370 lines
16 KiB
C
370 lines
16 KiB
C
// Copyright 2011 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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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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#if defined(WEBP_USE_NEON)
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if (VP8GetCPUInfo(kNEON)) {
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WebPInitUpsamplersNEON();
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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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#if defined(WEBP_USE_NEON)
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if (VP8GetCPUInfo(kNEON)) {
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WebPInitPremultiplyNEON();
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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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