Switching Skia to chromium's libjpeg-turbo

src/codec/SkJpegCodec.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCodec.h"
 #include "SkJpegCodec.h"
 #include "SkJpegDecoderMgr.h"
@@ skipping 93 matching lines @@
 
     // libjpeg errors will be caught and reported here
     if (setjmp(decoderMgr->getJmpBuf())) {
         return decoderMgr->returnFalse("setjmp");
     }
 
     // Initialize the decompress info and the source manager
     decoderMgr->init();
 
     // Read the jpeg header
-    if (JPEG_HEADER_OK != turbo_jpeg_read_header(decoderMgr->dinfo(), true)) {
+    if (JPEG_HEADER_OK != chromium_jpeg_read_header(decoderMgr->dinfo(), true)) {
         return decoderMgr->returnFalse("read_header");
     }
 
     if (NULL != codecOut) {
         // Recommend the color type to decode to
         const SkColorType colorType = decoderMgr->getColorType();
 
         // Create image info object and the codec
         const SkImageInfo& imageInfo = SkImageInfo::Make(decoderMgr->dinfo()->image_width,
                 decoderMgr->dinfo()->image_height, colorType, kOpaque_SkAlphaType);
@@ skipping 51 matching lines @@
 
     // Set up a fake decompress struct in order to use libjpeg to calculate output dimensions
     jpeg_decompress_struct dinfo;
     sk_bzero(&dinfo, sizeof(dinfo));
     dinfo.image_width = this->getInfo().width();
     dinfo.image_height = this->getInfo().height();
     dinfo.global_state = DSTATE_READY;
     dinfo.num_components = 0;
     dinfo.scale_num = num;
     dinfo.scale_denom = denom;
-    turbo_jpeg_calc_output_dimensions(&dinfo);
+    chromium_jpeg_calc_output_dimensions(&dinfo);
 
     // Return the calculated output dimensions for the given scale
     return SkISize::Make(dinfo.output_width, dinfo.output_height);
 }
 
 /*
  * Handles rewinding the input stream if it is necessary
  */
 bool SkJpegCodec::handleRewind() {
     switch(this->rewindIfNeeded()) {
@@ skipping 75 matching lines @@
 }
 
 /*
  * Checks if we can scale to the requested dimensions and scales the dimensions
  * if possible
  */
 bool SkJpegCodec::scaleToDimensions(uint32_t dstWidth, uint32_t dstHeight) {
     // libjpeg-turbo can scale to 1/8, 1/4, 3/8, 1/2, 5/8, 3/4, 7/8, and 1/1
     fDecoderMgr->dinfo()->scale_denom = 8;
     fDecoderMgr->dinfo()->scale_num = 8;
-    turbo_jpeg_calc_output_dimensions(fDecoderMgr->dinfo());
+    chromium_jpeg_calc_output_dimensions(fDecoderMgr->dinfo());
     while (fDecoderMgr->dinfo()->output_width != dstWidth ||
             fDecoderMgr->dinfo()->output_height != dstHeight) {
 
         // Return a failure if we have tried all of the possible scales
         if (1 == fDecoderMgr->dinfo()->scale_num ||
                 dstWidth > fDecoderMgr->dinfo()->output_width ||
                 dstHeight > fDecoderMgr->dinfo()->output_height) {
             return fDecoderMgr->returnFalse("could not scale to requested dimensions");
         }
 
         // Try the next scale
         fDecoderMgr->dinfo()->scale_num -= 1;
-        turbo_jpeg_calc_output_dimensions(fDecoderMgr->dinfo());
+        chromium_jpeg_calc_output_dimensions(fDecoderMgr->dinfo());
     }
     return true;
 }
 
 /*
  * Performs the jpeg decode
  */
 SkCodec::Result SkJpegCodec::onGetPixels(const SkImageInfo& dstInfo,
                                          void* dst, size_t dstRowBytes,
                                          const Options& options, SkPMColor*, int*) {
@@ skipping 19 matching lines @@
     if (!this->setOutputColorSpace(dstInfo)) {
         return fDecoderMgr->returnFailure("conversion_possible", kInvalidConversion);
     }
 
