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| 1 // Copyright 2011 Google Inc. All Rights Reserved. | |
| 2 // | |
| 3 // Use of this source code is governed by a BSD-style license | |
| 4 // that can be found in the COPYING file in the root of the source | |
| 5 // tree. An additional intellectual property rights grant can be found | |
| 6 // in the file PATENTS. All contributing project authors may | |
| 7 // be found in the AUTHORS file in the root of the source tree. | |
| 8 // ----------------------------------------------------------------------------- | |
| 9 // | |
| 10 // Everything about WebPDecBuffer | |
| 11 // | |
| 12 // Author: Skal (pascal.massimino@gmail.com) | |
| 13 | |
| 14 #include <stdlib.h> | |
| 15 | |
| 16 #include "./vp8i.h" | |
| 17 #include "./webpi.h" | |
| 18 #include "../utils/utils.h" | |
| 19 | |
| 20 //------------------------------------------------------------------------------ | |
| 21 // WebPDecBuffer | |
| 22 | |
| 23 // Number of bytes per pixel for the different color-spaces. | |
| 24 static const int kModeBpp[MODE_LAST] = { | |
| 25 3, 4, 3, 4, 4, 2, 2, | |
| 26 4, 4, 4, 2, // pre-multiplied modes | |
| 27 1, 1 }; | |
| 28 | |
| 29 // Check that webp_csp_mode is within the bounds of WEBP_CSP_MODE. | |
| 30 // Convert to an integer to handle both the unsigned/signed enum cases | |
| 31 // without the need for casting to remove type limit warnings. | |
| 32 static int IsValidColorspace(int webp_csp_mode) { | |
| 33 return (webp_csp_mode >= MODE_RGB && webp_csp_mode < MODE_LAST); | |
| 34 } | |
| 35 | |
| 36 // strictly speaking, the very last (or first, if flipped) row | |
| 37 // doesn't require padding. | |
| 38 #define MIN_BUFFER_SIZE(WIDTH, HEIGHT, STRIDE) \ | |
| 39 (uint64_t)(STRIDE) * ((HEIGHT) - 1) + (WIDTH) | |
| 40 | |
| 41 static VP8StatusCode CheckDecBuffer(const WebPDecBuffer* const buffer) { | |
| 42 int ok = 1; | |
| 43 const WEBP_CSP_MODE mode = buffer->colorspace; | |
| 44 const int width = buffer->width; | |
| 45 const int height = buffer->height; | |
| 46 if (!IsValidColorspace(mode)) { | |
| 47 ok = 0; | |
| 48 } else if (!WebPIsRGBMode(mode)) { // YUV checks | |
| 49 const WebPYUVABuffer* const buf = &buffer->u.YUVA; | |
| 50 const int uv_width = (width + 1) / 2; | |
| 51 const int uv_height = (height + 1) / 2; | |
| 52 const int y_stride = abs(buf->y_stride); | |
| 53 const int u_stride = abs(buf->u_stride); | |
| 54 const int v_stride = abs(buf->v_stride); | |
| 55 const int a_stride = abs(buf->a_stride); | |
| 56 const uint64_t y_size = MIN_BUFFER_SIZE(width, height, y_stride); | |
| 57 const uint64_t u_size = MIN_BUFFER_SIZE(uv_width, uv_height, u_stride); | |
| 58 const uint64_t v_size = MIN_BUFFER_SIZE(uv_width, uv_height, v_stride); | |
| 59 const uint64_t a_size = MIN_BUFFER_SIZE(width, height, a_stride); | |
| 60 ok &= (y_size <= buf->y_size); | |
| 61 ok &= (u_size <= buf->u_size); | |
| 62 ok &= (v_size <= buf->v_size); | |
| 63 ok &= (y_stride >= width); | |
| 64 ok &= (u_stride >= uv_width); | |
| 65 ok &= (v_stride >= uv_width); | |
