameters. |
| * |
| * @param width width (in pixels) of the image |
| * |
| * @param pad the width of each line in each plane of the image is padded to |
| * the nearest multiple of this number of bytes (must be a power of 2.) |
| * |
| * @param height height (in pixels) of the image |
| * |
| * @param subsamp level of chrominance subsampling in the image (see |
| * @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @return the size of the buffer (in bytes) required to hold the image, or |
| * -1 if the arguments are out of bounds. |
| */ |
| DLLEXPORT unsigned long tjBufSizeYUV2(int width, int pad, int height, |
| int subsamp); |
| |
| |
| /** |
| * The size of the buffer (in bytes) required to hold a YUV image plane with |
| * the given parameters. |
| * |
| * @param componentID ID number of the image plane (0 = Y, 1 = U/Cb, 2 = V/Cr) |
| * |
| * @param width width (in pixels) of the YUV image. NOTE: this is the width of |
| * the whole image, not the plane width. |
| * |
| * @param stride bytes per line in the image plane. Setting this to 0 is the |
| * equivalent of setting it to the plane width. |
| * |
| * @param height height (in pixels) of the YUV image. NOTE: this is the height |
| * of the whole image, not the plane height. |
| * |
| * @param subsamp level of chrominance subsampling in the image (see |
| * @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @return the size of the buffer (in bytes) required to hold the YUV image |
| * plane, or -1 if the arguments are out of bounds. |
| */ |
| DLLEXPORT unsigned long tjPlaneSizeYUV(int componentID, int width, int stride, |
| int height, int subsamp); |
| |
| |
| /** |
| * The plane width of a YUV image plane with the given parameters. Refer to |
| * @ref YUVnotes "YUV Image Format Notes" for a description of plane width. |
| * |
| * @param componentID ID number of the image plane (0 = Y, 1 = U/Cb, 2 = V/Cr) |
| * |
| * @param width width (in pixels) of the YUV image |
| * |
| * @param subsamp level of chrominance subsampling in the image (see |
| * @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @return the plane width of a YUV image plane with the given parameters, or |
| * -1 if the arguments are out of bounds. |
| */ |
| DLLEXPORT int tjPlaneWidth(int componentID, int width, int subsamp); |
| |
| |
| /** |
| * The plane height of a YUV image plane with the given parameters. Refer to |
| * @ref YUVnotes "YUV Image Format Notes" for a description of plane height. |
| * |
| * @param componentID ID number of the image plane (0 = Y, 1 = U/Cb, 2 = V/Cr) |
| * |
| * @param height height (in pixels) of the YUV image |
| * |
| * @param subsamp level of chrominance subsampling in the image (see |
| * @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @return the plane height of a YUV image plane with the given parameters, or |
| * -1 if the arguments are out of bounds. |
| */ |
| DLLEXPORT int tjPlaneHeight(int componentID, int height, int subsamp); |
| |
| |
| /** |
| * Encode an RGB or grayscale image into a YUV planar image. This function |
| * uses the accelerated color conversion routines in the underlying |
| * codec but does not execute any of the other steps in the JPEG compression |
| * process. |
| * |
| * @param handle a handle to a TurboJPEG compressor or transformer instance |
| * |
| * @param srcBuf pointer to an image buffer containing RGB or grayscale pixels |
| * to be encoded |
| * |
| * @param width width (in pixels) of the source image |
| * |
| * @param pitch bytes per line in the source image. Normally, this should be |
| * <tt>width * #tjPixelSize[pixelFormat]</tt> if the image is unpadded, or |
| * <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each line of the image |
| * is padded to the nearest 32-bit boundary, as is the case for Windows |
| * bitmaps. You can also be clever and use this parameter to skip lines, etc. |
| * Setting this parameter to 0 is the equivalent of setting it to |
| * <tt>width * #tjPixelSize[pixelFormat]</tt>. |
| * |
| * @param height height (in pixels) of the source image |
| * |
| * @param pixelFormat pixel format of the source image (see @ref TJPF |
| * "Pixel formats".) |
| * |
| * @param dstBuf pointer to an image buffer that will receive the YUV image. |
| * Use #tjBufSizeYUV2() to determine the appropriate size for this buffer based |
| * on the image width, height, padding, and level of chrominance subsampling. |
| * The Y, U (Cb), and V (Cr) image planes will be stored sequentially in the |
| * buffer (refer to @ref YUVnotes "YUV Image Format Notes".) |
| * |
