1af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// Copyright 2014 Google Inc. All Rights Reserved. 2af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// 3af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// Use of this source code is governed by a BSD-style license 4af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// that can be found in the COPYING file in the root of the source 5af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// tree. An additional intellectual property rights grant can be found 6af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// in the file PATENTS. All contributing project authors may 7af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// be found in the AUTHORS file in the root of the source tree. 8af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// ----------------------------------------------------------------------------- 9af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// 10af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// WebPPicture utils for colorspace conversion 11af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// 12af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// Author: Skal (pascal.massimino@gmail.com) 13af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 14af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#include <assert.h> 15af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#include <stdlib.h> 16af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#include <math.h> 17af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 18af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#include "./vp8enci.h" 19af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#include "../utils/random.h" 20af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#include "../dsp/yuv.h" 21af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 22af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// Uncomment to disable gamma-compression during RGB->U/V averaging 23af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define USE_GAMMA_COMPRESSION 24af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 25af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic const union { 26af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora uint32_t argb; 27af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora uint8_t bytes[4]; 28af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} test_endian = { 0xff000000u }; 29af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define ALPHA_IS_LAST (test_endian.bytes[3] == 0xff) 30af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 31af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic WEBP_INLINE uint32_t MakeARGB32(int a, int r, int g, int b) { 32af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return (((uint32_t)a << 24) | (r << 16) | (g << 8) | b); 33af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 34af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 35af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora//------------------------------------------------------------------------------ 36af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// Detection of non-trivial transparency 37af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 38af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// Returns true if alpha[] has non-0xff values. 39af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic int CheckNonOpaque(const uint8_t* alpha, int width, int height, 40af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int x_step, int y_step) { 41af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (alpha == NULL) return 0; 42af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora while (height-- > 0) { 43af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int x; 44af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (x = 0; x < width * x_step; x += x_step) { 45af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (alpha[x] != 0xff) return 1; // TODO(skal): check 4/8 bytes at a time. 46af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 47af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora alpha += y_step; 48af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 49af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return 0; 50af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 51af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 52af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// Checking for the presence of non-opaque alpha. 53af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Aroraint WebPPictureHasTransparency(const WebPPicture* picture) { 54af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (picture == NULL) return 0; 55af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (!picture->use_argb) { 56af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return CheckNonOpaque(picture->a, picture->width, picture->height, 57af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 1, picture->a_stride); 58af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } else { 59af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int x, y; 60af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint32_t* argb = picture->argb; 61af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (argb == NULL) return 0; 62af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (y = 0; y < picture->height; ++y) { 63af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (x = 0; x < picture->width; ++x) { 64af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (argb[x] < 0xff000000u) return 1; // test any alpha values != 0xff 65af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 66af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora argb += picture->argb_stride; 67af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 68af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 69af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return 0; 70af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 71af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 72af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora//------------------------------------------------------------------------------ 73af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// RGB -> YUV conversion 74af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 75af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic int RGBToY(int r, int g, int b, VP8Random* const rg) { 76af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return VP8RGBToY(r, g, b, VP8RandomBits(rg, YUV_FIX)); 77af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 78af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 79af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic int RGBToU(int r, int g, int b, VP8Random* const rg) { 80af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return VP8RGBToU(r, g, b, VP8RandomBits(rg, YUV_FIX + 2)); 81af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 82af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 83af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic int RGBToV(int r, int g, int b, VP8Random* const rg) { 84af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return VP8RGBToV(r, g, b, VP8RandomBits(rg, YUV_FIX + 2)); 85af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 86af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 87af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora//------------------------------------------------------------------------------ 88af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 89af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#if defined(USE_GAMMA_COMPRESSION) 90af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 91af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// gamma-compensates loss of resolution during chroma subsampling 92af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define kGamma 0.80 93af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define kGammaFix 12 // fixed-point precision for linear values 94af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define kGammaScale ((1 << kGammaFix) - 1) 95af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define kGammaTabFix 7 // fixed-point fractional bits precision 96af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define kGammaTabScale (1 << kGammaTabFix) 97af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define kGammaTabRounder (kGammaTabScale >> 1) 98af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define kGammaTabSize (1 << (kGammaFix - kGammaTabFix)) 99af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 