| /* |
| * Copyright 2010, The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "SkImageDecoder.h" |
| #include "SkImageEncoder.h" |
| #include "SkColorPriv.h" |
| #include "SkScaledBitmapSampler.h" |
| #include "SkStream.h" |
| #include "SkTemplates.h" |
| #include "SkUtils.h" |
| #include "SkTScopedPtr.h" |
| |
| // A WebP decoder only, on top of (subset of) libwebp |
| // For more information on WebP image format, and libwebp library, see: |
| // http://code.google.com/speed/webp/ |
| // http://www.webmproject.org/code/#libwebp_webp_image_decoder_library |
| // http://review.webmproject.org/gitweb?p=libwebp.git |
| |
| #include <stdio.h> |
| extern "C" { |
| // If moving libwebp out of skia source tree, path for webp headers must be |
| // updated accordingly. Here, we enforce using local copy in webp sub-directory. |
| #include "webp/decode.h" |
| #include "webp/encode.h" |
| } |
| |
| #ifdef ANDROID |
| #include <cutils/properties.h> |
| |
| // Key to lookup the size of memory buffer set in system property |
| static const char KEY_MEM_CAP[] = "ro.media.dec.webp.memcap"; |
| #endif |
| |
| // this enables timing code to report milliseconds for a decode |
| //#define TIME_DECODE |
| |
| ////////////////////////////////////////////////////////////////////////// |
| ////////////////////////////////////////////////////////////////////////// |
| |
| // Define VP8 I/O on top of Skia stream |
| |
| ////////////////////////////////////////////////////////////////////////// |
| ////////////////////////////////////////////////////////////////////////// |
| |
| static const size_t WEBP_VP8_HEADER_SIZE = 64; |
| static const size_t WEBP_IDECODE_BUFFER_SZ = (1 << 16); |
| |
| // Parse headers of RIFF container, and check for valid Webp (VP8) content. |
| static bool webp_parse_header(SkStream* stream, int* width, int* height, |
| int* alpha) { |
| unsigned char buffer[WEBP_VP8_HEADER_SIZE]; |
| const uint32_t contentSize = stream->getLength(); |
| const size_t len = stream->read(buffer, WEBP_VP8_HEADER_SIZE); |
| const uint32_t read_bytes = (contentSize < WEBP_VP8_HEADER_SIZE) ? |
| contentSize : WEBP_VP8_HEADER_SIZE; |
| if (len != read_bytes) { |
| return false; // can't read enough |
| } |
| |
| WebPBitstreamFeatures features; |
| VP8StatusCode status = WebPGetFeatures(buffer, read_bytes, &features); |
| if (status != VP8_STATUS_OK) { |
| return false; // Invalid WebP file. |
| } |
| *width = features.width; |
| *height = features.height; |
| *alpha = features.has_alpha; |
| |
| // sanity check for image size that's about to be decoded. |
| { |
| Sk64 size; |
| size.setMul(*width, *height); |
| if (size.isNeg() || !size.is32()) { |
| return false; |
| } |
| // now check that if we are 4-bytes per pixel, we also don't overflow |
| if (size.get32() > (0x7FFFFFFF >> 2)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| class SkWEBPImageDecoder: public SkImageDecoder { |
| public: |
| virtual Format getFormat() const { |
| return kWEBP_Format; |
| } |
| |
| protected: |
| virtual bool onBuildTileIndex(SkStream *stream, int *width, int *height); |
| virtual bool onDecodeRegion(SkBitmap* bitmap, SkIRect rect); |
| virtual bool onDecode(SkStream* stream, SkBitmap* bm, Mode); |
| |
| private: |
| bool setDecodeConfig(SkBitmap* decodedBitmap, int width, int height); |
| SkStream *inputStream; |
| int origWidth; |
| int origHeight; |
| int hasAlpha; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkTime.h" |
| |
| class AutoTimeMillis { |
| public: |
