1 /* 2 Copyright (C) 1998 Lars Knoll (knoll (at) mpi-hd.mpg.de) 3 Copyright (C) 2001 Dirk Mueller (mueller (at) kde.org) 4 Copyright (C) 2002 Waldo Bastian (bastian (at) kde.org) 5 Copyright (C) 2006 Samuel Weinig (sam.weinig (at) gmail.com) 6 Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved. 7 8 This library is free software; you can redistribute it and/or 9 modify it under the terms of the GNU Library General Public 10 License as published by the Free Software Foundation; either 11 version 2 of the License, or (at your option) any later version. 12 13 This library is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 Library General Public License for more details. 17 18 You should have received a copy of the GNU Library General Public License 19 along with this library; see the file COPYING.LIB. If not, write to 20 the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 21 Boston, MA 02110-1301, USA. 22 */ 23 24 #include "config.h" 25 #include "core/fetch/ImageResource.h" 26 27 #include "RuntimeEnabledFeatures.h" 28 #include "core/fetch/ImageResourceClient.h" 29 #include "core/fetch/MemoryCache.h" 30 #include "core/fetch/ResourceClient.h" 31 #include "core/fetch/ResourceClientWalker.h" 32 #include "core/fetch/ResourceFetcher.h" 33 #include "core/frame/FrameView.h" 34 #include "core/rendering/RenderObject.h" 35 #include "core/svg/graphics/SVGImage.h" 36 #include "platform/SharedBuffer.h" 37 #include "platform/graphics/BitmapImage.h" 38 #include "wtf/CurrentTime.h" 39 #include "wtf/StdLibExtras.h" 40 #include "wtf/Vector.h" 41 42 using namespace std; 43 44 namespace WebCore { 45 46 ImageResource::ImageResource(const ResourceRequest& resourceRequest) 47 : Resource(resourceRequest, Image) 48 , m_devicePixelRatioHeaderValue(1.0) 49 , m_image(0) 50 , m_loadingMultipartContent(false) 51 , m_hasDevicePixelRatioHeaderValue(false) 52 { 53 setStatus(Unknown); 54 setCustomAcceptHeader(); 55 } 56 57 ImageResource::ImageResource(WebCore::Image* image) 58 : Resource(ResourceRequest(""), Image) 59 , m_image(image) 60 { 61 setStatus(Cached); 62 setLoading(false); 63 setCustomAcceptHeader(); 64 } 65 66 ImageResource::~ImageResource() 67 { 68 clearImage(); 69 } 70 71 void ImageResource::load(ResourceFetcher* fetcher, const ResourceLoaderOptions& options) 72 { 73 if (!fetcher || fetcher->autoLoadImages()) 74 Resource::load(fetcher, options); 75 else 76 setLoading(false); 77 } 78 79 void ImageResource::didAddClient(ResourceClient* c) 80 { 81 if (m_data && !m_image && !errorOccurred()) { 82 createImage(); 83 m_image->setData(m_data, true); 84 } 85 86 ASSERT(c->resourceClientType() == ImageResourceClient::expectedType()); 87 if (m_image && !m_image->isNull()) 88 static_cast<ImageResourceClient*>(c)->imageChanged(this); 89 90 Resource::didAddClient(c); 91 } 92 93 void ImageResource::didRemoveClient(ResourceClient* c) 94 { 95 ASSERT(c); 96 ASSERT(c->resourceClientType() == ImageResourceClient::expectedType()); 97 98 m_pendingContainerSizeRequests.remove(static_cast<ImageResourceClient*>(c)); 99 if (m_svgImageCache) 100 m_svgImageCache->removeClientFromCache(static_cast<ImageResourceClient*>(c)); 101 102 Resource::didRemoveClient(c); 103 } 104 105 void ImageResource::switchClientsToRevalidatedResource() 106 { 107 ASSERT(resourceToRevalidate()); 108 ASSERT(resourceToRevalidate()->isImage()); 109 // Pending container size requests need to be transferred to the revalidated resource. 110 if (!m_pendingContainerSizeRequests.isEmpty()) { 111 // A copy of pending size requests is needed as they are deleted during Resource::switchClientsToRevalidateResouce(). 