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357 lines
16 KiB
357 lines
16 KiB
// Copyright 2011 Google Inc. All Rights Reserved. |
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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 to RGB upsampling functions. |
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// |
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// Author: somnath@google.com (Somnath Banerjee) |
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#include "./dsp.h" |
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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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//------------------------------------------------------------------------------ |
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// Fancy upsampler |
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#ifdef FANCY_UPSAMPLING |
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// Fancy upsampling functions to convert YUV to RGB |
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WebPUpsampleLinePairFunc WebPUpsamplers[MODE_LAST]; |
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// Given samples laid out in a square as: |
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// [a b] |
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// [c d] |
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// we interpolate u/v as: |
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// ([9*a + 3*b + 3*c + d 3*a + 9*b + 3*c + d] + [8 8]) / 16 |
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// ([3*a + b + 9*c + 3*d a + 3*b + 3*c + 9*d] [8 8]) / 16 |
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// We process u and v together stashed into 32bit (16bit each). |
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#define LOAD_UV(u,v) ((u) | ((v) << 16)) |
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#define UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \ |
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static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \ |
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const uint8_t* top_u, const uint8_t* top_v, \ |
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const uint8_t* cur_u, const uint8_t* cur_v, \ |
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uint8_t* top_dst, uint8_t* bottom_dst, int len) { \ |
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int x; \ |
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const int last_pixel_pair = (len - 1) >> 1; \ |
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uint32_t tl_uv = LOAD_UV(top_u[0], top_v[0]); /* top-left sample */ \ |
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uint32_t l_uv = LOAD_UV(cur_u[0], cur_v[0]); /* left-sample */ \ |
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if (top_y) { \ |
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const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ |
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FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst); \ |
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} \ |
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if (bottom_y) { \ |
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const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ |
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FUNC(bottom_y[0], uv0 & 0xff, (uv0 >> 16), bottom_dst); \ |
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} \ |
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for (x = 1; x <= last_pixel_pair; ++x) { \ |
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const uint32_t t_uv = LOAD_UV(top_u[x], top_v[x]); /* top sample */ \ |
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const uint32_t uv = LOAD_UV(cur_u[x], cur_v[x]); /* sample */ \ |
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/* precompute invariant values associated with first and second diagonals*/\ |
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const uint32_t avg = tl_uv + t_uv + l_uv + uv + 0x00080008u; \ |
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const uint32_t diag_12 = (avg + 2 * (t_uv + l_uv)) >> 3; \ |
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const uint32_t diag_03 = (avg + 2 * (tl_uv + uv)) >> 3; \ |
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if (top_y) { \ |
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const uint32_t uv0 = (diag_12 + tl_uv) >> 1; \ |
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const uint32_t uv1 = (diag_03 + t_uv) >> 1; \ |
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FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ |
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top_dst + (2 * x - 1) * XSTEP); \ |
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FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16), \ |
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top_dst + (2 * x - 0) * XSTEP); \ |
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} \ |
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if (bottom_y) { \ |
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const uint32_t uv0 = (diag_03 + l_uv) >> 1; \ |
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const uint32_t uv1 = (diag_12 + uv) >> 1; \ |
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FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ |
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bottom_dst + (2 * x - 1) * XSTEP); \ |
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FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16), \ |
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bottom_dst + (2 * x + 0) * XSTEP); \ |
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} \ |
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tl_uv = t_uv; \ |
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l_uv = uv; \ |
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} \ |
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if (!(len & 1)) { \ |
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if (top_y) { \ |
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const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ |
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FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ |
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top_dst + (len - 1) * XSTEP); \ |
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} \ |
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if (bottom_y) { \ |
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const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ |
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FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ |
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bottom_dst + (len - 1) * XSTEP); \ |