| AutoTimeMillis(const char label[]) : |
| fLabel(label) { |
| if (!fLabel) { |
| fLabel = ""; |
| } |
| fNow = SkTime::GetMSecs(); |
| } |
| ~AutoTimeMillis() { |
| SkDebugf("---- Time (ms): %s %d\n", fLabel, SkTime::GetMSecs() - fNow); |
| } |
| private: |
| const char* fLabel; |
| SkMSec fNow; |
| }; |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| // This guy exists just to aid in debugging, as it allows debuggers to just |
| // set a break-point in one place to see all error exists. |
| static bool return_false(const SkBitmap& bm, const char msg[]) { |
| #if 0 |
| SkDebugf("libwebp error %s [%d %d]", msg, bm.width(), bm.height()); |
| #endif |
| return false; // must always return false |
| } |
| |
| static WEBP_CSP_MODE webp_decode_mode(SkBitmap* decodedBitmap, int hasAlpha) { |
| WEBP_CSP_MODE mode = MODE_LAST; |
| SkBitmap::Config config = decodedBitmap->config(); |
| // For images that have alpha, choose appropriate color mode (MODE_rgbA, |
| // MODE_rgbA_4444) that pre-multiplies RGB pixel values with transparency |
| // factor (alpha). |
| if (config == SkBitmap::kARGB_8888_Config) { |
| mode = hasAlpha ? MODE_rgbA : MODE_RGBA; |
| } else if (config == SkBitmap::kARGB_4444_Config) { |
| mode = hasAlpha ? MODE_rgbA_4444 : MODE_RGBA_4444; |
| } else if (config == SkBitmap::kRGB_565_Config) { |
| mode = MODE_RGB_565; |
| } |
| SkASSERT(mode != MODE_LAST); |
| return mode; |
| } |
| |
| // Incremental WebP image decoding. Reads input buffer of 64K size iteratively |
| // and decodes this block to appropriate color-space as per config object. |
| static bool webp_idecode(SkStream* stream, WebPDecoderConfig& config) { |
| WebPIDecoder* idec = WebPIDecode(NULL, 0, &config); |
| if (idec == NULL) { |
| WebPFreeDecBuffer(&config.output); |
| return false; |
| } |
| |
| stream->rewind(); |
| const uint32_t contentSize = stream->getLength(); |
| const uint32_t read_buffer_size = (contentSize < WEBP_IDECODE_BUFFER_SZ) ? |
| contentSize : WEBP_IDECODE_BUFFER_SZ; |
| SkAutoMalloc srcStorage(read_buffer_size); |
| unsigned char* input = (uint8_t*)srcStorage.get(); |
| if (input == NULL) { |
| WebPIDelete(idec); |
| WebPFreeDecBuffer(&config.output); |
| return false; |
| } |
| |
| bool success = true; |
| VP8StatusCode status = VP8_STATUS_SUSPENDED; |
| do { |
| const uint32_t bytes_to_read = WEBP_IDECODE_BUFFER_SZ; |
| const size_t bytes_read = stream->read(input, bytes_to_read); |
| if (bytes_read == 0) { |
| success = false; |
| break; |
| } |
| |
| status = WebPIAppend(idec, input, bytes_read); |
| if (VP8_STATUS_OK != status && VP8_STATUS_SUSPENDED != status) { |
| success = false; |
| break; |
| } |
| } while (VP8_STATUS_OK != status); |
| srcStorage.free(); |
| WebPIDelete(idec); |
| WebPFreeDecBuffer(&config.output); |
| |
| return success; |
| } |
| |
| static bool webp_get_config_resize(WebPDecoderConfig& config, |
| SkBitmap* decodedBitmap, |
| int width, int height, int hasAlpha) { |
| WEBP_CSP_MODE mode = webp_decode_mode(decodedBitmap, hasAlpha); |
| if (mode == MODE_LAST) { |
| return false; |
| } |
| |
| if (WebPInitDecoderConfig(&config) == 0) { |
| return false; |
| } |
| |
| config.output.colorspace = mode; |
| config.output.u.RGBA.rgba = (uint8_t*)decodedBitmap->getPixels(); |
| config.output.u.RGBA.stride = decodedBitmap->rowBytes(); |
| config.output.u.RGBA.size = decodedBitmap->getSize(); |
| config.output.is_external_memory = 1; |
| |
| if (width != decodedBitmap->width() || |
| height != decodedBitmap->height()) { |
