Moving GraphicsContext and dependencies from core to platform.

Source/core/platform/image-encoders/skia/JPEGImageEncoder.cpp

-/*
- * Copyright (c) 2010, Google Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "config.h"
-#include "core/platform/image-encoders/skia/JPEGImageEncoder.h"
-
-#include "SkBitmap.h"
-#include "SkColorPriv.h"
-#include "core/platform/graphics/ImageBuffer.h"
-#include "platform/geometry/IntSize.h"
-extern "C" {
-#include <setjmp.h>
-#include <stdio.h> // jpeglib.h needs stdio.h FILE
-#include "jpeglib.h"
-}
-
-namespace WebCore {
-
-struct JPEGOutputBuffer : public jpeg_destination_mgr {
-    Vector<unsigned char>* output;
-    Vector<unsigned char> buffer;
-};
-
-static void prepareOutput(j_compress_ptr cinfo)
-{
-    JPEGOutputBuffer* out = static_cast<JPEGOutputBuffer*>(cinfo->dest);
-    const size_t internalBufferSize = 8192;
-    out->buffer.resize(internalBufferSize);
-    out->next_output_byte = out->buffer.data();
-    out->free_in_buffer = out->buffer.size();
-}
-
-static boolean writeOutput(j_compress_ptr cinfo)
-{
-    JPEGOutputBuffer* out = static_cast<JPEGOutputBuffer*>(cinfo->dest);
-    out->output->append(out->buffer.data(), out->buffer.size());
-    out->next_output_byte = out->buffer.data();
-    out->free_in_buffer = out->buffer.size();
-    return TRUE;
-}
-
-static void finishOutput(j_compress_ptr cinfo)
-{
-    JPEGOutputBuffer* out = static_cast<JPEGOutputBuffer*>(cinfo->dest);
-    const size_t size = out->buffer.size() - out->free_in_buffer;
-    out->output->append(out->buffer.data(), size);
-}
-
-static void handleError(j_common_ptr common)
-{
-    jmp_buf* jumpBufferPtr = static_cast<jmp_buf*>(common->client_data);
-    longjmp(*jumpBufferPtr, -1);
-}
-
-static void preMultipliedBGRAtoRGB(const unsigned char* pixels, unsigned int pixelCount, unsigned char* output)
-{
-    const SkPMColor* input = reinterpret_cast_ptr<const SkPMColor*>(pixels);
-    for (; pixelCount-- > 0; ++input) {
-        *output++ = SkGetPackedR32(*input);
-        *output++ = SkGetPackedG32(*input);
-        *output++ = SkGetPackedB32(*input);
-    }
-}
-
-static void RGBAtoRGB(const unsigned char* pixels, unsigned int pixelCount, unsigned char* output)
-{
-    for (; pixelCount-- > 0; pixels += 4) {
-        // Do source-over composition on black.