112 ContainerSizeRequests switchContainerSizeRequests; 113 for (ContainerSizeRequests::iterator it = m_pendingContainerSizeRequests.begin(); it != m_pendingContainerSizeRequests.end(); ++it) 114 switchContainerSizeRequests.set(it->key, it->value); 115 Resource::switchClientsToRevalidatedResource(); 116 ImageResource* revalidatedImageResource = toImageResource(resourceToRevalidate()); 117 for (ContainerSizeRequests::iterator it = switchContainerSizeRequests.begin(); it != switchContainerSizeRequests.end(); ++it) 118 revalidatedImageResource->setContainerSizeForRenderer(it->key, it->value.first, it->value.second); 119 return; 120 } 121 122 Resource::switchClientsToRevalidatedResource(); 123 } 124 125 void ImageResource::allClientsRemoved() 126 { 127 m_pendingContainerSizeRequests.clear(); 128 if (m_image && !errorOccurred()) 129 m_image->resetAnimation(); 130 Resource::allClientsRemoved(); 131 } 132 133 pair<WebCore::Image*, float> ImageResource::brokenImage(float deviceScaleFactor) 134 { 135 if (deviceScaleFactor >= 2) { 136 DEFINE_STATIC_REF(WebCore::Image, brokenImageHiRes, (WebCore::Image::loadPlatformResource("missingImage@2x"))); 137 return std::make_pair(brokenImageHiRes, 2); 138 } 139 140 DEFINE_STATIC_REF(WebCore::Image, brokenImageLoRes, (WebCore::Image::loadPlatformResource("missingImage"))); 141 return std::make_pair(brokenImageLoRes, 1); 142 } 143 144 bool ImageResource::willPaintBrokenImage() const 145 { 146 return errorOccurred(); 147 } 148 149 WebCore::Image* ImageResource::image() 150 { 151 ASSERT(!isPurgeable()); 152 153 if (errorOccurred()) { 154 // Returning the 1x broken image is non-ideal, but we cannot reliably access the appropriate 155 // deviceScaleFactor from here. It is critical that callers use ImageResource::brokenImage() 156 // when they need the real, deviceScaleFactor-appropriate broken image icon. 157 return brokenImage(1).first; 158 } 159 160 if (m_image) 161 return m_image.get(); 162 163 return WebCore::Image::nullImage(); 164 } 165 166 WebCore::Image* ImageResource::imageForRenderer(const RenderObject* renderer) 167 { 168 ASSERT(!isPurgeable()); 169 170 if (errorOccurred()) { 171 // Returning the 1x broken image is non-ideal, but we cannot reliably access the appropriate 172 // deviceScaleFactor from here. It is critical that callers use ImageResource::brokenImage() 173 // when they need the real, deviceScaleFactor-appropriate broken image icon. 174 return brokenImage(1).first; 175 } 176 177 if (!m_image) 178 return WebCore::Image::nullImage(); 179 180 if (m_image->isSVGImage()) { 181 WebCore::Image* image = m_svgImageCache->imageForRenderer(renderer); 182 if (image != WebCore::Image::nullImage()) 183 return image; 184 } 185 186 return m_image.get(); 187 } 188 189 void ImageResource::setContainerSizeForRenderer(const ImageResourceClient* renderer, const IntSize& containerSize, float containerZoom) 190 { 191 if (containerSize.isEmpty()) 192 return; 193 ASSERT(renderer); 194 ASSERT(containerZoom); 195 if (!m_image) { 196 m_pendingContainerSizeRequests.set(renderer, SizeAndZoom(containerSize, containerZoom)); 197 return; 198 } 199 if (!m_image->isSVGImage()) { 200 m_image->setContainerSize(containerSize); 201 return; 202 } 203 204 m_svgImageCache->setContainerSizeForRenderer(renderer, containerSize, containerZoom); 205 } 206 207 bool ImageResource::usesImageContainerSize() const 208 { 209 if (m_image) 210 return m_image->usesContainerSize(); 211 212 return false; 213 } 214 215 bool ImageResource::imageHasRelativeWidth() const 216 { 217 if (m_image) 218 return m_image->hasRelativeWidth(); 219 220 return false; 221 } 222 223 bool ImageResource::imageHasRelativeHeight() const 224 { 225 if (m_image) 226 return m_image->hasRelativeHeight(); 227 228 return false; 229 } 230 231 LayoutSize ImageResource::imageSizeForRenderer(const RenderObject* renderer, float multiplier, SizeType sizeType) 232 { 233 ASSERT(!isPurgeable()); 234 235 if (!m_image) 236 return IntSize(); 237 238 LayoutSize imageSize; 239 240 if (m_image->isBitmapImage() && (renderer && renderer->shouldRespectImageOrientation() == RespectImageOrientation)) 241 imageSize = toBitmapImage(m_image.get())->sizeRespectingOrientation(); 242 else if (m_image->isSVGImage() && sizeType == NormalSize) 243 imageSize = m_svgImageCache->imageSizeForRenderer(renderer); 244 else 245 imageSize = m_image->size(); 246 247 if (multiplier == 1.0f) 248 return imageSize; 249 250 // Don't let images that have a width/height >= 1 shrink below 1 when zoomed. 