// Copyright 2014 Google Inc. All Rights Reserved. // // Use of this source code is governed by a BSD-style license // that can be found in the COPYING file in the root of the source // tree. An additional intellectual property rights grant can be found // in the file PATENTS. All contributing project authors may // be found in the AUTHORS file in the root of the source tree. // ----------------------------------------------------------------------------- // // YUV to RGB upsampling functions. // // Author(s): Branimir Vasic (branimir.vasic@imgtec.com) // Djordje Pesut (djordje.pesut@imgtec.com) #include "src/dsp/dsp.h" #if defined(WEBP_USE_MIPS_DSP_R2) #include #include "src/dsp/yuv.h" #define YUV_TO_RGB(Y, U, V, R, G, B) do { \ const int t1 = MultHi(Y, 19077); \ const int t2 = MultHi(V, 13320); \ R = MultHi(V, 26149); \ G = MultHi(U, 6419); \ B = MultHi(U, 33050); \ R = t1 + R; \ G = t1 - G; \ B = t1 + B; \ R = R - 14234; \ G = G - t2 + 8708; \ B = B - 17685; \ __asm__ volatile ( \ "shll_s.w %[" #R "], %[" #R "], 17 \n\t" \ "shll_s.w %[" #G "], %[" #G "], 17 \n\t" \ "shll_s.w %[" #B "], %[" #B "], 17 \n\t" \ "precrqu_s.qb.ph %[" #R "], %[" #R "], $zero \n\t" \ "precrqu_s.qb.ph %[" #G "], %[" #G "], $zero \n\t" \ "precrqu_s.qb.ph %[" #B "], %[" #B "], $zero \n\t" \ "srl %[" #R "], %[" #R "], 24 \n\t" \ "srl %[" #G "], %[" #G "], 24 \n\t" \ "srl %[" #B "], %[" #B "], 24 \n\t" \ : [R]"+r"(R), [G]"+r"(G), [B]"+r"(B) \ : \ ); \ } while (0) #if !defined(WEBP_REDUCE_CSP) static WEBP_INLINE void YuvToRgb(int y, int u, int v, uint8_t* const rgb) { int r, g, b; YUV_TO_RGB(y, u, v, r, g, b); rgb[0] = r; rgb[1] = g; rgb[2] = b; } static WEBP_INLINE void YuvToBgr(int y, int u, int v, uint8_t* const bgr) { int r, g, b; YUV_TO_RGB(y, u, v, r, g, b); bgr[0] = b; bgr[1] = g; bgr[2] = r; } static WEBP_INLINE void YuvToRgb565(int y, int u, int v, uint8_t* const rgb) { int r, g, b; YUV_TO_RGB(y, u, v, r, g, b); { const int rg = (r & 0xf8) | (g >> 5); const int gb = ((g << 3) & 0xe0) | (b >> 3); #if (WEBP_SWAP_16BIT_CSP == 1) rgb[0] = gb; rgb[1] = rg; #else rgb[0] = rg; rgb[1] = gb; #endif } } static WEBP_INLINE void YuvToRgba4444(int y, int u, int v, uint8_t* const argb) { int r, g, b; YUV_TO_RGB(y, u, v, r, g, b); { const int rg = (r & 0xf0) | (g >> 4); const int ba = (b & 0xf0) | 0x0f; // overwrite the lower 4 bits #if (WEBP_SWAP_16BIT_CSP == 1) argb[0] = ba; argb[1] = rg; #else argb[0] = rg; argb[1] = ba; #endif } } #endif // WEBP_REDUCE_CSP //----------------------------------------------------------------------------- // Alpha handling variants #if !defined(WEBP_REDUCE_CSP) static WEBP_INLINE void YuvToArgb(uint8_t y, uint8_t u, uint8_t v, uint8_t* const argb) { int r, g, b; YUV_TO_RGB(y, u, v, r, g, b); argb[0] = 0xff; argb[1] = r; argb[2] = g; argb[3] = b; } #endif // WEBP_REDUCE_CSP static WEBP_INLINE void YuvToBgra(uint8_t y, uint8_t u, uint8_t v, uint8_t* const bgra) { int r, g, b; YUV_TO_RGB(y, u, v, r, g, b); bgra[0] = b; bgra[1] = g; bgra[2] = r; bgra[3] = 0xff; } static WEBP_INLINE void YuvToRgba(uint8_t y, uint8_t u, uint8_t v, uint8_t* const rgba) { int r, g, b; YUV_TO_RGB(y, u, v, r, g, b); rgba[0] = r; rgba[1] = g; rgba[2] = b; rgba[3] = 0xff; } //------------------------------------------------------------------------------ // Fancy upsampler #ifdef FANCY_UPSAMPLING // Given samples laid out in a square as: // [a b] // [c d] // we interpolate u/v as: // ([9*a + 3*b + 3*c + d 3*a + 9*b + 3*c + d] + [8 8]) / 16 // ([3*a + b + 9*c + 3*d a + 3*b + 3*c + 9*d] [8 8]) / 16 // We process u and v together stashed into 32bit (16bit each). #define LOAD_UV(u, v) ((u) | ((v) << 16)) #define UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \ static void FUNC_NAME(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) { \ int x; \ const int last_pixel_pair = (len - 1) >> 1; \ uint32_t tl_uv = LOAD_UV(top_u[0], top_v[0]); /* top-left sample */ \ uint32_t l_uv = LOAD_UV(cur_u[0], cur_v[0]); /* left-sample */ \ assert(top_y != NULL); \ { \ const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst); \ } \ if (bottom_y != NULL) { \ const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ FUNC(bottom_y[0], uv0 & 0xff, (uv0 >> 16), bottom_dst); \ } \ for (x = 1; x <= last_pixel_pair; ++x) { \ const uint32_t t_uv = LOAD_UV(top_u[x], top_v[x]); /* top sample */ \ const uint32_t uv = LOAD_UV(cur_u[x], cur_v[x]); /* sample */ \ /* precompute invariant values associated with first and second diagonals*/\ const uint32_t avg = tl_uv + t_uv + l_uv + uv + 0x00080008u; \ const uint32_t diag_12 = (avg + 2 * (t_uv + l_uv)) >> 3; \ const uint32_t diag_03 = (avg + 2 * (tl_uv + uv)) >> 3; \ { \ const uint32_t uv0 = (diag_12 + tl_uv) >> 1; \ const uint32_t uv1 = (diag_03 + t_uv) >> 1; \ FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ top_dst + (2 * x - 1) * XSTEP); \ FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16), \ top_dst + (2 * x - 0) * XSTEP); \ } \ if (bottom_y != NULL) { \ const uint32_t uv0 = (diag_03 + l_uv) >> 1; \ const uint32_t uv1 = (diag_12 + uv) >> 1; \ FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ bottom_dst + (2 * x - 1) * XSTEP); \ FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16), \ bottom_dst + (2 * x + 0) * XSTEP); \ } \ tl_uv = t_uv; \ l_uv = uv; \ } \ if (!(len & 1)) { \ { \ const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ top_dst + (len - 1) * XSTEP); \ } \ if (bottom_y != NULL) { \ const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ bottom_dst + (len - 1) * XSTEP); \ } \ } \ } // All variants implemented. UPSAMPLE_FUNC(UpsampleRgbaLinePair, YuvToRgba, 4) UPSAMPLE_FUNC(UpsampleBgraLinePair, YuvToBgra, 4) #if !defined(WEBP_REDUCE_CSP) UPSAMPLE_FUNC(UpsampleRgbLinePair, YuvToRgb, 3) UPSAMPLE_FUNC(UpsampleBgrLinePair, YuvToBgr, 3) UPSAMPLE_FUNC(UpsampleArgbLinePair, YuvToArgb, 4) UPSAMPLE_FUNC(UpsampleRgba4444LinePair, YuvToRgba4444, 2) UPSAMPLE_FUNC(UpsampleRgb565LinePair, YuvToRgb565, 2) #endif // WEBP_REDUCE_CSP #undef LOAD_UV #undef UPSAMPLE_FUNC //------------------------------------------------------------------------------ // Entry point extern void WebPInitUpsamplersMIPSdspR2(void); WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersMIPSdspR2(void) { WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair; WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair; WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair; WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair; #if !defined(WEBP_REDUCE_CSP) WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair; WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair; WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair; WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair; WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair; WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair; WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair; #endif // WEBP_REDUCE_CSP } #endif // FANCY_UPSAMPLING //------------------------------------------------------------------------------ // YUV444 converter #define YUV444_FUNC(FUNC_NAME, FUNC, XSTEP) \ static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \ uint8_t* dst, int len) { \ int i; \ for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * XSTEP]); \ } YUV444_FUNC(Yuv444ToRgba, YuvToRgba, 4) YUV444_FUNC(Yuv444ToBgra, YuvToBgra, 4) #if !defined(WEBP_REDUCE_CSP) YUV444_FUNC(Yuv444ToRgb, YuvToRgb, 3) YUV444_FUNC(Yuv444ToBgr, YuvToBgr, 3) YUV444_FUNC(Yuv444ToArgb, YuvToArgb, 4) YUV444_FUNC(Yuv444ToRgba4444, YuvToRgba4444, 2) YUV444_FUNC(Yuv444ToRgb565, YuvToRgb565, 2) #endif // WEBP_REDUCE_CSP #undef YUV444_FUNC //------------------------------------------------------------------------------ // Entry point extern void WebPInitYUV444ConvertersMIPSdspR2(void); WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersMIPSdspR2(void) { WebPYUV444Converters[MODE_RGBA] = Yuv444ToRgba; WebPYUV444Converters[MODE_BGRA] = Yuv444ToBgra; WebPYUV444Converters[MODE_rgbA] = Yuv444ToRgba; WebPYUV444Converters[MODE_bgrA] = Yuv444ToBgra; #if !defined(WEBP_REDUCE_CSP) WebPYUV444Converters[MODE_RGB] = Yuv444ToRgb; WebPYUV444Converters[MODE_BGR] = Yuv444ToBgr; WebPYUV444Converters[MODE_ARGB] = Yuv444ToArgb; WebPYUV444Converters[MODE_RGBA_4444] = Yuv444ToRgba4444; WebPYUV444Converters[MODE_RGB_565] = Yuv444ToRgb565; WebPYUV444Converters[MODE_Argb] = Yuv444ToArgb; WebPYUV444Converters[MODE_rgbA_4444] = Yuv444ToRgba4444; #endif // WEBP_REDUCE_CSP } #else // !WEBP_USE_MIPS_DSP_R2 WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersMIPSdspR2) #endif // WEBP_USE_MIPS_DSP_R2 #if !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_MIPS_DSP_R2)) WEBP_DSP_INIT_STUB(WebPInitUpsamplersMIPSdspR2) #endif