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} \ |
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} \ |
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} |
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// All variants implemented. |
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UPSAMPLE_FUNC(UpsampleRgbLinePair, VP8YuvToRgb, 3) |
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UPSAMPLE_FUNC(UpsampleBgrLinePair, VP8YuvToBgr, 3) |
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UPSAMPLE_FUNC(UpsampleRgbaLinePair, VP8YuvToRgba, 4) |
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UPSAMPLE_FUNC(UpsampleBgraLinePair, VP8YuvToBgra, 4) |
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UPSAMPLE_FUNC(UpsampleArgbLinePair, VP8YuvToArgb, 4) |
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UPSAMPLE_FUNC(UpsampleRgba4444LinePair, VP8YuvToRgba4444, 2) |
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UPSAMPLE_FUNC(UpsampleRgb565LinePair, VP8YuvToRgb565, 2) |
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#undef LOAD_UV |
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#undef UPSAMPLE_FUNC |
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#endif // FANCY_UPSAMPLING |
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//------------------------------------------------------------------------------ |
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// simple point-sampling |
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#define SAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \ |
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static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \ |
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const uint8_t* u, const uint8_t* v, \ |
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uint8_t* top_dst, uint8_t* bottom_dst, int len) { \ |
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int i; \ |
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for (i = 0; i < len - 1; i += 2) { \ |
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FUNC(top_y[0], u[0], v[0], top_dst); \ |
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FUNC(top_y[1], u[0], v[0], top_dst + XSTEP); \ |
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FUNC(bottom_y[0], u[0], v[0], bottom_dst); \ |
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FUNC(bottom_y[1], u[0], v[0], bottom_dst + XSTEP); \ |
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top_y += 2; \ |
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bottom_y += 2; \ |
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u++; \ |
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v++; \ |
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top_dst += 2 * XSTEP; \ |
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bottom_dst += 2 * XSTEP; \ |
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} \ |
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if (i == len - 1) { /* last one */ \ |
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FUNC(top_y[0], u[0], v[0], top_dst); \ |
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FUNC(bottom_y[0], u[0], v[0], bottom_dst); \ |
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} \ |
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} |
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// All variants implemented. |
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SAMPLE_FUNC(SampleRgbLinePair, VP8YuvToRgb, 3) |
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SAMPLE_FUNC(SampleBgrLinePair, VP8YuvToBgr, 3) |
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SAMPLE_FUNC(SampleRgbaLinePair, VP8YuvToRgba, 4) |
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SAMPLE_FUNC(SampleBgraLinePair, VP8YuvToBgra, 4) |
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SAMPLE_FUNC(SampleArgbLinePair, VP8YuvToArgb, 4) |
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SAMPLE_FUNC(SampleRgba4444LinePair, VP8YuvToRgba4444, 2) |
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SAMPLE_FUNC(SampleRgb565LinePair, VP8YuvToRgb565, 2) |
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#undef SAMPLE_FUNC |
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const WebPSampleLinePairFunc WebPSamplers[MODE_LAST] = { |
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SampleRgbLinePair, // MODE_RGB |
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SampleRgbaLinePair, // MODE_RGBA |
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SampleBgrLinePair, // MODE_BGR |
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SampleBgraLinePair, // MODE_BGRA |
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SampleArgbLinePair, // MODE_ARGB |
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SampleRgba4444LinePair, // MODE_RGBA_4444 |
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SampleRgb565LinePair, // MODE_RGB_565 |
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SampleRgbaLinePair, // MODE_rgbA |
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SampleBgraLinePair, // MODE_bgrA |
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SampleArgbLinePair, // MODE_Argb |
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SampleRgba4444LinePair // MODE_rgbA_4444 |
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}; |
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//------------------------------------------------------------------------------ |
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#if !defined(FANCY_UPSAMPLING) |
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#define DUAL_SAMPLE_FUNC(FUNC_NAME, FUNC) \ |
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static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bot_y, \ |
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const uint8_t* top_u, const uint8_t* top_v, \ |
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const uint8_t* bot_u, const uint8_t* bot_v, \ |
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uint8_t* top_dst, uint8_t* bot_dst, int len) { \ |
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const int half_len = len >> 1; \ |
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int x; \ |
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if (top_dst != NULL) { \ |
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for (x = 0; x < half_len; ++x) { \ |
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FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x + 0); \ |
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FUNC(top_y[2 * x + 1], top_u[x], top_v[x], top_dst + 8 * x + 4); \ |
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} \ |
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if (len & 1) FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x); \ |