| * @param pad the width of each line in each plane of the YUV image will be |
| * padded to the nearest multiple of this number of bytes (must be a power of |
| * 2.) To generate images suitable for X Video, <tt>pad</tt> should be set to |
| * 4. |
| * |
| * @param subsamp the level of chrominance subsampling to be used when |
| * generating the YUV image (see @ref TJSAMP |
| * "Chrominance subsampling options".) To generate images suitable for X |
| * Video, <tt>subsamp</tt> should be set to @ref TJSAMP_420. This produces an |
| * image compatible with the I420 (AKA "YUV420P") format. |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT |
| * "flags" |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjEncodeYUV3(tjhandle handle, const unsigned char *srcBuf, |
| int width, int pitch, int height, int pixelFormat, |
| unsigned char *dstBuf, int pad, int subsamp, |
| int flags); |
| |
| |
| /** |
| * Encode an RGB or grayscale image into separate Y, U (Cb), and V (Cr) image |
| * planes. This function uses the accelerated color conversion routines in the |
| * underlying codec but does not execute any of the other steps in the JPEG |
| * compression process. |
| * |
| * @param handle a handle to a TurboJPEG compressor or transformer instance |
| * |
| * @param srcBuf pointer to an image buffer containing RGB or grayscale pixels |
| * to be encoded |
| * |
| * @param width width (in pixels) of the source image |
| * |
| * @param pitch bytes per line in the source image. Normally, this should be |
| * <tt>width * #tjPixelSize[pixelFormat]</tt> if the image is unpadded, or |
| * <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each line of the image |
| * is padded to the nearest 32-bit boundary, as is the case for Windows |
| * bitmaps. You can also be clever and use this parameter to skip lines, etc. |
| * Setting this parameter to 0 is the equivalent of setting it to |
| * <tt>width * #tjPixelSize[pixelFormat]</tt>. |
| * |
| * @param height height (in pixels) of the source image |
| * |
| * @param pixelFormat pixel format of the source image (see @ref TJPF |
| * "Pixel formats".) |
| * |
| * @param dstPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes |
| * (or just a Y plane, if generating a grayscale image) that will receive the |
| * encoded image. These planes can be contiguous or non-contiguous in memory. |
| * Use #tjPlaneSizeYUV() to determine the appropriate size for each plane based |
| * on the image width, height, strides, and level of chrominance subsampling. |
| * Refer to @ref YUVnotes "YUV Image Format Notes" for more details. |
| * |
| * @param strides an array of integers, each specifying the number of bytes per |
| * line in the corresponding plane of the output image. Setting the stride for |
| * any plane to 0 is the same as setting it to the plane width (see |
| * @ref YUVnotes "YUV Image Format Notes".) If <tt>strides</tt> is NULL, then |
| * the strides for all planes will be set to their respective plane widths. |
| * You can adjust the strides in order to add an arbitrary amount of line |
| * padding to each plane or to encode an RGB or grayscale image into a |
| * subregion of a larger YUV planar image. |
| * |
| * @param subsamp the level of chrominance subsampling to be used when |
| * generating the YUV image (see @ref TJSAMP |
| * "Chrominance subsampling options".) To generate images suitable for X |
| * Video, <tt>subsamp</tt> should be set to @ref TJSAMP_420. This produces an |
| * image compatible with the I420 (AKA "YUV420P") format. |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT |
| * "flags" |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjEncodeYUVPlanes(tjhandle handle, const unsigned char *srcBuf, |
| int width, int pitch, int height, |
| int pixelFormat, unsigned char **dstPlanes, |
| int *strides, int subsamp, int flags); |
| |
| |
| /** |
| * Create a TurboJPEG decompressor instance. |
| * |
| * @return a handle to the newly-created instance, or NULL if an error |
| * occurred (see #tjGetErrorStr2().) |
| */ |
| DLLEXPORT tjhandle tjInitDecompress(void); |
| |
| |
| /** |
| * Retrieve information about a JPEG image without decompressing it. |
| * |
| * @param handle a handle to a TurboJPEG decompressor or transformer instance |
| * |
| * @param jpegBuf pointer to a buffer containing a JPEG image |
| * |
| * @param jpegSize size of the JPEG image (in bytes) |
| * |
| * @param width pointer to an integer variable that will receive the width (in |
| * pixels) of the JPEG image |
| * |
| * @param height pointer to an integer variable that will receive the height |
| * (in pixels) of the JPEG image |
