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add colorspace for premultiplied alpha
The new modes are MODE_rgbA MODE_bgrA MODE_Argb MODE_rgbA_4444 It's binary incompatible, since the enums changed. While at it, i removed the now unneeded KeepAlpha methods. -> Saved ~12k of code! * made explicit mention that alpha_plane is persistent, so we have access to the full alpha plane data at all time. Incremental decoding of alpha was planned for, but not implemented. So better not dragged this constaint for now and make the code easier until we revisit that. Change-Id: Idaba281a6ca819965ca062d1c23329f36d90c7ff
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@ -155,7 +155,6 @@ typedef void (*WebPUpsampleLinePairFunc)(
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// Fancy upsampling functions to convert YUV to RGB(A) modes
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extern WebPUpsampleLinePairFunc WebPUpsamplers[/* MODE_LAST */];
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extern WebPUpsampleLinePairFunc WebPUpsamplersKeepAlpha[/* MODE_LAST */];
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// Initializes SSE2 version of the fancy upsamplers.
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void WebPInitUpsamplersSSE2(void);
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@ -169,7 +168,6 @@ typedef void (*WebPSampleLinePairFunc)(
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uint8_t* top_dst, uint8_t* bottom_dst, int len);
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extern const WebPSampleLinePairFunc WebPSamplers[/* MODE_LAST */];
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extern const WebPSampleLinePairFunc WebPSamplersKeepAlpha[/* MODE_LAST */];
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// YUV444->RGB converters
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typedef void (*WebPYUV444Converter)(const uint8_t* y,
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@ -181,6 +179,23 @@ extern const WebPYUV444Converter WebPYUV444Converters[/* MODE_LAST */];
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// Main function to be called
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void WebPInitUpsamplers(void);
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//------------------------------------------------------------------------------
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// Pre-multiply planes with alpha values
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// Apply alpha pre-multiply on an rgba, bgra or argb plane of size w * h.
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// alpha_first should be 0 for argb, 1 for rgba or bgra (where alpha is last).
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extern void (*WebPApplyAlphaMultiply)(
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uint8_t* rgba, int alpha_first, int w, int h, int stride);
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// Same, buf specifically for RGBA4444 format
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extern void (*WebPApplyAlphaMultiply4444)(
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uint8_t* rgba4444, int w, int h, int stride);
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// To be called first before using the above.
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void WebPInitPremultiply(void);
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void WebPInitPremultiplySSE2(void); // should not be called directly.
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//------------------------------------------------------------------------------
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#if defined(__cplusplus) || defined(c_plusplus)
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