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} \ |
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if (bot_dst != NULL) { \ |
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for (x = 0; x < half_len; ++x) { \ |
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FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x + 0); \ |
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FUNC(bot_y[2 * x + 1], bot_u[x], bot_v[x], bot_dst + 8 * x + 4); \ |
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} \ |
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if (len & 1) FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x); \ |
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} \ |
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} |
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DUAL_SAMPLE_FUNC(DualLineSamplerBGRA, VP8YuvToBgra) |
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DUAL_SAMPLE_FUNC(DualLineSamplerARGB, VP8YuvToArgb) |
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#undef DUAL_SAMPLE_FUNC |
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#endif // !FANCY_UPSAMPLING |
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WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last) { |
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WebPInitUpsamplers(); |
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VP8YUVInit(); |
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#ifdef FANCY_UPSAMPLING |
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return WebPUpsamplers[alpha_is_last ? MODE_BGRA : MODE_ARGB]; |
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#else |
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return (alpha_is_last ? DualLineSamplerBGRA : DualLineSamplerARGB); |
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#endif |
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} |
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//------------------------------------------------------------------------------ |
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// YUV444 converter |
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#define YUV444_FUNC(FUNC_NAME, FUNC, XSTEP) \ |
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static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \ |
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uint8_t* dst, int len) { \ |
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int i; \ |
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for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * XSTEP]); \ |
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} |
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YUV444_FUNC(Yuv444ToRgb, VP8YuvToRgb, 3) |
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YUV444_FUNC(Yuv444ToBgr, VP8YuvToBgr, 3) |
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YUV444_FUNC(Yuv444ToRgba, VP8YuvToRgba, 4) |
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YUV444_FUNC(Yuv444ToBgra, VP8YuvToBgra, 4) |
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YUV444_FUNC(Yuv444ToArgb, VP8YuvToArgb, 4) |
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YUV444_FUNC(Yuv444ToRgba4444, VP8YuvToRgba4444, 2) |
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YUV444_FUNC(Yuv444ToRgb565, VP8YuvToRgb565, 2) |
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#undef YUV444_FUNC |
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const WebPYUV444Converter WebPYUV444Converters[MODE_LAST] = { |
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Yuv444ToRgb, // MODE_RGB |
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Yuv444ToRgba, // MODE_RGBA |
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Yuv444ToBgr, // MODE_BGR |
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Yuv444ToBgra, // MODE_BGRA |
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Yuv444ToArgb, // MODE_ARGB |
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Yuv444ToRgba4444, // MODE_RGBA_4444 |
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Yuv444ToRgb565, // MODE_RGB_565 |
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Yuv444ToRgba, // MODE_rgbA |
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Yuv444ToBgra, // MODE_bgrA |
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Yuv444ToArgb, // MODE_Argb |
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Yuv444ToRgba4444 // MODE_rgbA_4444 |
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}; |
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//------------------------------------------------------------------------------ |
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// Premultiplied modes |
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// non dithered-modes |
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// (x * a * 32897) >> 23 is bit-wise equivalent to (int)(x * a / 255.) |
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// for all 8bit x or a. For bit-wise equivalence to (int)(x * a / 255. + .5), |
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// one can use instead: (x * a * 65793 + (1 << 23)) >> 24 |
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#if 1 // (int)(x * a / 255.) |
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#define MULTIPLIER(a) ((a) * 32897UL) |
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#define PREMULTIPLY(x, m) (((x) * (m)) >> 23) |
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#else // (int)(x * a / 255. + .5) |
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#define MULTIPLIER(a) ((a) * 65793UL) |
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#define PREMULTIPLY(x, m) (((x) * (m) + (1UL << 23)) >> 24) |
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#endif |
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static void ApplyAlphaMultiply(uint8_t* rgba, int alpha_first, |
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int w, int h, int stride) { |
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while (h-- > 0) { |
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uint8_t* const rgb = rgba + (alpha_first ? 1 : 0); |
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const uint8_t* const alpha = rgba + (alpha_first ? 0 : 3); |
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int i; |
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for (i = 0; i < w; ++i) { |
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const uint32_t a = alpha[4 * i]; |
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if (a != 0xff) { |
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const uint32_t mult = MULTIPLIER(a); |
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rgb[4 * i + 0] = PREMULTIPLY(rgb[4 * i + 0], mult); |
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rgb[4 * i + 1] = PREMULTIPLY(rgb[4 * i + 1], mult); |