| * |
| * @param jpegSubsamp pointer to an integer variable that will receive the |
| * level of chrominance subsampling used when the JPEG image was compressed |
| * (see @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @param jpegColorspace pointer to an integer variable that will receive one |
| * of the JPEG colorspace constants, indicating the colorspace of the JPEG |
| * image (see @ref TJCS "JPEG colorspaces".) |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjDecompressHeader3(tjhandle handle, |
| const unsigned char *jpegBuf, |
| unsigned long jpegSize, int *width, |
| int *height, int *jpegSubsamp, |
| int *jpegColorspace); |
| |
| |
| /** |
| * Returns a list of fractional scaling factors that the JPEG decompressor in |
| * this implementation of TurboJPEG supports. |
| * |
| * @param numscalingfactors pointer to an integer variable that will receive |
| * the number of elements in the list |
| * |
| * @return a pointer to a list of fractional scaling factors, or NULL if an |
| * error is encountered (see #tjGetErrorStr2().) |
| */ |
| DLLEXPORT tjscalingfactor *tjGetScalingFactors(int *numscalingfactors); |
| |
| |
| /** |
| * Decompress a JPEG image to an RGB, grayscale, or CMYK image. |
| * |
| * @param handle a handle to a TurboJPEG decompressor or transformer instance |
| * |
| * @param jpegBuf pointer to a buffer containing the JPEG image to decompress |
| * |
| * @param jpegSize size of the JPEG image (in bytes) |
| * |
| * @param dstBuf pointer to an image buffer that will receive the decompressed |
| * image. This buffer should normally be <tt>pitch * scaledHeight</tt> bytes |
| * in size, where <tt>scaledHeight</tt> can be determined by calling |
| * #TJSCALED() with the JPEG image height and one of the scaling factors |
| * returned by #tjGetScalingFactors(). The <tt>dstBuf</tt> pointer may also be |
| * used to decompress into a specific region of a larger buffer. |
| * |
| * @param width desired width (in pixels) of the destination image. If this is |
| * different than the width of the JPEG image being decompressed, then |
| * TurboJPEG will use scaling in the JPEG decompressor to generate the largest |
| * possible image that will fit within the desired width. If <tt>width</tt> is |
| * set to 0, then only the height will be considered when determining the |
| * scaled image size. |
| * |
| * @param pitch bytes per line in the destination image. Normally, this is |
| * <tt>scaledWidth * #tjPixelSize[pixelFormat]</tt> if the decompressed image |
| * is unpadded, else <tt>#TJPAD(scaledWidth * #tjPixelSize[pixelFormat])</tt> |
| * if each line of the decompressed image is padded to the nearest 32-bit |
| * boundary, as is the case for Windows bitmaps. (NOTE: <tt>scaledWidth</tt> |
| * can be determined by calling #TJSCALED() with the JPEG image width and one |
| * of the scaling factors returned by #tjGetScalingFactors().) You can also be |
| * clever and use the pitch parameter to skip lines, etc. Setting this |
| * parameter to 0 is the equivalent of setting it to |
| * <tt>scaledWidth * #tjPixelSize[pixelFormat]</tt>. |
| * |
| * @param height desired height (in pixels) of the destination image. If this |
| * is different than the height of the JPEG image being decompressed, then |
| * TurboJPEG will use scaling in the JPEG decompressor to generate the largest |
| * possible image that will fit within the desired height. If <tt>height</tt> |
| * is set to 0, then only the width will be considered when determining the |
| * scaled image size. |
| * |
| * @param pixelFormat pixel format of the destination image (see @ref |
| * TJPF "Pixel formats".) |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT |
| * "flags" |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjDecompress2(tjhandle handle, const unsigned char *jpegBuf, |
| unsigned long jpegSize, unsigned char *dstBuf, |
| int width, int pitch, int height, int pixelFormat, |
| int flags); |
| |
| |
| /** |
| * Decompress a JPEG image to a YUV planar image. This function performs JPEG |
| * decompression but leaves out the color conversion step, so a planar YUV |
| * image is generated instead of an RGB image. |
| * |
| * @param handle a handle to a TurboJPEG decompressor or transformer instance |
| * |
| * @param jpegBuf pointer to a buffer containing the JPEG image to decompress |
| * |
| * @param jpegSize size of the JPEG image (in bytes) |
| * |
| * @param dstBuf pointer to an image buffer that will receive the YUV image. |
| * Use #tjBufSizeYUV2() to determine the appropriate size for this buffer based |
