Moving GraphicsContext and dependencies from core to platform.

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

-/*
- * Copyright (c) 2011, 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/WEBPImageEncoder.h"
-
-#include "SkBitmap.h"
-#include "core/platform/graphics/ImageBuffer.h"
-#include "platform/geometry/IntSize.h"
-#include "webp/encode.h"
-
-typedef int (*WebPImporter)(WebPPicture* const, const uint8_t* const data, int rowStride);
-
-namespace WebCore {
-
-static int writeOutput(const uint8_t* data, size_t size, const WebPPicture* const picture)
-{
-    static_cast<Vector<unsigned char>*>(picture->custom_ptr)->append(data, size);
-    return 1;
-}
-
-static bool rgbPictureImport(const unsigned char* pixels, bool premultiplied, WebPImporter importRGBX, WebPImporter importRGB, WebPPicture* picture)
-{
-    if (premultiplied)
-        return importRGBX(picture, pixels, picture->width * 4);
-
-    // Write the RGB pixels to an rgb data buffer, alpha premultiplied, then import the rgb data.
-
-    Vector<unsigned char> rgb;
-    size_t pixelCount = picture->height * picture->width;
-    rgb.reserveInitialCapacity(pixelCount * 3);
-
-    for (unsigned char* data = rgb.data(); pixelCount-- > 0; pixels += 4) {
-        unsigned char alpha = pixels[3];
-        if (alpha != 255) {
-            *data++ = SkMulDiv255Round(pixels[0], alpha);
-            *data++ = SkMulDiv255Round(pixels[1], alpha);
-            *data++ = SkMulDiv255Round(pixels[2], alpha);
-        } else {
-            *data++ = pixels[0];
-            *data++ = pixels[1];
-            *data++ = pixels[2];
-        }
-    }
-
-    return importRGB(picture, rgb.data(), picture->width * 3);
-}
-
-template <bool Premultiplied> inline bool importPictureBGRX(const unsigned char* pixels, WebPPicture* picture)
-{
-    return rgbPictureImport(pixels, Premultiplied, &WebPPictureImportBGRX, &WebPPictureImportBGR, picture);
-}
-
-template <bool Premultiplied> inline bool importPictureRGBX(const unsigned char* pixels, WebPPicture* picture)
-{
-    return rgbPictureImport(pixels, Premultiplied, &WebPPictureImportRGBX, &WebPPictureImportRGB, picture);
-}
-
-static bool encodePixels(IntSize imageSize, const unsigned char* pixels, bool premultiplied, int quality, Vector<unsigned char>* output)
-{
-    WebPConfig config;
-    if (!WebPConfigInit(&config))
-        return false;
-    WebPPicture picture;
-    if (!WebPPictureInit(&picture))
-        return false;
-
-    imageSize.clampNegativeToZero();
-    if (!imageSize.width() || imageSize.width() > WEBP_MAX_DIMENSION)
-        return false;
-    picture.width = imageSize.width();
-    if (!imageSize.height() || imageSize.height() > WEBP_MAX_DIMENSION)
-        return false;
-    picture.height = imageSize.height();
-
-    if (premultiplied && !importPictureBGRX<true>(pixels, &picture))
-        return false;
-    if (!premultiplied && !importPictureRGBX<false>(pixels, &picture))
-        return false;
-
-    picture.custom_ptr = output;
-    picture.writer = &writeOutput;
-    config.quality = quality;
-    config.method = 3;
-
-    bool success = WebPEncode(&config, &picture);
-    WebPPictureFree(&picture);
-    return success;
-}
-
-bool WEBPImageEncoder::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 WEBPImageEncoder::encode(const ImageDataBuffer& imageData, int quality, Vector<unsigned char>* output)
-{
-    return encodePixels(imageData.size(), imageData.data(), false, quality, output);
-}
-
-} // namespace WebCore