15f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// Copyright 2014 Google Inc. All Rights Reserved. 25f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// 35f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// Use of this source code is governed by a BSD-style license 45f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// that can be found in the COPYING file in the root of the source 55f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// tree. An additional intellectual property rights grant can be found 65f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// in the file PATENTS. All contributing project authors may 75f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// be found in the AUTHORS file in the root of the source tree. 85f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// ----------------------------------------------------------------------------- 95f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// 105f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// WebPPicture utils for colorspace conversion 115f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// 125f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// Author: Skal (pascal.massimino@gmail.com) 135f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 145f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#include <assert.h> 155f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#include <stdlib.h> 165f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#include <math.h> 175f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 185f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#include "./vp8enci.h" 195f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#include "../utils/random.h" 205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#include "../dsp/yuv.h" 215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 225f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// Uncomment to disable gamma-compression during RGB->U/V averaging 235f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define USE_GAMMA_COMPRESSION 245f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 255f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static const union { 265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) uint32_t argb; 275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) uint8_t bytes[4]; 285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} test_endian = { 0xff000000u }; 295f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define ALPHA_IS_LAST (test_endian.bytes[3] == 0xff) 305f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 315f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static WEBP_INLINE uint32_t MakeARGB32(int a, int r, int g, int b) { 325f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return (((uint32_t)a << 24) | (r << 16) | (g << 8) | b); 335f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 345f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 355f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)//------------------------------------------------------------------------------ 365f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// Detection of non-trivial transparency 375f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 385f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// Returns true if alpha[] has non-0xff values. 395f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static int CheckNonOpaque(const uint8_t* alpha, int width, int height, 405f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int x_step, int y_step) { 415f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (alpha == NULL) return 0; 425f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) while (height-- > 0) { 435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int x; 445f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (x = 0; x < width * x_step; x += x_step) { 455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (alpha[x] != 0xff) return 1; // TODO(skal): check 4/8 bytes at a time. 465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 475f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) alpha += y_step; 485f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 495f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return 0; 505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 515f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 525f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// Checking for the presence of non-opaque alpha. 535f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)int WebPPictureHasTransparency(const WebPPicture* picture) { 545f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (picture == NULL) return 0; 555f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (!picture->use_argb) { 565f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return CheckNonOpaque(picture->a, picture->width, picture->height, 575f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1, picture->a_stride); 585f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } else { 595f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int x, y; 605f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint32_t* argb = picture->argb; 615f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (argb == NULL) return 0; 625f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (y = 0; y < picture->height; ++y) { 635f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (x = 0; x < picture->width; ++x) { 645f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (argb[x] < 0xff000000u) return 1; // test any alpha values != 0xff 655f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 665f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) argb += picture->argb_stride; 675f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 685f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 695f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return 0; 705f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 715f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 725f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)//------------------------------------------------------------------------------ 735f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// RGB -> YUV conversion 745f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 755f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static int RGBToY(int r, int g, int b, VP8Random* const rg) { 765f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return VP8RGBToY(r, g, b, VP8RandomBits(rg, YUV_FIX)); 775f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 785f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 795f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static int RGBToU(int r, int g, int b, VP8Random* const rg) { 805f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return VP8RGBToU(r, g, b, VP8RandomBits(rg, YUV_FIX + 2)); 815f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 825f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 835f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static int RGBToV(int r, int g, int b, VP8Random* const rg) { 845f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return VP8RGBToV(r, g, b, VP8RandomBits(rg, YUV_FIX + 2)); 855f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 865f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 875f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)//------------------------------------------------------------------------------ 885f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 895f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#if defined(USE_GAMMA_COMPRESSION) 905f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 915f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// gamma-compensates loss of resolution during chroma subsampling 925f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define kGamma 0.80 935f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define kGammaFix 12 // fixed-point precision for linear values 945f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define kGammaScale ((1 << kGammaFix) - 1) 955f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define kGammaTabFix 7 // fixed-point fractional bits precision 965f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define kGammaTabScale (1 << kGammaTabFix) 975f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define kGammaTabRounder (kGammaTabScale >> 1) 