| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkImageInfo_DEFINED |
| #define SkImageInfo_DEFINED |
| |
| #include "SkTypes.h" |
| |
| class SkFlattenableWriteBuffer; |
| class SkFlattenableReadBuffer; |
| |
| /** |
| * Describes how to interpret the alpha compoent of a pixel. |
| */ |
| enum SkAlphaType { |
| /** |
| * All pixels should be treated as opaque, regardless of the value stored |
| * in their alpha field. Used for legacy images that wrote 0 or garbarge |
| * in their alpha field, but intended the RGB to be treated as opaque. |
| */ |
| kIgnore_SkAlphaType, |
| |
| /** |
| * All pixels are stored as opaque. This differs slightly from kIgnore in |
| * that kOpaque has correct "opaque" values stored in the pixels, while |
| * kIgnore may not, but in both cases the caller should treat the pixels |
| * as opaque. |
| */ |
| kOpaque_SkAlphaType, |
| |
| /** |
| * All pixels have their alpha premultiplied in their color components. |
| * This is the natural format for the rendering target pixels. |
| */ |
| kPremul_SkAlphaType, |
| |
| /** |
| * All pixels have their color components stored without any regard to the |
| * alpha. e.g. this is the default configuration for PNG images. |
| * |
| * This alpha-type is ONLY supported for input images. Rendering cannot |
| * generate this on output. |
| */ |
| kUnpremul_SkAlphaType, |
| |
| kLastEnum_SkAlphaType = kUnpremul_SkAlphaType |
| }; |
| |
| static inline bool SkAlphaTypeIsOpaque(SkAlphaType at) { |
| SK_COMPILE_ASSERT(kIgnore_SkAlphaType < kOpaque_SkAlphaType, bad_alphatype_order); |
| SK_COMPILE_ASSERT(kPremul_SkAlphaType > kOpaque_SkAlphaType, bad_alphatype_order); |
| SK_COMPILE_ASSERT(kUnpremul_SkAlphaType > kOpaque_SkAlphaType, bad_alphatype_order); |
| |
| return (unsigned)at <= kOpaque_SkAlphaType; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| /** |
| * Describes how to interpret the components of a pixel. |
| */ |
| enum SkColorType { |
| kAlpha_8_SkColorType, |
| kRGB_565_SkColorType, |
| kARGB_4444_SkColorType, |
| kRGBA_8888_SkColorType, |
| kBGRA_8888_SkColorType, |
| kIndex_8_SkColorType, |
| |
| kLastEnum_SkColorType = kIndex_8_SkColorType, |
| |
| #if SK_PMCOLOR_BYTE_ORDER(B,G,R,A) |
| kPMColor_SkColorType = kBGRA_8888_SkColorType |
| #elif SK_PMCOLOR_BYTE_ORDER(R,G,B,A) |
| kPMColor_SkColorType = kRGBA_8888_SkColorType |
| #else |
| #error "SK_*32_SHFIT values must correspond to BGRA or RGBA byte order" |
| #endif |
| }; |
| |
| static int SkColorTypeBytesPerPixel(SkColorType ct) { |
| static const uint8_t gSize[] = { |
| 1, // Alpha_8 |
| 2, // RGB_565 |
| 2, // ARGB_4444 |
| 4, // RGBA_8888 |
| 4, // BGRA_8888 |
| 1, // kIndex_8 |
| }; |
| SK_COMPILE_ASSERT(SK_ARRAY_COUNT(gSize) == (size_t)(kLastEnum_SkColorType + 1), |
| size_mismatch_with_SkColorType_enum); |
| |
| SkASSERT((size_t)ct < SK_ARRAY_COUNT(gSize)); |
| return gSize[ct]; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| /** |
| * Describe an image's dimensions and pixel type. |
| */ |
| struct SkImageInfo { |
| int fWidth; |
| int fHeight; |
| SkColorType fColorType; |
| SkAlphaType fAlphaType; |
| |
| bool isOpaque() const { |
| return SkAlphaTypeIsOpaque(fAlphaType); |
| } |
| |
| int bytesPerPixel() const { |
| return SkColorTypeBytesPerPixel(fColorType); |
| } |
| |
| size_t minRowBytes() const { |
| return fWidth * this->bytesPerPixel(); |
| } |
| |
| bool operator==(const SkImageInfo& other) const { |
| return 0 == memcmp(this, &other, sizeof(other)); |
| } |
| bool operator!=(const SkImageInfo& other) const { |
| return 0 != memcmp(this, &other, sizeof(other)); |
| } |
| |
| void unflatten(SkFlattenableReadBuffer&); |
| void flatten(SkFlattenableWriteBuffer&) const; |
| |
| size_t getSafeSize(size_t rowBytes) const { |
| if (0 == fHeight) { |
| return 0; |
| } |
| return (fHeight - 1) * rowBytes + fWidth * this->bytesPerPixel(); |
| } |
| }; |
| |
| #endif |