| * on the image width, height, padding, and level of subsampling. The Y, |
| * U (Cb), and V (Cr) image planes will be stored sequentially in the buffer |
| * (refer to @ref YUVnotes "YUV Image Format Notes".) |
| * |
| * @param width desired width (in pixels) of the YUV image. If this is |
| * different than the width of the JPEG image being decompressed, then |
| * TurboJPEG will use scaling in the JPEG decompressor to generate the largest |
| * possible image that will fit within the desired width. If <tt>width</tt> is |
| * set to 0, then only the height will be considered when determining the |
| * scaled image size. If the scaled width is not an even multiple of the MCU |
| * block width (see #tjMCUWidth), then an intermediate buffer copy will be |
| * performed within TurboJPEG. |
| * |
| * @param pad the width of each line in each plane of the YUV image will be |
| * padded to the nearest multiple of this number of bytes (must be a power of |
| * 2.) To generate images suitable for X Video, <tt>pad</tt> should be set to |
| * 4. |
| * |
| * @param height desired height (in pixels) of the YUV image. If this is |
| * different than the height of the JPEG image being decompressed, then |
| * TurboJPEG will use scaling in the JPEG decompressor to generate the largest |
| * possible image that will fit within the desired height. If <tt>height</tt> |
| * is set to 0, then only the width will be considered when determining the |
| * scaled image size. If the scaled height is not an even multiple of the MCU |
| * block height (see #tjMCUHeight), then an intermediate buffer copy will be |
| * performed within TurboJPEG. |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT |
| * "flags" |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjDecompressToYUV2(tjhandle handle, const unsigned char *jpegBuf, |
| unsigned long jpegSize, unsigned char *dstBuf, |
| int width, int pad, int height, int flags); |
| |
| |
| /** |
| * Decompress a JPEG image into separate Y, U (Cb), and V (Cr) image |
| * planes. This function performs JPEG decompression but leaves out the color |
| * conversion step, so a planar YUV image is generated instead of an RGB image. |
| * |
| * @param handle a handle to a TurboJPEG decompressor or transformer instance |
| * |
| * @param jpegBuf pointer to a buffer containing the JPEG image to decompress |
| * |
| * @param jpegSize size of the JPEG image (in bytes) |
| * |
| * @param dstPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes |
| * (or just a Y plane, if decompressing a grayscale image) that will receive |
| * the YUV image. These planes can be contiguous or non-contiguous in memory. |
| * Use #tjPlaneSizeYUV() to determine the appropriate size for each plane based |
| * on the scaled image width, scaled image height, strides, and level of |
| * chrominance subsampling. Refer to @ref YUVnotes "YUV Image Format Notes" |
| * for more details. |
| * |
| * @param width desired width (in pixels) of the YUV image. If this is |
| * different than the width of the JPEG image being decompressed, then |
| * TurboJPEG will use scaling in the JPEG decompressor to generate the largest |
| * possible image that will fit within the desired width. If <tt>width</tt> is |
| * set to 0, then only the height will be considered when determining the |
| * scaled image size. If the scaled width is not an even multiple of the MCU |
| * block width (see #tjMCUWidth), then an intermediate buffer copy will be |
| * performed within TurboJPEG. |
| * |
| * @param strides an array of integers, each specifying the number of bytes per |
| * line in the corresponding plane of the output image. Setting the stride for |
| * any plane to 0 is the same as setting it to the scaled plane width (see |
| * @ref YUVnotes "YUV Image Format Notes".) If <tt>strides</tt> is NULL, then |
| * the strides for all planes will be set to their respective scaled plane |
| * widths. You can adjust the strides in order to add an arbitrary amount of |
| * line padding to each plane or to decompress the JPEG image into a subregion |
| * of a larger YUV planar image. |
| * |
| * @param height desired height (in pixels) of the YUV image. If this is |
| * different than the height of the JPEG image being decompressed, then |
| * TurboJPEG will use scaling in the JPEG decompressor to generate the largest |
| * possible image that will fit within the desired height. If <tt>height</tt> |
| * is set to 0, then only the width will be considered when determining the |
| * scaled image size. If the scaled height is not an even multiple of the MCU |
