15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright 2011 Google Inc. All Rights Reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 3eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// Use of this source code is governed by a BSD-style license 4eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// that can be found in the COPYING file in the root of the source 5eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// tree. An additional intellectual property rights grant can be found 6eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// in the file PATENTS. All contributing project authors may 7eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch// be found in the AUTHORS file in the root of the source tree. 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// ----------------------------------------------------------------------------- 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Everything about WebPDecBuffer 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Author: Skal (pascal.massimino@gmail.com) 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <stdlib.h> 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "./vp8i.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "./webpi.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "../utils/utils.h" 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// WebPDecBuffer 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Number of bytes per pixel for the different color-spaces. 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static const int kModeBpp[MODE_LAST] = { 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 3, 4, 3, 4, 4, 2, 2, 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 4, 4, 4, 2, // pre-multiplied modes 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1, 1 }; 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Check that webp_csp_mode is within the bounds of WEBP_CSP_MODE. 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Convert to an integer to handle both the unsigned/signed enum cases 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// without the need for casting to remove type limit warnings. 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static int IsValidColorspace(int webp_csp_mode) { 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return (webp_csp_mode >= MODE_RGB && webp_csp_mode < MODE_LAST); 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static VP8StatusCode CheckDecBuffer(const WebPDecBuffer* const buffer) { 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int ok = 1; 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const WEBP_CSP_MODE mode = buffer->colorspace; 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int width = buffer->width; 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int height = buffer->height; 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!IsValidColorspace(mode)) { 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ok = 0; 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else if (!WebPIsRGBMode(mode)) { // YUV checks 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const WebPYUVABuffer* const buf = &buffer->u.YUVA; 455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int y_stride = abs(buf->y_stride); 465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int u_stride = abs(buf->u_stride); 475f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int v_stride = abs(buf->v_stride); 485f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int a_stride = abs(buf->a_stride); 495f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint64_t y_size = (uint64_t)y_stride * height; 505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint64_t u_size = (uint64_t)u_stride * ((height + 1) / 2); 515f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint64_t v_size = (uint64_t)v_stride * ((height + 1) / 2); 525f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint64_t a_size = (uint64_t)a_stride * height; 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ok &= (y_size <= buf->y_size); 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ok &= (u_size <= buf->u_size); 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ok &= (v_size <= buf->v_size); 565f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) ok &= (y_stride >= width); 575f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) ok &= (u_stride >= (width + 1) / 2); 585f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) ok &= (v_stride >= (width + 1) / 2); 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ok &= (buf->y != NULL); 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ok &= (buf->u != NULL); 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ok &= (buf->v != NULL); 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mode == MODE_YUVA) { 635f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) ok &= (a_stride >= width); 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ok &= (a_size <= buf->a_size); 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ok &= (buf->a != NULL); 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { // RGB checks 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const WebPRGBABuffer* const buf = &buffer->u.RGBA; 695f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int stride = abs(buf->stride); 705f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const uint64_t size = (uint64_t)stride * height; 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ok &= (size <= buf->size); 725f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) ok &= (stride >= width * kModeBpp[mode]); 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ok &= (buf->rgba != NULL); 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return ok ? VP8_STATUS_OK : VP8_STATUS_INVALID_PARAM; 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)static VP8StatusCode AllocateBuffer(WebPDecBuffer* const buffer) { 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int w = buffer->width; 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int h = buffer->height; 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const WEBP_CSP_MODE mode = buffer->colorspace; 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (w <= 0 || h <= 0 || !IsValidColorspace(mode)) { 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_INVALID_PARAM; 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!buffer->is_external_memory && buffer->private_memory == NULL) { 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint8_t* output; 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int uv_stride = 0, a_stride = 0; 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint64_t uv_size = 0, a_size = 0, total_size; 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // We need memory and it hasn't been allocated yet. 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // => initialize output buffer, now that dimensions are known. 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int stride = w * kModeBpp[mode]; 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const uint64_t size = (uint64_t)stride * h; 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!WebPIsRGBMode(mode)) { 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uv_stride = (w + 1) / 2; 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uv_size = (uint64_t)uv_stride * ((h + 1) / 2); 995821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mode == MODE_YUVA) { 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) a_stride = w; 1015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) a_size = (uint64_t)a_stride * h; 1025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) total_size = size + 2 * uv_size + a_size; 1055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Security/sanity checks 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) output = (uint8_t*)WebPSafeMalloc(total_size, sizeof(*output)); 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (output == NULL) { 1095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_OUT_OF_MEMORY; 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->private_memory = output; 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (!WebPIsRGBMode(mode)) { // YUVA initialization 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPYUVABuffer* const buf = &buffer->u.YUVA; 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->y = output; 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->y_stride = stride; 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->y_size = (size_t)size; 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->u = output + size; 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->u_stride = uv_stride; 1205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->u_size = (size_t)uv_size; 1215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->v = output + size + uv_size; 1225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->v_stride = uv_stride; 1235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->v_size = (size_t)uv_size; 1245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (mode == MODE_YUVA) { 1255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->a = output + size + 2 * uv_size; 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->a_size = (size_t)a_size; 1285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->a_stride = a_stride; 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } else { // RGBA initialization 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPRGBABuffer* const buf = &buffer->u.RGBA; 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->rgba = output; 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->stride = stride; 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buf->size = (size_t)size; 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return CheckDecBuffer(buffer); 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1395f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)VP8StatusCode WebPFlipBuffer(WebPDecBuffer* const buffer) { 1405f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (buffer == NULL) { 1415f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return VP8_STATUS_INVALID_PARAM; 1425f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 1435f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (WebPIsRGBMode(buffer->colorspace)) { 1445f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) WebPRGBABuffer* const buf = &buffer->u.RGBA; 1455f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) buf->rgba += (buffer->height - 1) * buf->stride; 1465f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) buf->stride = -buf->stride; 1475f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } else { 1485f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) WebPYUVABuffer* const buf = &buffer->u.YUVA; 1495f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) const int H = buffer->height; 1505f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) buf->y += (H - 1) * buf->y_stride; 1515f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) buf->y_stride = -buf->y_stride; 1525f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) buf->u += ((H - 1) >> 1) * buf->u_stride; 1535f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) buf->u_stride = -buf->u_stride; 1545f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) buf->v += ((H - 1) >> 1) * buf->v_stride; 1555f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) buf->v_stride = -buf->v_stride; 1565f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (buf->a != NULL) { 1575f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) buf->a += (H - 1) * buf->a_stride; 1585f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) buf->a_stride = -buf->a_stride; 1595f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 1605f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 1615f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return VP8_STATUS_OK; 1625f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)} 1635f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)VP8StatusCode WebPAllocateDecBuffer(int w, int h, 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const WebPDecoderOptions* const options, 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPDecBuffer* const out) { 1675f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) VP8StatusCode status; 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (out == NULL || w <= 0 || h <= 0) { 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_INVALID_PARAM; 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (options != NULL) { // First, apply options if there is any. 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (options->use_cropping) { 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int cw = options->crop_width; 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int ch = options->crop_height; 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int x = options->crop_left & ~1; 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const int y = options->crop_top & ~1; 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (x < 0 || y < 0 || cw <= 0 || ch <= 0 || x + cw > w || y + ch > h) { 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_INVALID_PARAM; // out of frame boundary. 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) w = cw; 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) h = ch; 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (options->use_scaling) { 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (options->scaled_width <= 0 || options->scaled_height <= 0) { 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return VP8_STATUS_INVALID_PARAM; 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) w = options->scaled_width; 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) h = options->scaled_height; 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) out->width = w; 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) out->height = h; 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1945f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // Then, allocate buffer for real. 1955f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) status = AllocateBuffer(out); 1965f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (status != VP8_STATUS_OK) return status; 1975f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) 1985f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#if WEBP_DECODER_ABI_VERSION > 0x0203 1995f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) // Use the stride trick if vertical flip is needed. 2005f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (options != NULL && options->flip) { 2015f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) status = WebPFlipBuffer(out); 2025f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2035f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles)#endif 2045f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) return status; 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// constructors / destructors 2095821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)int WebPInitDecBufferInternal(WebPDecBuffer* buffer, int version) { 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_DECODER_ABI_VERSION)) { 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 0; // version mismatch 2135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (buffer == NULL) return 0; 2155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) memset(buffer, 0, sizeof(*buffer)); 2165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) return 1; 2175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void WebPFreeDecBuffer(WebPDecBuffer* buffer) { 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (buffer != NULL) { 2215f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) if (!buffer->is_external_memory) { 2225f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) WebPSafeFree(buffer->private_memory); 2235f1c94371a64b3196d4be9466099bb892df9b88eTorne (Richard Coles) } 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) buffer->private_memory = NULL; 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void WebPCopyDecBuffer(const WebPDecBuffer* const src, 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) WebPDecBuffer* const dst) { 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (src != NULL && dst != NULL) { 2315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *dst = *src; 2325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (src->private_memory != NULL) { 2335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dst->is_external_memory = 1; // dst buffer doesn't own the memory. 2345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) dst->private_memory = NULL; 2355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copy and transfer ownership from src to dst (beware of parameter order!) 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)void WebPGrabDecBuffer(WebPDecBuffer* const src, WebPDecBuffer* const dst) { 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (src != NULL && dst != NULL) { 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) *dst = *src; 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) if (src->private_memory != NULL) { 2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) src->is_external_memory = 1; // src relinquishes ownership 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) src->private_memory = NULL; 2465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} 2495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)//------------------------------------------------------------------------------ 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 252