100af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic int kLinearToGammaTab[kGammaTabSize + 1]; 101af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic uint16_t kGammaToLinearTab[256]; 102af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic int kGammaTablesOk = 0; 103af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 104af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic void InitGammaTables(void) { 105af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (!kGammaTablesOk) { 106af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int v; 107af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const double scale = 1. / kGammaScale; 108af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (v = 0; v <= 255; ++v) { 109af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora kGammaToLinearTab[v] = 110af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora (uint16_t)(pow(v / 255., kGamma) * kGammaScale + .5); 111af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 112af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (v = 0; v <= kGammaTabSize; ++v) { 113af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const double x = scale * (v << kGammaTabFix); 114af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora kLinearToGammaTab[v] = (int)(pow(x, 1. / kGamma) * 255. + .5); 115af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 116af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora kGammaTablesOk = 1; 117af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 118af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 119af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 120af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic WEBP_INLINE uint32_t GammaToLinear(uint8_t v) { 121af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return kGammaToLinearTab[v]; 122af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 123af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 124af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// Convert a linear value 'v' to YUV_FIX+2 fixed-point precision 125af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// U/V value, suitable for RGBToU/V calls. 126af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic WEBP_INLINE int LinearToGamma(uint32_t base_value, int shift) { 127af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int v = base_value << shift; // final uplifted value 128af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int tab_pos = v >> (kGammaTabFix + 2); // integer part 129af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int x = v & ((kGammaTabScale << 2) - 1); // fractional part 130af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int v0 = kLinearToGammaTab[tab_pos]; 131af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int v1 = kLinearToGammaTab[tab_pos + 1]; 132af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int y = v1 * x + v0 * ((kGammaTabScale << 2) - x); // interpolate 133af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return (y + kGammaTabRounder) >> kGammaTabFix; // descale 134af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 135af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 136af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#else 137af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 138af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic void InitGammaTables(void) {} 139af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic WEBP_INLINE uint32_t GammaToLinear(uint8_t v) { return v; } 140af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic WEBP_INLINE int LinearToGamma(uint32_t base_value, int shift) { 141af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return (int)(base_value << shift); 142af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 143af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 144af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#endif // USE_GAMMA_COMPRESSION 145af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 146af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora//------------------------------------------------------------------------------ 147af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 148af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define SUM4(ptr) LinearToGamma( \ 149af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora GammaToLinear((ptr)[0]) + \ 150af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora GammaToLinear((ptr)[step]) + \ 151af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora GammaToLinear((ptr)[rgb_stride]) + \ 152af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora GammaToLinear((ptr)[rgb_stride + step]), 0) \ 153af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 154af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define SUM2H(ptr) \ 155af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora LinearToGamma(GammaToLinear((ptr)[0]) + GammaToLinear((ptr)[step]), 1) 156af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define SUM2V(ptr) \ 157af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora LinearToGamma(GammaToLinear((ptr)[0]) + GammaToLinear((ptr)[rgb_stride]), 1) 158af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define SUM1(ptr) \ 159af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora LinearToGamma(GammaToLinear((ptr)[0]), 2) 160af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 161af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#define RGB_TO_UV(x, y, SUM) { \ 162af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int src = (2 * (step * (x) + (y) * rgb_stride)); \ 163af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int dst = (x) + (y) * picture->uv_stride; \ 164af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int r = SUM(r_ptr + src); \ 165af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int g = SUM(g_ptr + src); \ 166af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int b = SUM(b_ptr + src); \ 167af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora picture->u[dst] = RGBToU(r, g, b, &rg); \ 168af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora picture->v[dst] = RGBToV(r, g, b, &rg); \ 169af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 170af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 171af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic int ImportYUVAFromRGBA(const uint8_t* const r_ptr, 172af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const g_ptr, 173af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const b_ptr, 174af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const a_ptr, 175af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int step, // bytes per pixel 176af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int rgb_stride, // bytes per scanline 177af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora float dithering, 178af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora WebPPicture* const picture) { 179af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int x, y; 180af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int width = picture->width; 181af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int height = picture->height; 182af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int has_alpha = CheckNonOpaque(a_ptr, width, height, step, rgb_stride); 183af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora VP8Random rg; 184af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 185af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (has_alpha) { 186af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora picture->colorspace |= WEBP_CSP_ALPHA_BIT; 187af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } else { 188af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora picture->colorspace &= WEBP_CSP_UV_MASK; 189af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 190af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora picture->use_argb = 0; 191af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 192af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (!WebPPictureAllocYUVA(picture, width, height)) return 0; 193af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 194af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora VP8InitRandom(&rg, dithering); 195af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora InitGammaTables(); 196af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 197af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora // Import luma plane 198af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (y = 0; y < height; ++y) { 