| * block height (see #tjMCUHeight), then an intermediate buffer copy will be |
| * performed within TurboJPEG. |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT |
| * "flags" |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjDecompressToYUVPlanes(tjhandle handle, |
| const unsigned char *jpegBuf, |
| unsigned long jpegSize, |
| unsigned char **dstPlanes, int width, |
| int *strides, int height, int flags); |
| |
| |
| /** |
| * Decode a YUV planar image into an RGB or grayscale image. This function |
| * uses the accelerated color conversion routines in the underlying |
| * codec but does not execute any of the other steps in the JPEG decompression |
| * process. |
| * |
| * @param handle a handle to a TurboJPEG decompressor or transformer instance |
| * |
| * @param srcBuf pointer to an image buffer containing a YUV planar image to be |
| * decoded. The size of this buffer should match the value returned by |
| * #tjBufSizeYUV2() for the given image width, height, padding, and level of |
| * chrominance subsampling. The Y, U (Cb), and V (Cr) image planes should be |
| * stored sequentially in the source buffer (refer to @ref YUVnotes |
| * "YUV Image Format Notes".) |
| * |
| * @param pad Use this parameter to specify that the width of each line in each |
| * plane of the YUV source image is padded to the nearest multiple of this |
| * number of bytes (must be a power of 2.) |
| * |
| * @param subsamp the level of chrominance subsampling used in the YUV source |
| * image (see @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @param dstBuf pointer to an image buffer that will receive the decoded |
| * image. This buffer should normally be <tt>pitch * height</tt> bytes in |
| * size, but the <tt>dstBuf</tt> pointer can also be used to decode into a |
| * specific region of a larger buffer. |
| * |
| * @param width width (in pixels) of the source and destination images |
| * |
| * @param pitch bytes per line in the destination image. Normally, this should |
| * be <tt>width * #tjPixelSize[pixelFormat]</tt> if the destination image is |
| * unpadded, or <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each line |
| * of the destination image should be padded to the nearest 32-bit boundary, as |
| * is the case for Windows bitmaps. You can also be clever and use the pitch |
| * parameter to skip lines, etc. Setting this parameter to 0 is the equivalent |
| * of setting it to <tt>width * #tjPixelSize[pixelFormat]</tt>. |
| * |
| * @param height height (in pixels) of the source and destination images |
| * |
| * @param pixelFormat pixel format of the destination image (see @ref TJPF |
| * "Pixel formats".) |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT |
| * "flags" |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjDecodeYUV(tjhandle handle, const unsigned char *srcBuf, |
| int pad, int subsamp, unsigned char *dstBuf, |
| int width, int pitch, int height, int pixelFormat, |
| int flags); |
| |
| |
| /** |
| * Decode a set of Y, U (Cb), and V (Cr) image planes into an RGB or grayscale |
| * image. This function uses the accelerated color conversion routines in the |
| * underlying codec but does not execute any of the other steps in the JPEG |
| * decompression process. |
| * |
| * @param handle a handle to a TurboJPEG decompressor or transformer instance |
| * |
| * @param srcPlanes an array of pointers to Y, U (Cb), and V (Cr) image planes |
| * (or just a Y plane, if decoding a grayscale image) that contain a YUV image |
| * to be decoded. These planes can be contiguous or non-contiguous in memory. |
| * The size of each plane should match the value returned by #tjPlaneSizeYUV() |
| * for the given image width, height, strides, and level of chrominance |
| * subsampling. Refer to @ref YUVnotes "YUV Image Format Notes" for more |
| * details. |
| * |
| * @param strides an array of integers, each specifying the number of bytes per |
| * line in the corresponding plane of the YUV source image. Setting the stride |
| * for any plane to 0 is the same as setting it to the plane width (see |
| * @ref YUVnotes "YUV Image Format Notes".) If <tt>strides</tt> is NULL, then |
| * the strides for all planes will be set to their respective plane widths. |
| * You can adjust the strides in order to specify an arbitrary amount of line |
| * padding in each plane or to decode a subregion of a larger YUV planar image. |
| * |
| * @param subsamp the level of chrominance subsampling used in the YUV source |
| * image (see @ref TJSAMP "Chrominance subsampling options".) |
| * |
| * @param dstBuf pointer to an image buffer that will receive the decoded |