| 66 ok &= (buf->y != NULL); | |
| 67 ok &= (buf->u != NULL); | |
| 68 ok &= (buf->v != NULL); | |
| 69 if (mode == MODE_YUVA) { | |
| 70 ok &= (a_stride >= width); | |
| 71 ok &= (a_size <= buf->a_size); | |
| 72 ok &= (buf->a != NULL); | |
| 73 } | |
| 74 } else { // RGB checks | |
| 75 const WebPRGBABuffer* const buf = &buffer->u.RGBA; | |
| 76 const int stride = abs(buf->stride); | |
| 77 const uint64_t size = MIN_BUFFER_SIZE(width, height, stride); | |
| 78 ok &= (size <= buf->size); | |
| 79 ok &= (stride >= width * kModeBpp[mode]); | |
| 80 ok &= (buf->rgba != NULL); | |
| 81 } | |
| 82 return ok ? VP8_STATUS_OK : VP8_STATUS_INVALID_PARAM; | |
| 83 } | |
| 84 #undef MIN_BUFFER_SIZE | |
| 85 | |
| 86 static VP8StatusCode AllocateBuffer(WebPDecBuffer* const buffer) { | |
| 87 const int w = buffer->width; | |
| 88 const int h = buffer->height; | |
| 89 const WEBP_CSP_MODE mode = buffer->colorspace; | |
| 90 | |
| 91 if (w <= 0 || h <= 0 || !IsValidColorspace(mode)) { | |
| 92 return VP8_STATUS_INVALID_PARAM; | |
| 93 } | |
| 94 | |
| 95 if (buffer->is_external_memory <= 0 && buffer->private_memory == NULL) { | |
| 96 uint8_t* output; | |
| 97 int uv_stride = 0, a_stride = 0; | |
| 98 uint64_t uv_size = 0, a_size = 0, total_size; | |
| 99 // We need memory and it hasn't been allocated yet. | |
| 100 // => initialize output buffer, now that dimensions are known. | |
| 101 const int stride = w * kModeBpp[mode]; | |
| 102 const uint64_t size = (uint64_t)stride * h; | |
| 103 | |
| 104 if (!WebPIsRGBMode(mode)) { | |
| 105 uv_stride = (w + 1) / 2; | |
| 106 uv_size = (uint64_t)uv_stride * ((h + 1) / 2); | |
| 107 if (mode == MODE_YUVA) { | |
| 108 a_stride = w; | |
| 109 a_size = (uint64_t)a_stride * h; | |
| 110 } | |
| 111 } | |
| 112 total_size = size + 2 * uv_size + a_size; | |
| 113 | |
| 114 // Security/sanity checks | |
| 115 output = (uint8_t*)WebPSafeMalloc(total_size, sizeof(*output)); | |
| 116 if (output == NULL) { | |
| 117 return VP8_STATUS_OUT_OF_MEMORY; | |
| 118 } | |
| 119 buffer->private_memory = output; | |
| 120 | |
| 121 if (!WebPIsRGBMode(mode)) { // YUVA initialization | |
| 122 WebPYUVABuffer* const buf = &buffer->u.YUVA; | |
| 123 buf->y = output; | |
| 124 buf->y_stride = stride; | |
| 125 buf->y_size = (size_t)size; | |
| 126 buf->u = output + size; | |
| 127 buf->u_stride = uv_stride; | |
| 128 buf->u_size = (size_t)uv_size; | |
| 129 buf->v = output + size + uv_size; | |
| 130 buf->v_stride = uv_stride; | |
| 131 buf->v_size = (size_t)uv_size; | |
| 132 if (mode == MODE_YUVA) { | |
| 133 buf->a = output + size + 2 * uv_size; | |
| 134 } | |
| 135 buf->a_size = (size_t)a_size; | |
| 136 buf->a_stride = a_stride; | |
| 137 } else { // RGBA initialization | |
| 138 WebPRGBABuffer* const buf = &buffer->u.RGBA; | |
| 139 buf->rgba = output; | |
| 140 buf->stride = stride; | |
| 141 buf->size = (size_t)size; | |
| 142 } | |
| 143 } | |
| 144 return CheckDecBuffer(buffer); | |
| 145 } | |
| 146 | |
| 147 VP8StatusCode WebPFlipBuffer(WebPDecBuffer* const buffer) { | |
| 148 if (buffer == NULL) { | |