985f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define kGammaTabSize (1 << (kGammaFix - kGammaTabFix)) 995f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1005f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static int kLinearToGammaTab[kGammaTabSize + 1]; 1015f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static uint16_t kGammaToLinearTab[256]; 1025f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static int kGammaTablesOk = 0; 1035f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1045f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static void InitGammaTables(void) { 1055f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (!kGammaTablesOk) { 1065f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int v; 1075f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const double scale = 1. / kGammaScale; 1085f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (v = 0; v <= 255; ++v) { 1095f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) kGammaToLinearTab[v] = 1105f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) (uint16_t)(pow(v / 255., kGamma) * kGammaScale + .5); 1115f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 1125f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (v = 0; v <= kGammaTabSize; ++v) { 1135f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const double x = scale * (v << kGammaTabFix); 1145f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) kLinearToGammaTab[v] = (int)(pow(x, 1. / kGamma) * 255. + .5); 1155f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 1165f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) kGammaTablesOk = 1; 1175f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 1185f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 1195f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static WEBP_INLINE uint32_t GammaToLinear(uint8_t v) { 1215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return kGammaToLinearTab[v]; 1225f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 1235f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1245f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// Convert a linear value 'v' to YUV_FIX+2 fixed-point precision 1255f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// U/V value, suitable for RGBToU/V calls. 1265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static WEBP_INLINE int LinearToGamma(uint32_t base_value, int shift) { 1275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int v = base_value << shift; // final uplifted value 1285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int tab_pos = v >> (kGammaTabFix + 2); // integer part 1295f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int x = v & ((kGammaTabScale << 2) - 1); // fractional part 1305f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int v0 = kLinearToGammaTab[tab_pos]; 1315f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int v1 = kLinearToGammaTab[tab_pos + 1]; 1325f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int y = v1 * x + v0 * ((kGammaTabScale << 2) - x); // interpolate 1335f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return (y + kGammaTabRounder) >> kGammaTabFix; // descale 1345f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 1355f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1365f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#else 1375f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1385f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static void InitGammaTables(void) {} 1395f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static WEBP_INLINE uint32_t GammaToLinear(uint8_t v) { return v; } 1405f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static WEBP_INLINE int LinearToGamma(uint32_t base_value, int shift) { 1415f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return (int)(base_value << shift); 1425f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 1435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1445f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#endif // USE_GAMMA_COMPRESSION 1455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)//------------------------------------------------------------------------------ 1475f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1485f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define SUM4(ptr) LinearToGamma( \ 1495f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) GammaToLinear((ptr)[0]) + \ 1505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) GammaToLinear((ptr)[step]) + \ 1515f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) GammaToLinear((ptr)[rgb_stride]) + \ 1525f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) GammaToLinear((ptr)[rgb_stride + step]), 0) \ 1535f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1545f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define SUM2H(ptr) \ 1555f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) LinearToGamma(GammaToLinear((ptr)[0]) + GammaToLinear((ptr)[step]), 1) 1565f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define SUM2V(ptr) \ 1575f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) LinearToGamma(GammaToLinear((ptr)[0]) + GammaToLinear((ptr)[rgb_stride]), 1) 1585f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define SUM1(ptr) \ 1595f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) LinearToGamma(GammaToLinear((ptr)[0]), 2) 1605f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1615f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#define RGB_TO_UV(x, y, SUM) { \ 1625f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int src = (2 * (step * (x) + (y) * rgb_stride)); \ 1635f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int dst = (x) + (y) * picture->uv_stride; \ 1645f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int r = SUM(r_ptr + src); \ 1655f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int g = SUM(g_ptr + src); \ 1665f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int b = SUM(b_ptr + src); \ 1675f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) picture->u[dst] = RGBToU(r, g, b, &rg); \ 1685f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) picture->v[dst] = RGBToV(r, g, b, &rg); \ 1695f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 1705f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1715f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static int ImportYUVAFromRGBA(const uint8_t* const r_ptr, 1725f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const g_ptr, 1735f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const b_ptr, 1745f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const a_ptr, 1755f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int step, // bytes per pixel 1765f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int rgb_stride, // bytes per scanline 1775f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) float dithering, 1785f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) WebPPicture* const picture) { 1795f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int x, y; 1805f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int width = picture->width; 1815f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int height = picture->height; 1825f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int has_alpha = CheckNonOpaque(a_ptr, width, height, step, rgb_stride); 1835f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) VP8Random rg; 1845f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1855f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (has_alpha) { 1865f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) picture->colorspace |= WEBP_CSP_ALPHA_BIT; 1875f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } else { 1885f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) picture->colorspace &= WEBP_CSP_UV_MASK; 1895f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 1905f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) picture->use_argb = 0; 1915f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1925f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (!WebPPictureAllocYUVA(picture, width, height)) return 0; 1935f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1945f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) VP8InitRandom(&rg, dithering); 1955f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) InitGammaTables(); 1965f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1975f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // Import