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add support for RGB565, ARGB4444 and ARGB colorspace (decoder)

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RGB565 and ARGB4444 are only supported through the advanced decoding API.
ARGB being somewhat generic, there's an easy WebPDecodeARGB()
new function for convenience.

Patch by Vikas Arora (vikaas dot arora at gmail dot com)

Change-Id: Ic7b6f72bd70aca458d14e7fdd23679212430ebca
This commit is contained in:
Pascal Massimino
2011-07-13 09:08:58 -07:00
parent c915fb2aa7
commit 19db59f80f
7 changed files with 123 additions and 45 deletions
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10
src/webp/decode.h
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@ -42,6 +42,10 @@ uint8_t* WebPDecodeRGB(const uint8_t* data, uint32_t data_size,
uint8_t* WebPDecodeRGBA(const uint8_t* data, uint32_t data_size,
int* width, int* height);
// Same as WebPDecodeRGBA, but returning ARGB data.
uint8_t* WebPDecodeARGB(const uint8_t* data, uint32_t data_size,
int* width, int* height);
// This variant decode to BGR instead of RGB.
uint8_t* WebPDecodeBGR(const uint8_t* data, uint32_t data_size,
int* width, int* height);
@ -102,7 +106,11 @@ uint8_t* WebPDecodeYUVInto(const uint8_t* data, uint32_t data_size,
// Colorspaces
typedef enum { MODE_RGB = 0, MODE_RGBA = 1,
MODE_BGR = 2, MODE_BGRA = 3,
MODE_YUV = 4, MODE_YUVA = 5 // yuv 4:2:0
MODE_ARGB = 4, MODE_ARGB_4444 = 5,
MODE_RGB_565 = 6,
// YUV modes must come after RGB ones.
MODE_YUV = 7, MODE_YUVA = 8, // yuv 4:2:0
MODE_LAST = 9
} WEBP_CSP_MODE;
// Generic structure for describing the sample buffer.