| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkTextureCompressor_DEFINED |
| #define SkTextureCompressor_DEFINED |
| |
| #include "SkImageInfo.h" |
| #include "SkBlitter.h" |
| |
| class SkBitmap; |
| class SkData; |
| |
| namespace SkTextureCompressor { |
| // Various texture compression formats that we support. |
| enum Format { |
| // Alpha only formats. |
| kLATC_Format, // 4x4 blocks, compresses A8 |
| kR11_EAC_Format, // 4x4 blocks, compresses A8 |
| |
| kLast_Format = kR11_EAC_Format |
| }; |
| static const int kFormatCnt = kLast_Format + 1; |
| |
| // Returns the size of the compressed data given the width, height, and |
| // desired compression format. If the width and height are not an appropriate |
| // multiple of the block size, then this function returns an error (-1). |
| int GetCompressedDataSize(Format fmt, int width, int height); |
| |
| // Returns an SkData holding a blob of compressed data that corresponds |
| // to the bitmap. If the bitmap colorType cannot be compressed using the |
| // associated format, then we return NULL. The caller is responsible for |
| // calling unref() on the returned data. |
| SkData* CompressBitmapToFormat(const SkBitmap& bitmap, Format format); |
| |
| // Compresses the given src data into dst. The src data is assumed to be |
| // large enough to hold width*height pixels. The dst data is expected to |
| // be large enough to hold the compressed data according to the format. |
| bool CompressBufferToFormat(uint8_t* dst, const uint8_t* src, SkColorType srcColorType, |
| int width, int height, int rowBytes, Format format, |
| bool opt = true /* Use optimization if available */); |
| |
| // This typedef defines what the nominal aspects of a compression function |
| // are. The typedef is not meant to be used by clients of the API, but rather |
| // allows SIMD optimized compression functions to be implemented. |
| typedef bool (*CompressionProc)(uint8_t* dst, const uint8_t* src, |
| int width, int height, int rowBytes); |
| |
| // Returns the blitter for the given compression format. Note, the blitter |
| // is intended to be used with the proper input. I.e. if you try to blit |
| // RGB source data into an R11 EAC texture, you're gonna have a bad time. |
| SkBlitter* CreateBlitterForFormat(int width, int height, void* compressedBuffer, |
| Format format); |
| } |
| |
| #endif |