luma plane 1985f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (y = 0; y < height; ++y) { 1995f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) uint8_t* const dst = &picture->y[y * picture->y_stride]; 2005f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (x = 0; x < width; ++x) { 2015f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int offset = step * x + y * rgb_stride; 2025f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) dst[x] = RGBToY(r_ptr[offset], g_ptr[offset], b_ptr[offset], &rg); 2035f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2045f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2055f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2065f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // Downsample U/V plane 2075f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (y = 0; y < (height >> 1); ++y) { 2085f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (x = 0; x < (width >> 1); ++x) { 2095f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) RGB_TO_UV(x, y, SUM4); 2105f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2115f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (width & 1) { 2125f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) RGB_TO_UV(x, y, SUM2V); 2135f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2145f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2155f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (height & 1) { 2165f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (x = 0; x < (width >> 1); ++x) { 2175f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) RGB_TO_UV(x, y, SUM2H); 2185f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2195f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (width & 1) { 2205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) RGB_TO_UV(x, y, SUM1); 2215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2225f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2235f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2245f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (has_alpha) { 2255f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) assert(step >= 4); 2265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) assert(picture->a != NULL); 2275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (y = 0; y < height; ++y) { 2285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (x = 0; x < width; ++x) { 2295f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) picture->a[x + y * picture->a_stride] = 2305f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) a_ptr[step * x + y * rgb_stride]; 2315f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2325f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2335f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2345f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return 1; 2355f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 2365f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2375f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#undef SUM4 2385f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#undef SUM2V 2395f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#undef SUM2H 2405f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#undef SUM1 2415f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#undef RGB_TO_UV 2425f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)//------------------------------------------------------------------------------ 2445f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// call for ARGB->YUVA conversion 2455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)int WebPPictureARGBToYUVADithered(WebPPicture* picture, WebPEncCSP colorspace, 2475f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) float dithering) { 2485f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (picture == NULL) return 0; 2495f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (picture->argb == NULL) { 2505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return WebPEncodingSetError(picture, VP8_ENC_ERROR_NULL_PARAMETER); 2515f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } else { 2525f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const argb = (const uint8_t*)picture->argb; 2535f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const r = ALPHA_IS_LAST ? argb + 2 : argb + 1; 2545f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const g = ALPHA_IS_LAST ? argb + 1 : argb + 2; 2555f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const b = ALPHA_IS_LAST ? argb + 0 : argb + 3; 2565f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const a = ALPHA_IS_LAST ? argb + 3 : argb + 0; 2575f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2585f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) picture->colorspace = colorspace; 2595f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return ImportYUVAFromRGBA(r, g, b, a, 4, 4 * picture->argb_stride, 2605f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) dithering, picture); 2615f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2625f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 2635f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2645f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)int WebPPictureARGBToYUVA(WebPPicture* picture, WebPEncCSP colorspace) { 2655f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return WebPPictureARGBToYUVADithered(picture, colorspace, 0.f); 2665f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 2675f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2685f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)//------------------------------------------------------------------------------ 2695f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// call for YUVA -> ARGB conversion 2705f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2715f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)int WebPPictureYUVAToARGB(WebPPicture* picture) { 2725f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (picture == NULL) return 0; 2735f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (picture->y == NULL || picture->u == NULL || picture->v == NULL) { 2745f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return WebPEncodingSetError(picture, VP8_ENC_ERROR_NULL_PARAMETER); 2755f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2765f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if ((picture->colorspace & WEBP_CSP_ALPHA_BIT) && picture->a == NULL) { 2775f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return WebPEncodingSetError(picture, VP8_ENC_ERROR_NULL_PARAMETER); 2785f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2795f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if ((picture->colorspace & WEBP_CSP_UV_MASK) != WEBP_YUV420) { 2805f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return WebPEncodingSetError(picture, VP8_ENC_ERROR_INVALID_CONFIGURATION); 2815f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2825f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // Allocate a new argb buffer (discarding the previous one). 2835f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (!WebPPictureAllocARGB(picture, picture->width, picture->height)) return 0; 2845f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) picture->use_argb = 1; 2855f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2865f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // Convert 2875f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) { 2885f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int y; 2895f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int width = picture->width; 2905f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int height = picture->height; 2915f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int argb_stride = 4 * picture->argb_stride; 2925f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) uint8_t* dst = (uint8_t*)picture->argb; 2935f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t *cur_u = picture->u, *cur_v = picture->v, *cur_y = picture->y; 2945f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) WebPUpsampleLinePairFunc upsample = WebPGetLinePairConverter(ALPHA_IS_LAST); 2955f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 2965f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // First row, with replicated top samples. 