| * image. This buffer should normally be <tt>pitch * height</tt> bytes in |
| * size, but the <tt>dstBuf</tt> pointer can also be used to decode into a |
| * specific region of a larger buffer. |
| * |
| * @param width width (in pixels) of the source and destination images |
| * |
| * @param pitch bytes per line in the destination image. Normally, this should |
| * be <tt>width * #tjPixelSize[pixelFormat]</tt> if the destination image is |
| * unpadded, or <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each line |
| * of the destination image should be padded to the nearest 32-bit boundary, as |
| * is the case for Windows bitmaps. You can also be clever and use the pitch |
| * parameter to skip lines, etc. Setting this parameter to 0 is the equivalent |
| * of setting it to <tt>width * #tjPixelSize[pixelFormat]</tt>. |
| * |
| * @param height height (in pixels) of the source and destination images |
| * |
| * @param pixelFormat pixel format of the destination image (see @ref TJPF |
| * "Pixel formats".) |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT |
| * "flags" |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjDecodeYUVPlanes(tjhandle handle, |
| const unsigned char **srcPlanes, |
| const int *strides, int subsamp, |
| unsigned char *dstBuf, int width, int pitch, |
| int height, int pixelFormat, int flags); |
| |
| |
| /** |
| * Create a new TurboJPEG transformer instance. |
| * |
| * @return a handle to the newly-created instance, or NULL if an error |
| * occurred (see #tjGetErrorStr2().) |
| */ |
| DLLEXPORT tjhandle tjInitTransform(void); |
| |
| |
| /** |
| * Losslessly transform a JPEG image into another JPEG image. Lossless |
| * transforms work by moving the raw DCT coefficients from one JPEG image |
| * structure to another without altering the values of the coefficients. While |
| * this is typically faster than decompressing the image, transforming it, and |
| * re-compressing it, lossless transforms are not free. Each lossless |
| * transform requires reading and performing Huffman decoding on all of the |
| * coefficients in the source image, regardless of the size of the destination |
| * image. Thus, this function provides a means of generating multiple |
| * transformed images from the same source or applying multiple |
| * transformations simultaneously, in order to eliminate the need to read the |
| * source coefficients multiple times. |
| * |
| * @param handle a handle to a TurboJPEG transformer instance |
| * |
| * @param jpegBuf pointer to a buffer containing the JPEG source image to |
| * transform |
| * |
| * @param jpegSize size of the JPEG source image (in bytes) |
| * |
| * @param n the number of transformed JPEG images to generate |
| * |
| * @param dstBufs pointer to an array of n image buffers. <tt>dstBufs[i]</tt> |
| * will receive a JPEG image that has been transformed using the parameters in |
| * <tt>transforms[i]</tt>. TurboJPEG has the ability to reallocate the JPEG |
| * buffer to accommodate the size of the JPEG image. Thus, you can choose to: |
| * -# pre-allocate the JPEG buffer with an arbitrary size using #tjAlloc() and |
| * let TurboJPEG grow the buffer as needed, |
| * -# set <tt>dstBufs[i]</tt> to NULL to tell TurboJPEG to allocate the buffer |
| * for you, or |
| * -# pre-allocate the buffer to a "worst case" size determined by calling |
| * #tjBufSize() with the transformed or cropped width and height. Under normal |
| * circumstances, this should ensure that the buffer never has to be |
| * re-allocated (setting #TJFLAG_NOREALLOC guarantees that it won't be.) Note, |
| * however, that there are some rare cases (such as transforming images with a |
| * large amount of embedded EXIF or ICC profile data) in which the output image |
| * will be larger than the worst-case size, and #TJFLAG_NOREALLOC cannot be |
| * used in those cases. |
| * . |
| * If you choose option 1, <tt>dstSizes[i]</tt> should be set to the size of |
| * your pre-allocated buffer. In any case, unless you have set |
| * #TJFLAG_NOREALLOC, you should always check <tt>dstBufs[i]</tt> upon return |
| * from this function, as it may have changed. |
| * |
| * @param dstSizes pointer to an array of n unsigned long variables that will |
| * receive the actual sizes (in bytes) of each transformed JPEG image. If |
| * <tt>dstBufs[i]</tt> points to a pre-allocated buffer, then |
| * <tt>dstSizes[i]</tt> should be set to the size of the buffer. Upon return, |
| * <tt>dstSizes[i]</tt> will contain the size of the JPEG image (in bytes.) |
| * |