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rgb[4 * i + 2] = PREMULTIPLY(rgb[4 * i + 2], mult); |
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} |
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} |
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rgba += stride; |
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} |
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} |
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#undef MULTIPLIER |
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#undef PREMULTIPLY |
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// rgbA4444 |
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#define MULTIPLIER(a) ((a) * 0x1111) // 0x1111 ~= (1 << 16) / 15 |
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static WEBP_INLINE uint8_t dither_hi(uint8_t x) { |
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return (x & 0xf0) | (x >> 4); |
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} |
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static WEBP_INLINE uint8_t dither_lo(uint8_t x) { |
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return (x & 0x0f) | (x << 4); |
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} |
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static WEBP_INLINE uint8_t multiply(uint8_t x, uint32_t m) { |
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return (x * m) >> 16; |
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} |
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static void ApplyAlphaMultiply4444(uint8_t* rgba4444, |
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int w, int h, int stride) { |
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while (h-- > 0) { |
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int i; |
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for (i = 0; i < w; ++i) { |
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const uint8_t a = (rgba4444[2 * i + 1] & 0x0f); |
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const uint32_t mult = MULTIPLIER(a); |
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const uint8_t r = multiply(dither_hi(rgba4444[2 * i + 0]), mult); |
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const uint8_t g = multiply(dither_lo(rgba4444[2 * i + 0]), mult); |
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const uint8_t b = multiply(dither_hi(rgba4444[2 * i + 1]), mult); |
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rgba4444[2 * i + 0] = (r & 0xf0) | ((g >> 4) & 0x0f); |
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rgba4444[2 * i + 1] = (b & 0xf0) | a; |
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} |
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rgba4444 += stride; |
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} |
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} |
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#undef MULTIPLIER |
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void (*WebPApplyAlphaMultiply)(uint8_t*, int, int, int, int) |
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= ApplyAlphaMultiply; |
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void (*WebPApplyAlphaMultiply4444)(uint8_t*, int, int, int) |
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= ApplyAlphaMultiply4444; |
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//------------------------------------------------------------------------------ |
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// Main call |
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void WebPInitUpsamplers(void) { |
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#ifdef FANCY_UPSAMPLING |
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WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair; |
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WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair; |
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WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair; |
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WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair; |
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WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair; |
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WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair; |
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WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair; |
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// If defined, use CPUInfo() to overwrite some pointers with faster versions. |
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if (VP8GetCPUInfo != NULL) { |
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#if defined(WEBP_USE_SSE2) |
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if (VP8GetCPUInfo(kSSE2)) { |
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WebPInitUpsamplersSSE2(); |
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} |
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#endif |
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} |
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#endif // FANCY_UPSAMPLING |
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} |
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void WebPInitPremultiply(void) { |
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WebPApplyAlphaMultiply = ApplyAlphaMultiply; |
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WebPApplyAlphaMultiply4444 = ApplyAlphaMultiply4444; |
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#ifdef FANCY_UPSAMPLING |
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WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair; |
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WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair; |
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WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair; |
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WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair; |
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if (VP8GetCPUInfo != NULL) { |
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#if defined(WEBP_USE_SSE2) |
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if (VP8GetCPUInfo(kSSE2)) { |
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WebPInitPremultiplySSE2(); |
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} |
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#endif |
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} |
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#endif // FANCY_UPSAMPLING |
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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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