251 float widthScale = m_image->hasRelativeWidth() ? 1.0f : multiplier; 252 float heightScale = m_image->hasRelativeHeight() ? 1.0f : multiplier; 253 LayoutSize minimumSize(imageSize.width() > 0 ? 1 : 0, imageSize.height() > 0 ? 1 : 0); 254 imageSize.scale(widthScale, heightScale); 255 imageSize.clampToMinimumSize(minimumSize); 256 ASSERT(multiplier != 1.0f || (imageSize.width().fraction() == 0.0f && imageSize.height().fraction() == 0.0f)); 257 return imageSize; 258 } 259 260 void ImageResource::computeIntrinsicDimensions(Length& intrinsicWidth, Length& intrinsicHeight, FloatSize& intrinsicRatio) 261 { 262 if (m_image) 263 m_image->computeIntrinsicDimensions(intrinsicWidth, intrinsicHeight, intrinsicRatio); 264 } 265 266 void ImageResource::notifyObservers(const IntRect* changeRect) 267 { 268 ResourceClientWalker<ImageResourceClient> w(m_clients); 269 while (ImageResourceClient* c = w.next()) 270 c->imageChanged(this, changeRect); 271 } 272 273 void ImageResource::clear() 274 { 275 destroyDecodedData(); 276 clearImage(); 277 m_pendingContainerSizeRequests.clear(); 278 setEncodedSize(0); 279 } 280 281 void ImageResource::setCustomAcceptHeader() 282 { 283 DEFINE_STATIC_LOCAL(const AtomicString, acceptWebP, ("image/webp,*/*;q=0.8", AtomicString::ConstructFromLiteral)); 284 setAccept(acceptWebP); 285 } 286 287 inline void ImageResource::createImage() 288 { 289 // Create the image if it doesn't yet exist. 290 if (m_image) 291 return; 292 293 if (m_response.mimeType() == "image/svg+xml") { 294 RefPtr<SVGImage> svgImage = SVGImage::create(this); 295 m_svgImageCache = SVGImageCache::create(svgImage.get()); 296 m_image = svgImage.release(); 297 } else { 298 m_image = BitmapImage::create(this); 299 } 300 301 if (m_image) { 302 // Send queued container size requests. 303 if (m_image->usesContainerSize()) { 304 for (ContainerSizeRequests::iterator it = m_pendingContainerSizeRequests.begin(); it != m_pendingContainerSizeRequests.end(); ++it) 305 setContainerSizeForRenderer(it->key, it->value.first, it->value.second); 306 } 307 m_pendingContainerSizeRequests.clear(); 308 } 309 } 310 311 inline void ImageResource::clearImage() 312 { 313 // If our Image has an observer, it's always us so we need to clear the back pointer 314 // before dropping our reference. 315 if (m_image) 316 m_image->setImageObserver(0); 317 m_image.clear(); 318 } 319 320 void ImageResource::appendData(const char* data, int length) 321 { 322 Resource::appendData(data, length); 323 if (!m_loadingMultipartContent) 324 updateImage(false); 325 } 326 327 void ImageResource::updateImage(bool allDataReceived) 328 { 329 TRACE_EVENT0("webkit", "ImageResource::updateImage"); 330 331 if (m_data) 332 createImage(); 333 334 bool sizeAvailable = false; 335 336 // Have the image update its data from its internal buffer. 337 // It will not do anything now, but will delay decoding until 338 // queried for info (like size or specific image frames). 339 if (m_image) 340 sizeAvailable = m_image->setData(m_data, allDataReceived); 341 342 // Go ahead and tell our observers to try to draw if we have either 343 // received all the data or the size is known. Each chunk from the 344 // network causes observers to repaint, which will force that chunk 345 // to decode. 