-        unsigned char alpha = pixels[3];
-        if (alpha != 255) {
-            *output++ = SkMulDiv255Round(pixels[0], alpha);
-            *output++ = SkMulDiv255Round(pixels[1], alpha);
-            *output++ = SkMulDiv255Round(pixels[2], alpha);
-        } else {
-            *output++ = pixels[0];
-            *output++ = pixels[1];
-            *output++ = pixels[2];
-        }
-    }
-}
-
-static void disableSubsamplingForHighQuality(jpeg_compress_struct* cinfo, int quality)
-{
-    if (quality < 100)
-        return;
-
-    for (int i = 0; i < MAX_COMPONENTS; ++i) {
-        cinfo->comp_info[i].h_samp_factor = 1;
-        cinfo->comp_info[i].v_samp_factor = 1;
-    }
-}
-
-static bool encodePixels(IntSize imageSize, unsigned char* inputPixels, bool premultiplied, int quality, Vector<unsigned char>* output)
-{
-    JPEGOutputBuffer destination;
-    destination.output = output;
-    Vector<JSAMPLE> row;
-
-    jpeg_compress_struct cinfo;
-    jpeg_error_mgr error;
-    cinfo.err = jpeg_std_error(&error);
-    error.error_exit = handleError;
-    jmp_buf jumpBuffer;
-    cinfo.client_data = &jumpBuffer;
-
-    if (setjmp(jumpBuffer)) {
-        jpeg_destroy_compress(&cinfo);
-        return false;
-    }
-
-    jpeg_create_compress(&cinfo);
-    cinfo.dest = &destination;
-    cinfo.dest->init_destination = prepareOutput;
-    cinfo.dest->empty_output_buffer = writeOutput;
-    cinfo.dest->term_destination = finishOutput;
-
-    imageSize.clampNegativeToZero();
-    cinfo.image_height = imageSize.height();
-    cinfo.image_width = imageSize.width();
-
-#if defined(JCS_EXTENSIONS)
-    if (premultiplied) {
-        cinfo.in_color_space = SK_B32_SHIFT ? JCS_EXT_RGBX : JCS_EXT_BGRX;
-
-        cinfo.input_components = 4;
-
-        jpeg_set_defaults(&cinfo);
-        jpeg_set_quality(&cinfo, quality, TRUE);
-        disableSubsamplingForHighQuality(&cinfo, quality);
-        jpeg_start_compress(&cinfo, TRUE);
-
-        unsigned char* pixels = inputPixels;
-        const size_t pixelRowStride = cinfo.image_width * 4;
-        while (cinfo.next_scanline < cinfo.image_height) {
-            jpeg_write_scanlines(&cinfo, &pixels, 1);
-            pixels += pixelRowStride;
-        }
-
-        jpeg_finish_compress(&cinfo);
-        jpeg_destroy_compress(&cinfo);
-        return true;
-    }
-#endif
-
-    cinfo.in_color_space = JCS_RGB;
-    cinfo.input_components = 3;
-
-    void (*extractRowRGB)(const unsigned char*, unsigned int, unsigned char* output);
-    extractRowRGB = &RGBAtoRGB;
-    if (premultiplied)
-        extractRowRGB = &preMultipliedBGRAtoRGB;
-
-    jpeg_set_defaults(&cinfo);
-    jpeg_set_quality(&cinfo, quality, TRUE);
-    disableSubsamplingForHighQuality(&cinfo, quality);
-    jpeg_start_compress(&cinfo, TRUE);
-
-    unsigned char* pixels = inputPixels;
-    row.resize(cinfo.image_width * cinfo.input_components);
-    const size_t pixelRowStride = cinfo.image_width * 4;
-    while (cinfo.next_scanline < cinfo.image_height) {
-        JSAMPLE* rowData = row.data();
-        extractRowRGB(pixels, cinfo.image_width, rowData);
-        jpeg_write_scanlines(&cinfo, &rowData, 1);
-        pixels += pixelRowStride;
-    }
-
-    jpeg_finish_compress(&cinfo);
-    jpeg_destroy_compress(&cinfo);
-    return true;
-}
-
-bool JPEGImageEncoder::encode(const SkBitmap& bitmap, int quality, Vector<unsigned char>* output)
-{
-    SkAutoLockPixels bitmapLock(bitmap);
-
-    if (bitmap.config() != SkBitmap::kARGB_8888_Config || !bitmap.getPixels())
-        return false; // Only support 32 bit/pixel skia bitmaps.
-
-    return encodePixels(IntSize(bitmap.width(), bitmap.height()), static_cast<unsigned char *>(bitmap.getPixels()), true, quality, output);
-}
-
-bool JPEGImageEncoder::encode(const ImageDataBuffer& imageData, int quality, Vector<unsigned char>* output)
-{
-    return encodePixels(imageData.size(), imageData.data(), false, quality, output);
-}
-
-} // namespace WebCore