| config.options.use_scaling = 1; |
| config.options.scaled_width = decodedBitmap->width(); |
| config.options.scaled_height = decodedBitmap->height(); |
| } |
| |
| return true; |
| } |
| |
| static bool webp_get_config_resize_crop(WebPDecoderConfig& config, |
| SkBitmap* decodedBitmap, |
| SkIRect region, int hasAlpha) { |
| |
| if (!webp_get_config_resize( |
| config, decodedBitmap, region.width(), region.height(), hasAlpha)) { |
| return false; |
| } |
| |
| config.options.use_cropping = 1; |
| config.options.crop_left = region.fLeft; |
| config.options.crop_top = region.fTop; |
| config.options.crop_width = region.width(); |
| config.options.crop_height = region.height(); |
| |
| return true; |
| } |
| |
| bool SkWEBPImageDecoder::setDecodeConfig(SkBitmap* decodedBitmap, |
| int width, int height) { |
| SkBitmap::Config config = this->getPrefConfig(k32Bit_SrcDepth, hasAlpha); |
| |
| // YUV converter supports output in RGB565, RGBA4444 and RGBA8888 formats. |
| if (hasAlpha) { |
| if (config != SkBitmap::kARGB_4444_Config) { |
| config = SkBitmap::kARGB_8888_Config; |
| } |
| } else { |
| if (config != SkBitmap::kRGB_565_Config && |
| config != SkBitmap::kARGB_4444_Config) { |
| config = SkBitmap::kARGB_8888_Config; |
| } |
| } |
| |
| if (!this->chooseFromOneChoice(config, width, height)) { |
| return false; |
| } |
| |
| decodedBitmap->setConfig(config, width, height, 0); |
| |
| decodedBitmap->setIsOpaque(!hasAlpha); |
| |
| return true; |
| } |
| |
| bool SkWEBPImageDecoder::onBuildTileIndex(SkStream* stream, |
| int *width, int *height) { |
| int origWidth, origHeight, hasAlpha; |
| if (!webp_parse_header(stream, &origWidth, &origHeight, &hasAlpha)) { |
| return false; |
| } |
| |
| stream->rewind(); |
| *width = origWidth; |
| *height = origHeight; |
| |
| this->inputStream = stream; |
| this->origWidth = origWidth; |
| this->origHeight = origHeight; |
| this->hasAlpha = hasAlpha; |
| |
| return true; |
| } |
| |
| static bool isConfigCompatible(SkBitmap* bitmap) { |
| SkBitmap::Config config = bitmap->config(); |
| return config == SkBitmap::kARGB_4444_Config || |
| config == SkBitmap::kRGB_565_Config || |
| config == SkBitmap::kARGB_8888_Config; |
| } |
| |
| bool SkWEBPImageDecoder::onDecodeRegion(SkBitmap* decodedBitmap, |
| SkIRect region) { |
| SkIRect rect = SkIRect::MakeWH(origWidth, origHeight); |
| |
| if (!rect.intersect(region)) { |
| // If the requested region is entirely outsides the image, just |
| // returns false |
| return false; |
| } |
| |
| const int sampleSize = this->getSampleSize(); |
| SkScaledBitmapSampler sampler(rect.width(), rect.height(), sampleSize); |
| const int width = sampler.scaledWidth(); |
| const int height = sampler.scaledHeight(); |
| |
| // The image can be decoded directly to decodedBitmap if |
| // 1. the region is within the image range |
| // 2. bitmap's config is compatible |
| // 3. bitmap's size is same as the required region (after sampled) |
| bool directDecode = (rect == region) && |
| (decodedBitmap->isNull() || |
| (isConfigCompatible(decodedBitmap) && |
| (decodedBitmap->width() == width) && |
| (decodedBitmap->height() == height))); |
| SkTScopedPtr<SkBitmap> adb; |
| SkBitmap *bitmap = decodedBitmap; |
| |
| if (!directDecode) { |
| // allocates a temp bitmap |
| bitmap = new SkBitmap; |
| adb.reset(bitmap); |
| } |
| |
| if (bitmap->isNull()) { |
| if (!setDecodeConfig(bitmap, width, height)) { |
| return false; |
| } |
| // alloc from native heap if it is a temp bitmap. (prevent GC) |