346 if (sizeAvailable || allDataReceived) { 347 if (!m_image || m_image->isNull()) { 348 error(errorOccurred() ? status() : DecodeError); 349 if (inCache()) 350 memoryCache()->remove(this); 351 return; 352 } 353 354 // It would be nice to only redraw the decoded band of the image, but with the current design 355 // (decoding delayed until painting) that seems hard. 356 notifyObservers(); 357 } 358 } 359 360 void ImageResource::finishOnePart() 361 { 362 if (m_loadingMultipartContent) 363 clear(); 364 updateImage(true); 365 if (m_loadingMultipartContent) 366 m_data.clear(); 367 Resource::finishOnePart(); 368 } 369 370 void ImageResource::error(Resource::Status status) 371 { 372 clear(); 373 Resource::error(status); 374 notifyObservers(); 375 } 376 377 void ImageResource::responseReceived(const ResourceResponse& response) 378 { 379 if (m_loadingMultipartContent && m_data) 380 finishOnePart(); 381 else if (response.isMultipart()) 382 m_loadingMultipartContent = true; 383 if (RuntimeEnabledFeatures::clientHintsDprEnabled()) { 384 m_devicePixelRatioHeaderValue = response.httpHeaderField("DPR").toFloat(&m_hasDevicePixelRatioHeaderValue); 385 if (!m_hasDevicePixelRatioHeaderValue || m_devicePixelRatioHeaderValue <= 0.0) { 386 m_devicePixelRatioHeaderValue = 1.0; 387 m_hasDevicePixelRatioHeaderValue = false; 388 } 389 } 390 Resource::responseReceived(response); 391 } 392 393 void ImageResource::destroyDecodedData() 394 { 395 bool canDeleteImage = !m_image || (m_image->hasOneRef() && m_image->isBitmapImage()); 396 if (isSafeToMakePurgeable() && canDeleteImage && !isLoading()) { 397 // Image refs the data buffer so we should not make it purgeable while the image is alive. 398 // Invoking addClient() will reconstruct the image object. 399 m_image = 0; 400 setDecodedSize(0); 401 makePurgeable(true); 402 } else if (m_image && !errorOccurred()) { 403 m_image->destroyDecodedData(true); 404 } 405 } 406 407 void ImageResource::decodedSizeChanged(const WebCore::Image* image, int delta) 408 { 409 if (!image || image != m_image) 410 return; 411 412 setDecodedSize(decodedSize() + delta); 413 } 414 415 void ImageResource::didDraw(const WebCore::Image* image) 416 { 417 if (!image || image != m_image) 418 return; 419 420 double timeStamp = FrameView::currentFrameTimeStamp(); 421 if (!timeStamp) // If didDraw is called outside of a Frame paint. 422 timeStamp = currentTime(); 423 424 Resource::didAccessDecodedData(timeStamp); 425 } 426 427 bool ImageResource::shouldPauseAnimation(const WebCore::Image* image) 428 { 429 if (!image || image != m_image) 430 return false; 431 432 ResourceClientWalker<ImageResourceClient> w(m_clients); 433 while (ImageResourceClient* c = w.next()) { 434 if (c->willRenderImage(this)) 435 return false; 436 } 437 438 return true; 439 } 440 441 void ImageResource::animationAdvanced(const WebCore::Image* image) 442 { 443 if (!image || image != m_image) 444 return; 445 notifyObservers(); 446 } 447 448 void ImageResource::changedInRect(const WebCore::Image* image, const IntRect& rect) 449 { 450 if (!image || image != m_image) 451 return; 452 notifyObservers(&rect); 453 } 454 455 bool ImageResource::currentFrameKnownToBeOpaque(const RenderObject* renderer) 456 { 457 WebCore::Image* image = imageForRenderer(renderer); 458 if (image->isBitmapImage()) 459 image->nativeImageForCurrentFrame(); // force decode 460 return image->currentFrameKnownToBeOpaque(); 461 } 462 463 bool ImageResource::isAccessAllowed(SecurityOrigin* securityOrigin) 464 { 465 if (!image()->currentFrameHasSingleSecurityOrigin()) 466 return false; 467 if (passesAccessControlCheck(securityOrigin)) 468 return true; 469 return !securityOrigin->taintsCanvas(response().url()); 470 } 471 472 } // namespace WebCore 473
