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add automatic YUVA/ARGB conversion during WebPEncode()

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Adds new methods WebPPictureARGBToYUVA() and WebPPictureYUVAToARGB()
Depending on the value of picture->use_argb_input,
the main call WebPEncode() will convert appropriately.
Note that both conversions are lossy, so it's recommended to:
* use YUVA input for lossy compression (picture->use_argb_input=0)
* use ARGB input for lossless compression (picture->use_argb_input=1)

Change-Id: I8269d607723ee8a1136b9f4999f7ff4e657bbb04
This commit is contained in:
Pascal Massimino
2012-06-28 00:34:23 -07:00
parent 802e012a18
commit fcc69923b9
5 changed files with 378 additions and 137 deletions
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7
src/dsp/dsp.h
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@ -145,13 +145,13 @@ void VP8DspInit(void);
#define FANCY_UPSAMPLING // undefined to remove fancy upsampling support
#ifdef FANCY_UPSAMPLING
typedef void (*WebPUpsampleLinePairFunc)(
const uint8_t* top_y, const uint8_t* bottom_y,
const uint8_t* top_u, const uint8_t* top_v,
const uint8_t* cur_u, const uint8_t* cur_v,
uint8_t* top_dst, uint8_t* bottom_dst, int len);
#ifdef FANCY_UPSAMPLING
// Fancy upsampling functions to convert YUV to RGB(A) modes
extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
@ -169,6 +169,11 @@ typedef void (*WebPSampleLinePairFunc)(
extern const WebPSampleLinePairFunc WebPSamplers[/* MODE_LAST */];
// General function for converting two lines of ARGB or RGBA.
// 'alpha_is_last' should be true if 0xff000000 is stored in memory as
// as 0x00, 0x00, 0x00, 0xff (little endian).
WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last);
// YUV444->RGB converters
typedef void (*WebPYUV444Converter)(const uint8_t* y,
const uint8_t* u, const uint8_t* v,