2975f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) upsample(cur_y, NULL, cur_u, cur_v, cur_u, cur_v, dst, NULL, width); 2985f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) cur_y += picture->y_stride; 2995f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) dst += argb_stride; 3005f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // Center rows. 3015f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (y = 1; y + 1 < height; y += 2) { 3025f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const top_u = cur_u; 3035f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const top_v = cur_v; 3045f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) cur_u += picture->uv_stride; 3055f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) cur_v += picture->uv_stride; 3065f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) upsample(cur_y, cur_y + picture->y_stride, top_u, top_v, cur_u, cur_v, 3075f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) dst, dst + argb_stride, width); 3085f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) cur_y += 2 * picture->y_stride; 3095f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) dst += 2 * argb_stride; 3105f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 3115f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // Last row (if needed), with replicated bottom samples. 3125f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (height > 1 && !(height & 1)) { 3135f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) upsample(cur_y, NULL, cur_u, cur_v, cur_u, cur_v, dst, NULL, width); 3145f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 3155f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // Insert alpha values if needed, in replacement for the default 0xff ones. 3165f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (picture->colorspace & WEBP_CSP_ALPHA_BIT) { 3175f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (y = 0; y < height; ++y) { 3185f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) uint32_t* const argb_dst = picture->argb + y * picture->argb_stride; 3195f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const src = picture->a + y * picture->a_stride; 3205f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int x; 3215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (x = 0; x < width; ++x) { 3225f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) argb_dst[x] = (argb_dst[x] & 0x00ffffffu) | ((uint32_t)src[x] << 24); 3235f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 3245f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 3255f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 3265f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 3275f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return 1; 3285f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 3295f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3305f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)//------------------------------------------------------------------------------ 3315f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// automatic import / conversion 3325f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3335f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)static int Import(WebPPicture* const picture, 3345f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const rgb, int rgb_stride, 3355f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int step, int swap_rb, int import_alpha) { 3365f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int y; 3375f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const r_ptr = rgb + (swap_rb ? 2 : 0); 3385f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const g_ptr = rgb + 1; 3395f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const b_ptr = rgb + (swap_rb ? 0 : 2); 3405f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* const a_ptr = import_alpha ? rgb + 3 : NULL; 3415f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int width = picture->width; 3425f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int height = picture->height; 3435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3445f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (!picture->use_argb) { 3455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return ImportYUVAFromRGBA(r_ptr, g_ptr, b_ptr, a_ptr, step, rgb_stride, 3465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 0.f /* no dithering */, picture); 3475f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 3485f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (!WebPPictureAlloc(picture)) return 0; 3495f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) assert(step >= (import_alpha ? 4 : 3)); 3515f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (y = 0; y < height; ++y) { 3525f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) uint32_t* const dst = &picture->argb[y * picture->argb_stride]; 3535f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) int x; 3545f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) for (x = 0; x < width; ++x) { 3555f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int offset = step * x + y * rgb_stride; 3565f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) dst[x] = MakeARGB32(import_alpha ? a_ptr[offset] : 0xff, 3575f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) r_ptr[offset], g_ptr[offset], b_ptr[offset]); 3585f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 3595f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 3605f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return 1; 3615f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 3625f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3635f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)// Public API 3645f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3655f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)int WebPPictureImportRGB(WebPPicture* picture, 3665f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* rgb, int rgb_stride) { 3675f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return (picture != NULL) ? Import(picture, rgb, rgb_stride, 3, 0, 0) : 0; 3685f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 3695f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3705f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)int WebPPictureImportBGR(WebPPicture* picture, 3715f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* rgb, int rgb_stride) { 3725f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return (picture != NULL) ? Import(picture, rgb, rgb_stride, 3, 1, 0) : 0; 3735f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 3745f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3755f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)int WebPPictureImportRGBA(WebPPicture* picture, 3765f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* rgba, int rgba_stride) { 3775f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return (picture != NULL) ? Import(picture, rgba, rgba_stride, 4, 0, 1) : 0; 3785f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 3795f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3805f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)int WebPPictureImportBGRA(WebPPicture* picture, 3815f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* rgba, int rgba_stride) { 3825f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return (picture != NULL) ? Import(picture, rgba, rgba_stride, 4, 1, 1) : 0; 3835f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 3845f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3855f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)int WebPPictureImportRGBX(WebPPicture* picture, 3865f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* rgba, int rgba_stride) { 3875f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return (picture != NULL) ? Import(picture, rgba, rgba_stride, 4, 0, 0) : 0; 3885f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 3895f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3905f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)int WebPPictureImportBGRX(WebPPicture* picture, 3915f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint8_t* rgba, int rgba_stride) { 3925f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return (picture != NULL) ? Import(picture, rgba, rgba_stride, 4, 1, 0) : 0; 3935f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 3945f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 3955f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)//------------------------------------------------------------------------------ 396