     // Perform the necessary scaling
     if (!this->scaleToDimensions(dstInfo.width(), dstInfo.height())) {
         return fDecoderMgr->returnFailure("cannot scale to requested dims", kInvalidScale);
     }
 
     // Now, given valid output dimensions, we can start the decompress
-    if (!turbo_jpeg_start_decompress(dinfo)) {
+    if (!chromium_jpeg_start_decompress(dinfo)) {
         return fDecoderMgr->returnFailure("startDecompress", kInvalidInput);
     }
 
     // The recommended output buffer height should always be 1 in high quality modes.
     // If it's not, we want to know because it means our strategy is not optimal.
     SkASSERT(1 == dinfo->rec_outbuf_height);
 
     // Perform the decode a single row at a time
     uint32_t dstHeight = dstInfo.height();
     JSAMPLE* dstRow = (JSAMPLE*) dst;
     for (uint32_t y = 0; y < dstHeight; y++) {
         // Read rows of the image
-        uint32_t rowsDecoded = turbo_jpeg_read_scanlines(dinfo, &dstRow, 1);
+        uint32_t rowsDecoded = chromium_jpeg_read_scanlines(dinfo, &dstRow, 1);
 
         // If we cannot read enough rows, assume the input is incomplete
         if (rowsDecoded != 1) {
             // Fill the remainder of the image with black. This error handling
             // behavior is unspecified but SkCodec consistently uses black as
             // the fill color for opaque images.  If the destination is kGray,
             // the low 8 bits of SK_ColorBLACK will be used.  Conveniently,
             // these are zeros, which is the representation for black in kGray.
             // If the destination is kRGB_565, the low 16 bits of SK_ColorBLACK
             // will be used.  Conveniently, these are zeros, which is the
             // representation for black in kRGB_565.
             if (kNo_ZeroInitialized == options.fZeroInitialized ||
                     kN32_SkColorType == dstInfo.colorType()) {
                 SkSwizzler::Fill(dstRow, dstInfo, dstRowBytes, dstHeight - y,
                         SK_ColorBLACK, NULL);
             }
 
             // Prevent libjpeg from failing on incomplete decode
             dinfo->output_scanline = dstHeight;
 
             // Finish the decode and indicate that the input was incomplete.
-            turbo_jpeg_finish_decompress(dinfo);
+            chromium_jpeg_finish_decompress(dinfo);
             return fDecoderMgr->returnFailure("Incomplete image data", kIncompleteInput);
         }
 
         // Convert to RGBA if necessary
         if (JCS_CMYK == dinfo->out_color_space) {
             convert_CMYK_to_RGBA(dstRow, dstInfo.width());
         }
 
         // Move to the next row
         dstRow = SkTAddOffset<JSAMPLE>(dstRow, dstRowBytes);
     }
-    turbo_jpeg_finish_decompress(dinfo);
+    chromium_jpeg_finish_decompress(dinfo);
 
     return kSuccess;
 }
 
 /*
  * Enable scanline decoding for jpegs
  */
 class SkJpegScanlineDecoder : public SkScanlineDecoder {
 public:
     SkJpegScanlineDecoder(const SkImageInfo& srcInfo, SkJpegCodec* codec)
@@ skipping 20 matching lines @@
         if (!fCodec->setOutputColorSpace(dstInfo)) {
             return SkCodec::kInvalidConversion;
         }
 
         // Perform the necessary scaling
         if (!fCodec->scaleToDimensions(dstInfo.width(), dstInfo.height())) {
             return SkCodec::kInvalidScale;
         }
 
         // Now, given valid output dimensions, we can start the decompress
-        if (!turbo_jpeg_start_decompress(fCodec->fDecoderMgr->dinfo())) {
+        if (!chromium_jpeg_start_decompress(fCodec->fDecoderMgr->dinfo())) {
             SkCodecPrintf("start decompress failed\n");
             return SkCodec::kInvalidInput;
         }
 
         fOpts = options;
 
         return SkCodec::kSuccess;
     }
 
     virtual ~SkJpegScanlineDecoder() {
         if (setjmp(fCodec->fDecoderMgr->getJmpBuf())) {
             SkCodecPrintf("setjmp: Error in libjpeg finish_decompress\n");
             return;
         }
 
