diff options
Diffstat (limited to 'chromium/ui/gfx/codec/png_codec.h')
| -rw-r--r-- | chromium/ui/gfx/codec/png_codec.h | 21 |
1 files changed, 16 insertions, 5 deletions
diff --git a/chromium/ui/gfx/codec/png_codec.h b/chromium/ui/gfx/codec/png_codec.h index abb3eaab32c..5f849c462fc 100644 --- a/chromium/ui/gfx/codec/png_codec.h +++ b/chromium/ui/gfx/codec/png_codec.h @@ -37,8 +37,10 @@ class GFX_EXPORT PNGCodec { // This is the default Windows DIB order. FORMAT_BGRA, - // 4 bytes per pixel, in pre-multiplied kARGB_8888_Config format. For use - // with directly writing to a skia bitmap. + // SkBitmap format. For Encode() kARGB_8888_Config (4 bytes per pixel) and + // kA8_Config (1 byte per pixel) formats are supported. kA8_Config gets + // encoded into a grayscale PNG treating alpha as the color intensity. + // For Decode() kARGB_8888_Config is always used. FORMAT_SkBitmap }; @@ -77,9 +79,10 @@ class GFX_EXPORT PNGCodec { std::vector<unsigned char>* output); // Call PNGCodec::Encode on the supplied SkBitmap |input|, which is assumed - // to be BGRA, 32 bits per pixel. The params |discard_transparency| and - // |output| are passed directly to Encode; refer to Encode for more - // information. During the call, an SkAutoLockPixels lock is held on |input|. + // to be kARGB_8888_Config, 32 bits per pixel. The params + // |discard_transparency| and |output| are passed directly to Encode; refer to + // Encode for more information. During the call, an SkAutoLockPixels lock + // is held on |input|. static bool EncodeBGRASkBitmap(const SkBitmap& input, bool discard_transparency, std::vector<unsigned char>* output); @@ -91,6 +94,14 @@ class GFX_EXPORT PNGCodec { bool discard_transparency, std::vector<unsigned char>* output); + // Call PNGCodec::Encode on the supplied SkBitmap |input|, which is assumed + // to be kA8_Config, 8 bits per pixel. The bitmap is encoded as a grayscale + // PNG with alpha used for color intensity. The |output| param is passed + // directly to Encode; refer to Encode for more information. During the call, + // an SkAutoLockPixels lock is held on |input|. + static bool EncodeA8SkBitmap(const SkBitmap& input, + std::vector<unsigned char>* output); + // Decodes the PNG data contained in input of length input_size. The // decoded data will be placed in *output with the dimensions in *w and *h // on success (returns true). This data will be written in the 'format' |