199af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora uint8_t* const dst = &picture->y[y * picture->y_stride]; 200af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (x = 0; x < width; ++x) { 201af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int offset = step * x + y * rgb_stride; 202af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora dst[x] = RGBToY(r_ptr[offset], g_ptr[offset], b_ptr[offset], &rg); 203af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 204af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 205af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 206af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora // Downsample U/V plane 207af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (y = 0; y < (height >> 1); ++y) { 208af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (x = 0; x < (width >> 1); ++x) { 209af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora RGB_TO_UV(x, y, SUM4); 210af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 211af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (width & 1) { 212af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora RGB_TO_UV(x, y, SUM2V); 213af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 214af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 215af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (height & 1) { 216af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (x = 0; x < (width >> 1); ++x) { 217af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora RGB_TO_UV(x, y, SUM2H); 218af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 219af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (width & 1) { 220af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora RGB_TO_UV(x, y, SUM1); 221af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 222af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 223af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 224af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (has_alpha) { 225af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora assert(step >= 4); 226af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora assert(picture->a != NULL); 227af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (y = 0; y < height; ++y) { 228af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (x = 0; x < width; ++x) { 229af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora picture->a[x + y * picture->a_stride] = 230af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora a_ptr[step * x + y * rgb_stride]; 231af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 232af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 233af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 234af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return 1; 235af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 236af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 237af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#undef SUM4 238af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#undef SUM2V 239af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#undef SUM2H 240af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#undef SUM1 241af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora#undef RGB_TO_UV 242af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 243af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora//------------------------------------------------------------------------------ 244af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// call for ARGB->YUVA conversion 245af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 246af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Aroraint WebPPictureARGBToYUVADithered(WebPPicture* picture, WebPEncCSP colorspace, 247af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora float dithering) { 248af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (picture == NULL) return 0; 249af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (picture->argb == NULL) { 250af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return WebPEncodingSetError(picture, VP8_ENC_ERROR_NULL_PARAMETER); 251af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } else { 252af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const argb = (const uint8_t*)picture->argb; 253af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const r = ALPHA_IS_LAST ? argb + 2 : argb + 1; 254af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const g = ALPHA_IS_LAST ? argb + 1 : argb + 2; 255af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const b = ALPHA_IS_LAST ? argb + 0 : argb + 3; 256af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const a = ALPHA_IS_LAST ? argb + 3 : argb + 0; 257af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 258af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora picture->colorspace = colorspace; 259af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return ImportYUVAFromRGBA(r, g, b, a, 4, 4 * picture->argb_stride, 260af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora dithering, picture); 261af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 262af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 263af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 264af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Aroraint WebPPictureARGBToYUVA(WebPPicture* picture, WebPEncCSP colorspace) { 265af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return WebPPictureARGBToYUVADithered(picture, colorspace, 0.f); 266af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 267af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 268af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora//------------------------------------------------------------------------------ 269af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// call for YUVA -> ARGB conversion 270af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 271af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Aroraint WebPPictureYUVAToARGB(WebPPicture* picture) { 272af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (picture == NULL) return 0; 273af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (picture->y == NULL || picture->u == NULL || picture->v == NULL) { 274af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return WebPEncodingSetError(picture, VP8_ENC_ERROR_NULL_PARAMETER); 275af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 276af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if ((picture->colorspace & WEBP_CSP_ALPHA_BIT) && picture->a == NULL) { 277af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return WebPEncodingSetError(picture, VP8_ENC_ERROR_NULL_PARAMETER); 278af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 279af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if ((picture->colorspace & WEBP_CSP_UV_MASK) != WEBP_YUV420) { 280af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return WebPEncodingSetError(picture, VP8_ENC_ERROR_INVALID_CONFIGURATION); 281af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 282af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora // Allocate a new argb buffer (discarding the previous one). 283af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (!WebPPictureAllocARGB(picture, picture->width, picture->height)) return 0; 284af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora picture->use_argb = 1; 285af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 286af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora // Convert 287af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora { 288af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int y; 289af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int width = picture->width; 290af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int height = picture->height; 291af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int argb_stride = 4 * picture->argb_stride; 292af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora uint8_t* dst = (uint8_t*)picture->argb; 293af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t *cur_u = picture->u, *cur_v = picture->v, *cur_y = picture->y; 294af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora WebPUpsampleLinePairFunc upsample = WebPGetLinePairConverter(ALPHA_IS_LAST); 295af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 296af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora // First row, with replicated top samples. 