diff options
Diffstat (limited to 'image/codecs/codec.h')
| -rw-r--r-- | image/codecs/codec.h | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/image/codecs/codec.h b/image/codecs/codec.h index d87758e65e..5c072132d3 100644 --- a/image/codecs/codec.h +++ b/image/codecs/codec.h @@ -59,6 +59,20 @@ public: virtual ~Codec() {} /** + * A type of dithering. + */ + enum DitherType { + /** Unknown */ + kDitherTypeUnknown, + + /** Video for Windows dithering */ + kDitherTypeVFW, + + /** QuickTime dithering */ + kDitherTypeQT + }; + + /** * Decode the frame for the given data and return a pointer to a surface * containing the decoded frame. * @@ -86,6 +100,21 @@ public: * Does the codec have a dirty palette? */ virtual bool hasDirtyPalette() const { return false; } + + /** + * Can the codec dither down to 8bpp? + */ + virtual bool canDither(DitherType type) const { return false; } + + /** + * Activate dithering mode with a palette + */ + virtual void setDither(DitherType type, const byte *palette) {} + + /** + * Create a dither table, as used by QuickTime codecs. + */ + static byte *createQuickTimeDitherTable(const byte *palette, uint colorCount); }; /** |