| 149 return VP8_STATUS_INVALID_PARAM; | |
| 150 } | |
| 151 if (WebPIsRGBMode(buffer->colorspace)) { | |
| 152 WebPRGBABuffer* const buf = &buffer->u.RGBA; | |
| 153 buf->rgba += (buffer->height - 1) * buf->stride; | |
| 154 buf->stride = -buf->stride; | |
| 155 } else { | |
| 156 WebPYUVABuffer* const buf = &buffer->u.YUVA; | |
| 157 const int H = buffer->height; | |
| 158 buf->y += (H - 1) * buf->y_stride; | |
| 159 buf->y_stride = -buf->y_stride; | |
| 160 buf->u += ((H - 1) >> 1) * buf->u_stride; | |
| 161 buf->u_stride = -buf->u_stride; | |
| 162 buf->v += ((H - 1) >> 1) * buf->v_stride; | |
| 163 buf->v_stride = -buf->v_stride; | |
| 164 if (buf->a != NULL) { | |
| 165 buf->a += (H - 1) * buf->a_stride; | |
| 166 buf->a_stride = -buf->a_stride; | |
| 167 } | |
| 168 } | |
| 169 return VP8_STATUS_OK; | |
| 170 } | |
| 171 | |
| 172 VP8StatusCode WebPAllocateDecBuffer(int w, int h, | |
| 173 const WebPDecoderOptions* const options, | |
| 174 WebPDecBuffer* const out) { | |
| 175 VP8StatusCode status; | |
| 176 if (out == NULL || w <= 0 || h <= 0) { | |
| 177 return VP8_STATUS_INVALID_PARAM; | |
| 178 } | |
| 179 if (options != NULL) { // First, apply options if there is any. | |
| 180 if (options->use_cropping) { | |
| 181 const int cw = options->crop_width; | |
| 182 const int ch = options->crop_height; | |
| 183 const int x = options->crop_left & ~1; | |
| 184 const int y = options->crop_top & ~1; | |
| 185 if (x < 0 || y < 0 || cw <= 0 || ch <= 0 || x + cw > w || y + ch > h) { | |
| 186 return VP8_STATUS_INVALID_PARAM; // out of frame boundary. | |
| 187 } | |
| 188 w = cw; | |
| 189 h = ch; | |
| 190 } | |
| 191 if (options->use_scaling) { | |
| 192 int scaled_width = options->scaled_width; | |
| 193 int scaled_height = options->scaled_height; | |
| 194 if (!WebPRescalerGetScaledDimensions( | |
| 195 w, h, &scaled_width, &scaled_height)) { | |
| 196 return VP8_STATUS_INVALID_PARAM; | |
| 197 } | |
| 198 w = scaled_width; | |
| 199 h = scaled_height; | |
| 200 } | |
| 201 } | |
| 202 out->width = w; | |
| 203 out->height = h; | |
| 204 | |
| 205 // Then, allocate buffer for real. | |
| 206 status = AllocateBuffer(out); | |
| 207 if (status != VP8_STATUS_OK) return status; | |
| 208 | |
| 209 // Use the stride trick if vertical flip is needed. | |
| 210 if (options != NULL && options->flip) { | |
| 211 status = WebPFlipBuffer(out); | |
| 212 } | |
| 213 return status; | |
| 214 } | |
| 215 | |
| 216 //------------------------------------------------------------------------------ | |
| 217 // constructors / destructors | |
| 218 | |
| 219 int WebPInitDecBufferInternal(WebPDecBuffer* buffer, int version) { | |
| 220 if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_DECODER_ABI_VERSION)) { | |
| 221 return 0; // version mismatch | |
| 222 } | |
| 223 if (buffer == NULL) return 0; | |
| 224 memset(buffer, 0, sizeof(*buffer)); | |
| 225 return 1; | |
| 226 } | |
| 227 | |
| 228 void WebPFreeDecBuffer(WebPDecBuffer* buffer) { | |
| 229 if (buffer != NULL) { | |
| 230 if (buffer->is_external_memory <= 0) { | |