| * @param transforms pointer to an array of n #tjtransform structures, each of |
| * which specifies the transform parameters and/or cropping region for the |
| * corresponding transformed output image. |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_ACCURATEDCT |
| * "flags" |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2() |
| * and #tjGetErrorCode().) |
| */ |
| DLLEXPORT int tjTransform(tjhandle handle, const unsigned char *jpegBuf, |
| unsigned long jpegSize, int n, |
| unsigned char **dstBufs, unsigned long *dstSizes, |
| tjtransform *transforms, int flags); |
| |
| |
| /** |
| * Destroy a TurboJPEG compressor, decompressor, or transformer instance. |
| * |
| * @param handle a handle to a TurboJPEG compressor, decompressor or |
| * transformer instance |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2().) |
| */ |
| DLLEXPORT int tjDestroy(tjhandle handle); |
| |
| |
| /** |
| * Allocate an image buffer for use with TurboJPEG. You should always use |
| * this function to allocate the JPEG destination buffer(s) for the compression |
| * and transform functions unless you are disabling automatic buffer |
| * (re)allocation (by setting #TJFLAG_NOREALLOC.) |
| * |
| * @param bytes the number of bytes to allocate |
| * |
| * @return a pointer to a newly-allocated buffer with the specified number of |
| * bytes. |
| * |
| * @sa tjFree() |
| */ |
| DLLEXPORT unsigned char *tjAlloc(int bytes); |
| |
| |
| /** |
| * Load an uncompressed image from disk into memory. |
| * |
| * @param filename name of a file containing an uncompressed image in Windows |
| * BMP or PBMPLUS (PPM/PGM) format |
| * |
| * @param width pointer to an integer variable that will receive the width (in |
| * pixels) of the uncompressed image |
| * |
| * @param align row alignment of the image buffer to be returned (must be a |
| * power of 2.) For instance, setting this parameter to 4 will cause all rows |
| * in the image buffer to be padded to the nearest 32-bit boundary, and setting |
| * this parameter to 1 will cause all rows in the image buffer to be unpadded. |
| * |
| * @param height pointer to an integer variable that will receive the height |
| * (in pixels) of the uncompressed image |
| * |
| * @param pixelFormat pointer to an integer variable that specifies or will |
| * receive the pixel format of the uncompressed image buffer. The behavior of |
| * #tjLoadImage() will vary depending on the value of <tt>*pixelFormat</tt> |
| * passed to the function: |
| * - @ref TJPF_UNKNOWN : The uncompressed image buffer returned by the function |
| * will use the most optimal pixel format for the file type, and |
| * <tt>*pixelFormat</tt> will contain the ID of this pixel format upon |
| * successful return from the function. |
| * - @ref TJPF_GRAY : Only PGM files and 8-bit BMP files with a grayscale |
| * colormap can be loaded. |
| * - @ref TJPF_CMYK : The RGB or grayscale pixels stored in the file will be |
| * converted using a quick & dirty algorithm that is suitable only for testing |
| * purposes (proper conversion between CMYK and other formats requires a color |
| * management system.) |
| * - Other @ref TJPF "pixel formats" : The uncompressed image buffer will use |
| * the specified pixel format, and pixel format conversion will be performed if |
| * necessary. |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_BOTTOMUP |
| * "flags". |
| * |
| * @return a pointer to a newly-allocated buffer containing the uncompressed |
| * image, converted to the chosen pixel format and with the chosen row |
| * alignment, or NULL if an error occurred (see #tjGetErrorStr2().) This |
| * buffer should be freed using #tjFree(). |
| */ |
| DLLEXPORT unsigned char *tjLoadImage(const char *filename, int *width, |
| int align, int *height, int *pixelFormat, |
| int flags); |
| |
| |
| /** |
| * Save an uncompressed image from memory to disk. |
| * |
| * @param filename name of a file to which to save the uncompressed image. |
| * The image will be stored in Windows BMP or PBMPLUS (PPM/PGM) format, |
| * depending on the file extension. |
| * |
| * @param buffer pointer to an image buffer containing RGB, grayscale, or |
| * CMYK pixels to be saved |
| * |
| * @param width width (in pixels) of the uncompressed image |
| * |
| * @param pitch bytes per line in the image buffer. Setting this parameter to |
| * 0 is the equivalent of setting it to |
| * <tt>width * #tjPixelSize[pixelFormat]</tt>. |
| * |
| * @param height height (in pixels) of the uncompressed image |
| * |
| * @param pixelFormat pixel format of the image buffer (see @ref TJPF |