| bool allocResult = (bitmap == decodedBitmap) |
| ? allocPixelRef(bitmap, NULL) |
| : bitmap->allocPixels(); |
| if (!allocResult) { |
| return return_false(*decodedBitmap, "allocPixelRef"); |
| } |
| } else { |
| // This is also called in setDecodeConfig in above block. |
| // i.e., when bitmap->isNull() is true. |
| if (!chooseFromOneChoice(bitmap->config(), width, height)) { |
| return false; |
| } |
| } |
| |
| SkAutoLockPixels alp(*bitmap); |
| WebPDecoderConfig config; |
| if (!webp_get_config_resize_crop(config, bitmap, rect, hasAlpha)) { |
| return false; |
| } |
| |
| // Decode the WebP image data stream using WebP incremental decoding for |
| // the specified cropped image-region. |
| if (!webp_idecode(this->inputStream, config)) { |
| return false; |
| } |
| |
| if (!directDecode) { |
| cropBitmap(decodedBitmap, bitmap, sampleSize, region.x(), region.y(), |
| region.width(), region.height(), rect.x(), rect.y()); |
| } |
| return true; |
| } |
| |
| bool SkWEBPImageDecoder::onDecode(SkStream* stream, SkBitmap* decodedBitmap, |
| Mode mode) { |
| #ifdef TIME_DECODE |
| AutoTimeMillis atm("WEBP Decode"); |
| #endif |
| |
| int origWidth, origHeight, hasAlpha; |
| if (!webp_parse_header(stream, &origWidth, &origHeight, &hasAlpha)) { |
| return false; |
| } |
| this->hasAlpha = hasAlpha; |
| |
| const int sampleSize = this->getSampleSize(); |
| SkScaledBitmapSampler sampler(origWidth, origHeight, sampleSize); |
| |
| // If only bounds are requested, done |
| if (SkImageDecoder::kDecodeBounds_Mode == mode) { |
| if (!setDecodeConfig(decodedBitmap, sampler.scaledWidth(), |
| sampler.scaledHeight())) { |
| return false; |
| } |
| return true; |
| } |
| #ifdef SK_BUILD_FOR_ANDROID |
| // No Bitmap reuse supported for this format |
| if (!decodedBitmap->isNull()) { |
| return false; |
| } |
| #endif |
| if (!setDecodeConfig(decodedBitmap, sampler.scaledWidth(), |
| sampler.scaledHeight())) { |
| return false; |
| } |
| |
| if (!this->allocPixelRef(decodedBitmap, NULL)) { |
| return return_false(*decodedBitmap, "allocPixelRef"); |
| } |
| |
| SkAutoLockPixels alp(*decodedBitmap); |
| |
| WebPDecoderConfig config; |
| if (!webp_get_config_resize(config, decodedBitmap, origWidth, origHeight, |
| hasAlpha)) { |
| return false; |
| } |
| |
| // Decode the WebP image data stream using WebP incremental decoding. |
| return webp_idecode(stream, config); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| typedef void (*ScanlineImporter)(const uint8_t* in, uint8_t* out, int width, |
| const SkPMColor* SK_RESTRICT ctable); |
| |
| static void ARGB_8888_To_RGB(const uint8_t* in, uint8_t* rgb, int width, |
| const SkPMColor*) { |
| const uint32_t* SK_RESTRICT src = (const uint32_t*)in; |
| for (int i = 0; i < width; ++i) { |
| const uint32_t c = *src++; |
| rgb[0] = SkGetPackedR32(c); |
| rgb[1] = SkGetPackedG32(c); |
| rgb[2] = SkGetPackedB32(c); |
| rgb += 3; |
| } |
| } |
| |
| static void RGB_565_To_RGB(const uint8_t* in, uint8_t* rgb, int width, |
| const SkPMColor*) { |
| const uint16_t* SK_RESTRICT src = (const uint16_t*)in; |
| for (int i = 0; i < width; ++i) { |
| const uint16_t c = *src++; |
| rgb[0] = SkPacked16ToR32(c); |
| rgb[1] = SkPacked16ToG32(c); |
| rgb[2] = SkPacked16ToB32(c); |
| rgb += 3; |
| } |
| } |
| |
| static void ARGB_4444_To_RGB(const uint8_t* in, uint8_t* rgb, int width, |
| const SkPMColor*) { |
| const SkPMColor16* SK_RESTRICT src = (const SkPMColor16*)in; |
| for (int i = 0; i < width; ++i) { |