| 231 WebPSafeFree(buffer->private_memory); | |
| 232 } | |
| 233 buffer->private_memory = NULL; | |
| 234 } | |
| 235 } | |
| 236 | |
| 237 void WebPCopyDecBuffer(const WebPDecBuffer* const src, | |
| 238 WebPDecBuffer* const dst) { | |
| 239 if (src != NULL && dst != NULL) { | |
| 240 *dst = *src; | |
| 241 if (src->private_memory != NULL) { | |
| 242 dst->is_external_memory = 1; // dst buffer doesn't own the memory. | |
| 243 dst->private_memory = NULL; | |
| 244 } | |
| 245 } | |
| 246 } | |
| 247 | |
| 248 // Copy and transfer ownership from src to dst (beware of parameter order!) | |
| 249 void WebPGrabDecBuffer(WebPDecBuffer* const src, WebPDecBuffer* const dst) { | |
| 250 if (src != NULL && dst != NULL) { | |
| 251 *dst = *src; | |
| 252 if (src->private_memory != NULL) { | |
| 253 src->is_external_memory = 1; // src relinquishes ownership | |
| 254 src->private_memory = NULL; | |
| 255 } | |
| 256 } | |
| 257 } | |
| 258 | |
| 259 VP8StatusCode WebPCopyDecBufferPixels(const WebPDecBuffer* const src_buf, | |
| 260 WebPDecBuffer* const dst_buf) { | |
| 261 assert(src_buf != NULL && dst_buf != NULL); | |
| 262 assert(src_buf->colorspace == dst_buf->colorspace); | |
| 263 | |
| 264 dst_buf->width = src_buf->width; | |
| 265 dst_buf->height = src_buf->height; | |
| 266 if (CheckDecBuffer(dst_buf) != VP8_STATUS_OK) { | |
| 267 return VP8_STATUS_INVALID_PARAM; | |
| 268 } | |
| 269 if (WebPIsRGBMode(src_buf->colorspace)) { | |
| 270 const WebPRGBABuffer* const src = &src_buf->u.RGBA; | |
| 271 const WebPRGBABuffer* const dst = &dst_buf->u.RGBA; | |
| 272 WebPCopyPlane(src->rgba, src->stride, dst->rgba, dst->stride, | |
| 273 src_buf->width * kModeBpp[src_buf->colorspace], | |
| 274 src_buf->height); | |
| 275 } else { | |
| 276 const WebPYUVABuffer* const src = &src_buf->u.YUVA; | |
| 277 const WebPYUVABuffer* const dst = &dst_buf->u.YUVA; | |
| 278 WebPCopyPlane(src->y, src->y_stride, dst->y, dst->y_stride, | |
| 279 src_buf->width, src_buf->height); | |
| 280 WebPCopyPlane(src->u, src->u_stride, dst->u, dst->u_stride, | |
| 281 (src_buf->width + 1) / 2, (src_buf->height + 1) / 2); | |
| 282 WebPCopyPlane(src->v, src->v_stride, dst->v, dst->v_stride, | |
| 283 (src_buf->width + 1) / 2, (src_buf->height + 1) / 2); | |
| 284 if (WebPIsAlphaMode(src_buf->colorspace)) { | |
| 285 WebPCopyPlane(src->a, src->a_stride, dst->a, dst->a_stride, | |
| 286 src_buf->width, src_buf->height); | |
| 287 } | |
| 288 } | |
| 289 return VP8_STATUS_OK; | |
| 290 } | |
| 291 | |
| 292 int WebPAvoidSlowMemory(const WebPDecBuffer* const output, | |
| 293 const WebPBitstreamFeatures* const features) { | |
| 294 assert(output != NULL); | |
| 295 return (output->is_external_memory >= 2) && | |
| 296 WebPIsPremultipliedMode(output->colorspace) && | |
| 297 (features != NULL && features->has_alpha); | |
| 298 } | |
| 299 | |
| 300 //------------------------------------------------------------------------------ | |
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Chromium Code Reviews
Issue 2651883004:
libwebp-0.6.0-rc1 (Closed)