         // We may not have decoded the entire image.  Prevent libjpeg-turbo from failing on a
         // partial decode.
         fCodec->fDecoderMgr->dinfo()->output_scanline = fCodec->getInfo().height();
-        turbo_jpeg_finish_decompress(fCodec->fDecoderMgr->dinfo());
+        chromium_jpeg_finish_decompress(fCodec->fDecoderMgr->dinfo());
     }
 
     SkCodec::Result onGetScanlines(void* dst, int count, size_t rowBytes) override {
         // Set the jump location for libjpeg errors
         if (setjmp(fCodec->fDecoderMgr->getJmpBuf())) {
             return fCodec->fDecoderMgr->returnFailure("setjmp", SkCodec::kInvalidInput);
         }
 
         // Read rows one at a time
         JSAMPLE* dstRow = (JSAMPLE*) dst;
         for (int y = 0; y < count; y++) {
             // Read row of the image
             uint32_t rowsDecoded =
-                    turbo_jpeg_read_scanlines(fCodec->fDecoderMgr->dinfo(), &dstRow, 1);
+                    chromium_jpeg_read_scanlines(fCodec->fDecoderMgr->dinfo(), &dstRow, 1);
             if (rowsDecoded != 1) {
                 if (SkCodec::kNo_ZeroInitialized == fOpts.fZeroInitialized ||
                         kN32_SkColorType == this->dstInfo().colorType()) {
                     SkSwizzler::Fill(dstRow, this->dstInfo(), rowBytes,
                             count - y, SK_ColorBLACK, NULL);
                 }
                 fCodec->fDecoderMgr->dinfo()->output_scanline = this->dstInfo().height();
                 return SkCodec::kIncompleteInput;
             }
 
             // Convert to RGBA if necessary
             if (JCS_CMYK == fCodec->fDecoderMgr->dinfo()->out_color_space) {
                 convert_CMYK_to_RGBA(dstRow, this->dstInfo().width());
             }
 
             // Move to the next row
             dstRow = SkTAddOffset<JSAMPLE>(dstRow, rowBytes);
         }
 
         return SkCodec::kSuccess;
     }
 
 #ifndef TURBO_HAS_SKIP
-#define turbo_jpeg_skip_scanlines(dinfo, count)                              \
+// TODO (msarett): Make this a member function and avoid reallocating the
+//                 memory buffer on each call to skip.
+#define chromium_jpeg_skip_scanlines(dinfo, count)                           \
     SkAutoMalloc storage(dinfo->output_width * dinfo->out_color_components); \
     uint8_t* storagePtr = static_cast<uint8_t*>(storage.get());              \
     for (int y = 0; y < count; y++) {                                        \
-        turbo_jpeg_read_scanlines(dinfo, &storagePtr, 1);                    \
+        chromium_jpeg_read_scanlines(dinfo, &storagePtr, 1);                 \
     }
 #endif
 
     SkCodec::Result onSkipScanlines(int count) override {
         // Set the jump location for libjpeg errors
         if (setjmp(fCodec->fDecoderMgr->getJmpBuf())) {
             return fCodec->fDecoderMgr->returnFailure("setjmp", SkCodec::kInvalidInput);
         }
 
-        turbo_jpeg_skip_scanlines(fCodec->fDecoderMgr->dinfo(), count);
+        chromium_jpeg_skip_scanlines(fCodec->fDecoderMgr->dinfo(), count);
 
         return SkCodec::kSuccess;
     }
 
+#ifndef TURBO_HAS_SKIP
+#undef chromium_jpeg_skip_scanlines
+#endif
+
 private:
     SkAutoTDelete<SkJpegCodec> fCodec;
     SkCodec::Options           fOpts;
 
     typedef SkScanlineDecoder INHERITED;
 };
 
 SkScanlineDecoder* SkJpegCodec::NewSDFromStream(SkStream* stream) {
     SkAutoTDelete<SkJpegCodec> codec(static_cast<SkJpegCodec*>(SkJpegCodec::NewFromStream(stream)));
     if (!codec) {
         return NULL;
     }
 
     const SkImageInfo& srcInfo = codec->getInfo();
     // Return the new scanline decoder
     return SkNEW_ARGS(SkJpegScanlineDecoder, (srcInfo, codec.detach()));
 }