| const SkPMColor16 c = *src++; |
| rgb[0] = SkPacked4444ToR32(c); |
| rgb[1] = SkPacked4444ToG32(c); |
| rgb[2] = SkPacked4444ToB32(c); |
| rgb += 3; |
| } |
| } |
| |
| static void Index8_To_RGB(const uint8_t* in, uint8_t* rgb, int width, |
| const SkPMColor* SK_RESTRICT ctable) { |
| const uint8_t* SK_RESTRICT src = (const uint8_t*)in; |
| for (int i = 0; i < width; ++i) { |
| const uint32_t c = ctable[*src++]; |
| rgb[0] = SkGetPackedR32(c); |
| rgb[1] = SkGetPackedG32(c); |
| rgb[2] = SkGetPackedB32(c); |
| rgb += 3; |
| } |
| } |
| |
| static ScanlineImporter ChooseImporter(const SkBitmap::Config& config) { |
| switch (config) { |
| case SkBitmap::kARGB_8888_Config: |
| return ARGB_8888_To_RGB; |
| case SkBitmap::kRGB_565_Config: |
| return RGB_565_To_RGB; |
| case SkBitmap::kARGB_4444_Config: |
| return ARGB_4444_To_RGB; |
| case SkBitmap::kIndex8_Config: |
| return Index8_To_RGB; |
| default: |
| return NULL; |
| } |
| } |
| |
| static int StreamWriter(const uint8_t* data, size_t data_size, |
| const WebPPicture* const picture) { |
| SkWStream* const stream = (SkWStream*)picture->custom_ptr; |
| return stream->write(data, data_size) ? 1 : 0; |
| } |
| |
| class SkWEBPImageEncoder : public SkImageEncoder { |
| protected: |
| virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality); |
| }; |
| |
| bool SkWEBPImageEncoder::onEncode(SkWStream* stream, const SkBitmap& bm, |
| int quality) { |
| const SkBitmap::Config config = bm.getConfig(); |
| const ScanlineImporter scanline_import = ChooseImporter(config); |
| if (NULL == scanline_import) { |
| return false; |
| } |
| |
| SkAutoLockPixels alp(bm); |
| SkAutoLockColors ctLocker; |
| if (NULL == bm.getPixels()) { |
| return false; |
| } |
| |
| WebPConfig webp_config; |
| if (!WebPConfigPreset(&webp_config, WEBP_PRESET_DEFAULT, quality)) { |
| return false; |
| } |
| |
| WebPPicture pic; |
| WebPPictureInit(&pic); |
| pic.width = bm.width(); |
| pic.height = bm.height(); |
| pic.writer = StreamWriter; |
| pic.custom_ptr = (void*)stream; |
| |
| const SkPMColor* colors = ctLocker.lockColors(bm); |
| const uint8_t* src = (uint8_t*)bm.getPixels(); |
| const int rgb_stride = pic.width * 3; |
| |
| // Import (for each scanline) the bit-map image (in appropriate color-space) |
| // to RGB color space. |
| uint8_t* rgb = new uint8_t[rgb_stride * pic.height]; |
| for (int y = 0; y < pic.height; ++y) { |
| scanline_import(src + y * bm.rowBytes(), rgb + y * rgb_stride, |
| pic.width, colors); |
| } |
| |
| bool ok = WebPPictureImportRGB(&pic, rgb, rgb_stride); |
| delete[] rgb; |
| |
| ok = ok && WebPEncode(&webp_config, &pic); |
| WebPPictureFree(&pic); |
| |
| return ok; |
| } |
| |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| DEFINE_DECODER_CREATOR(WEBPImageDecoder); |
| DEFINE_ENCODER_CREATOR(WEBPImageEncoder); |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkTRegistry.h" |
| |
| static SkImageDecoder* sk_libwebp_dfactory(SkStream* stream) { |
| int width, height, hasAlpha; |
| if (!webp_parse_header(stream, &width, &height, &hasAlpha)) { |
| return NULL; |
| } |
| |
| // Magic matches, call decoder |
| return SkNEW(SkWEBPImageDecoder); |
| } |
| |
| static SkImageEncoder* sk_libwebp_efactory(SkImageEncoder::Type t) { |
| return (SkImageEncoder::kWEBP_Type == t) ? SkNEW(SkWEBPImageEncoder) : NULL; |
| } |
| |
| static SkTRegistry<SkImageDecoder*, SkStream*> gDReg(sk_libwebp_dfactory); |
| static SkTRegistry<SkImageEncoder*, SkImageEncoder::Type> gEReg(sk_libwebp_efactory); |