297af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora upsample(cur_y, NULL, cur_u, cur_v, cur_u, cur_v, dst, NULL, width); 298af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora cur_y += picture->y_stride; 299af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora dst += argb_stride; 300af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora // Center rows. 301af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (y = 1; y + 1 < height; y += 2) { 302af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const top_u = cur_u; 303af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const top_v = cur_v; 304af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora cur_u += picture->uv_stride; 305af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora cur_v += picture->uv_stride; 306af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora upsample(cur_y, cur_y + picture->y_stride, top_u, top_v, cur_u, cur_v, 307af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora dst, dst + argb_stride, width); 308af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora cur_y += 2 * picture->y_stride; 309af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora dst += 2 * argb_stride; 310af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 311af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora // Last row (if needed), with replicated bottom samples. 312af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (height > 1 && !(height & 1)) { 313af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora upsample(cur_y, NULL, cur_u, cur_v, cur_u, cur_v, dst, NULL, width); 314af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 315af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora // Insert alpha values if needed, in replacement for the default 0xff ones. 316af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (picture->colorspace & WEBP_CSP_ALPHA_BIT) { 317af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (y = 0; y < height; ++y) { 318af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora uint32_t* const argb_dst = picture->argb + y * picture->argb_stride; 319af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const src = picture->a + y * picture->a_stride; 320af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int x; 321af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (x = 0; x < width; ++x) { 322af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora argb_dst[x] = (argb_dst[x] & 0x00ffffffu) | ((uint32_t)src[x] << 24); 323af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 324af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 325af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 326af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 327af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return 1; 328af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 329af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 330af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora//------------------------------------------------------------------------------ 331af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// automatic import / conversion 332af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 333af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arorastatic int Import(WebPPicture* const picture, 334af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const rgb, int rgb_stride, 335af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int step, int swap_rb, int import_alpha) { 336af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int y; 337af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const r_ptr = rgb + (swap_rb ? 2 : 0); 338af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const g_ptr = rgb + 1; 339af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const b_ptr = rgb + (swap_rb ? 0 : 2); 340af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* const a_ptr = import_alpha ? rgb + 3 : NULL; 341af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int width = picture->width; 342af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int height = picture->height; 343af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 344af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (!picture->use_argb) { 345af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return ImportYUVAFromRGBA(r_ptr, g_ptr, b_ptr, a_ptr, step, rgb_stride, 346af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 0.f /* no dithering */, picture); 347af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 348af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora if (!WebPPictureAlloc(picture)) return 0; 349af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 350af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora assert(step >= (import_alpha ? 4 : 3)); 351af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (y = 0; y < height; ++y) { 352af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora uint32_t* const dst = &picture->argb[y * picture->argb_stride]; 353af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora int x; 354af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora for (x = 0; x < width; ++x) { 355af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const int offset = step * x + y * rgb_stride; 356af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora dst[x] = MakeARGB32(import_alpha ? a_ptr[offset] : 0xff, 357af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora r_ptr[offset], g_ptr[offset], b_ptr[offset]); 358af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 359af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora } 360af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return 1; 361af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 362af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 363af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora// Public API 364af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 365af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Aroraint WebPPictureImportRGB(WebPPicture* picture, 366af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* rgb, int rgb_stride) { 367af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return (picture != NULL) ? Import(picture, rgb, rgb_stride, 3, 0, 0) : 0; 368af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 369af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 370af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Aroraint WebPPictureImportBGR(WebPPicture* picture, 371af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* rgb, int rgb_stride) { 372af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return (picture != NULL) ? Import(picture, rgb, rgb_stride, 3, 1, 0) : 0; 373af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 374af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 375af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Aroraint WebPPictureImportRGBA(WebPPicture* picture, 376af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* rgba, int rgba_stride) { 377af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return (picture != NULL) ? Import(picture, rgba, rgba_stride, 4, 0, 1) : 0; 378af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 379af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 380af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Aroraint WebPPictureImportBGRA(WebPPicture* picture, 381af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* rgba, int rgba_stride) { 382af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return (picture != NULL) ? Import(picture, rgba, rgba_stride, 4, 1, 1) : 0; 383af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 384af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 385af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Aroraint WebPPictureImportRGBX(WebPPicture* picture, 386af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* rgba, int rgba_stride) { 387af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return (picture != NULL) ? Import(picture, rgba, rgba_stride, 4, 0, 0) : 0; 388af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 389af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 390af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Aroraint WebPPictureImportBGRX(WebPPicture* picture, 391af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora const uint8_t* rgba, int rgba_stride) { 392af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora return (picture != NULL) ? Import(picture, rgba, rgba_stride, 4, 1, 0) : 0; 393af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora} 394af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora 395af51b94a435132e9014c324e25fb686b3d07a8c8Vikas Arora//------------------------------------------------------------------------------ 396