| * "Pixel formats".) If this parameter is set to @ref TJPF_GRAY, then the |
| * image will be stored in PGM or 8-bit (indexed color) BMP format. Otherwise, |
| * the image will be stored in PPM or 24-bit BMP format. If this parameter |
| * is set to @ref TJPF_CMYK, then the CMYK pixels will be converted to RGB |
| * using a quick & dirty algorithm that is suitable only for testing (proper |
| * conversion between CMYK and other formats requires a color management |
| * system.) |
| * |
| * @param flags the bitwise OR of one or more of the @ref TJFLAG_BOTTOMUP |
| * "flags". |
| * |
| * @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr2().) |
| */ |
| DLLEXPORT int tjSaveImage(const char *filename, unsigned char *buffer, |
| int width, int pitch, int height, int pixelFormat, |
| int flags); |
| |
| |
| /** |
| * Free an image buffer previously allocated by TurboJPEG. You should always |
| * use this function to free JPEG destination buffer(s) that were automatically |
| * (re)allocated by the compression and transform functions or that were |
| * manually allocated using #tjAlloc(). |
| * |
| * @param buffer address of the buffer to free. If the address is NULL, then |
| * this function has no effect. |
| * |
| * @sa tjAlloc() |
| */ |
| DLLEXPORT void tjFree(unsigned char *buffer); |
| |
| |
| /** |
| * Returns a descriptive error message explaining why the last command failed. |
| * |
| * @param handle a handle to a TurboJPEG compressor, decompressor, or |
| * transformer instance, or NULL if the error was generated by a global |
| * function (but note that retrieving the error message for a global function |
| * is thread-safe only on platforms that support thread-local storage.) |
| * |
| * @return a descriptive error message explaining why the last command failed. |
| */ |
| DLLEXPORT char *tjGetErrorStr2(tjhandle handle); |
| |
| |
| /** |
| * Returns a code indicating the severity of the last error. See |
| * @ref TJERR "Error codes". |
| * |
| * @param handle a handle to a TurboJPEG compressor, decompressor or |
| * transformer instance |
| * |
| * @return a code indicating the severity of the last error. See |
| * @ref TJERR "Error codes". |
| */ |
| DLLEXPORT int tjGetErrorCode(tjhandle handle); |
| |
| |
| /* Deprecated functions and macros */ |
| #define TJFLAG_FORCEMMX 8 |
| #define TJFLAG_FORCESSE 16 |
| #define TJFLAG_FORCESSE2 32 |
| #define TJFLAG_FORCESSE3 128 |
| |
| |
| /* Backward compatibility functions and macros (nothing to see here) */ |
| #define NUMSUBOPT TJ_NUMSAMP |
| #define TJ_444 TJSAMP_444 |
| #define TJ_422 TJSAMP_422 |
| #define TJ_420 TJSAMP_420 |
| #define TJ_411 TJSAMP_420 |
| #define TJ_GRAYSCALE TJSAMP_GRAY |
| |
| #define TJ_BGR 1 |
| #define TJ_BOTTOMUP TJFLAG_BOTTOMUP |
| #define TJ_FORCEMMX TJFLAG_FORCEMMX |
| #define TJ_FORCESSE TJFLAG_FORCESSE |
| #define TJ_FORCESSE2 TJFLAG_FORCESSE2 |
| #define TJ_ALPHAFIRST 64 |
| #define TJ_FORCESSE3 TJFLAG_FORCESSE3 |
| #define TJ_FASTUPSAMPLE TJFLAG_FASTUPSAMPLE |
| #define TJ_YUV 512 |
| |
| DLLEXPORT unsigned long TJBUFSIZE(int width, int height); |
| |
| DLLEXPORT unsigned long TJBUFSIZEYUV(int width, int height, int jpegSubsamp); |
| |
| DLLEXPORT unsigned long tjBufSizeYUV(int width, int height, int subsamp); |
| |
| DLLEXPORT int tjCompress(tjhandle handle, unsigned char *srcBuf, int width, |
| int pitch, int height, int pixelSize, |
| unsigned char *dstBuf, unsigned long *compressedSize, |
| int jpegSubsamp, int jpegQual, int flags); |
| |
| DLLEXPORT int tjEncodeYUV(tjhandle handle, unsigned char *srcBuf, int width, |
| int pitch, int height, int pixelSize, |
| unsigned char *dstBuf, int subsamp, int flags); |
| |
| DLLEXPORT int tjEncodeYUV2(tjhandle handle, unsigned char *srcBuf, int width, |
| int pitch, int height, int pixelFormat, |
| unsigned char *dstBuf, int subsamp, int flags); |
| |
| DLLEXPORT int tjDecompressHeader(tjhandle handle, unsigned char *jpegBuf, |
| unsigned long jpegSize, int *width, |
| int *height); |
| |
| DLLEXPORT int tjDecompressHeader2(tjhandle handle, unsigned char *jpegBuf, |
| unsigned long jpegSize, int *width, |
| int *height, int *jpegSubsamp); |
| |
| DLLEXPORT int tjDecompress(tjhandle handle, unsigned char *jpegBuf, |
| unsigned long jpegSize, unsigned char *dstBuf, |
| int width, int pitch, int height, int pixelSize, |
| int flags); |
| |
| DLLEXPORT int tjDecompressToYUV(tjhandle handle, unsigned char *jpegBuf, |
| unsigned long jpegSize, unsigned char *dstBuf, |
| int flags); |
| |
| DLLEXPORT char *tjGetErrorStr(void); |
| |
| |
| /** |
| * @} |
| */ |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif |