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https://github.com/webmproject/libwebp.git
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f8db5d5d1c
going down to strict -ansi c89 is quite overkill (no 'inline', and /* */-style comments). But with these fixes, the code compiles with the stringent flags: -Wextra -Wold-style-definition -Wmissing-prototypes -Wmissing-declarations and -Wdeclaration-after-statement Change-Id: I36222f8f505bcba3d9d1309ad98b5ccb04ec17e3
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
// Copyright 2010 Google Inc.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// YUV->RGB conversion function
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include "yuv.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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enum { YUV_HALF = 1 << (YUV_FIX - 1) };
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int16_t VP8kVToR[256], VP8kUToB[256];
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int32_t VP8kVToG[256], VP8kUToG[256];
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uint8_t VP8kClip[YUV_RANGE_MAX - YUV_RANGE_MIN];
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static int done = 0;
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void VP8YUVInit(void) {
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int i;
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if (done) {
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return;
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}
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for (i = 0; i < 256; ++i) {
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VP8kVToR[i] = (89858 * (i - 128) + YUV_HALF) >> YUV_FIX;
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VP8kUToG[i] = -22014 * (i - 128) + YUV_HALF;
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VP8kVToG[i] = -45773 * (i - 128);
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VP8kUToB[i] = (113618 * (i - 128) + YUV_HALF) >> YUV_FIX;
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}
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for (i = YUV_RANGE_MIN; i < YUV_RANGE_MAX; ++i) {
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const int k = ((i - 16) * 76283 + YUV_HALF) >> YUV_FIX;
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VP8kClip[i - YUV_RANGE_MIN] = (k < 0) ? 0 : (k > 255) ? 255 : k;
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}
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done = 1;
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}
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#if defined(__cplusplus) || defined(c_plusplus)
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} // extern "C"
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#endif
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