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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/image/image_util.h"
#include "base/memory/scoped_ptr.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/gfx/codec/jpeg_codec.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/image/image_skia.h"
namespace gfx {
const uint32_t kMinimumVisibleOpacity = 12;
// The iOS implementations of the JPEG functions are in image_util_ios.mm.
#if !defined(OS_IOS)
Image ImageFrom1xJPEGEncodedData(const unsigned char* input,
size_t input_size) {
scoped_ptr<SkBitmap> bitmap(gfx::JPEGCodec::Decode(input, input_size));
if (bitmap.get())
return Image::CreateFrom1xBitmap(*bitmap);
return Image();
}
bool JPEG1xEncodedDataFromImage(const Image& image, int quality,
std::vector<unsigned char>* dst) {
const gfx::ImageSkiaRep& image_skia_rep =
image.AsImageSkia().GetRepresentation(1.0f);
if (image_skia_rep.scale() != 1.0f)
return false;
const SkBitmap& bitmap = image_skia_rep.sk_bitmap();
SkAutoLockPixels bitmap_lock(bitmap);
if (!bitmap.readyToDraw())
return false;
return gfx::JPEGCodec::Encode(
reinterpret_cast<unsigned char*>(bitmap.getAddr32(0, 0)),
gfx::JPEGCodec::FORMAT_SkBitmap, bitmap.width(),
bitmap.height(),
static_cast<int>(bitmap.rowBytes()), quality,
dst);
}
#endif // !defined(OS_IOS)
bool VisibleMargins(const ImageSkia& image, int* leading, int* trailing) {
*leading = 0;
*trailing = std::max(1, image.width()) - 1;
if (!image.HasRepresentation(1.0))
return false;
const ImageSkiaRep& rep = image.GetRepresentation(1.0);
if (rep.is_null())
return false;
const SkBitmap& bitmap = rep.sk_bitmap();
if (bitmap.isNull() || bitmap.width() == 0)
return false;
if (bitmap.isOpaque())
return true;
SkAutoLockPixels l(bitmap);
int inner_min = bitmap.width();
for (int x = 0; x < bitmap.width(); ++x) {
for (int y = 0; y < bitmap.height(); ++y) {
if (SkColorGetA(bitmap.getColor(x, y)) > kMinimumVisibleOpacity) {
inner_min = x;
break;
}
}
if (inner_min < bitmap.width())
break;
}
int inner_max = -1;
for (int x = bitmap.width() - 1; x > inner_min; --x) {
for (int y = 0; y < bitmap.height(); ++y) {
if (SkColorGetA(bitmap.getColor(x, y)) > kMinimumVisibleOpacity) {
inner_max = x;
break;
}
}
if (inner_max > -1)
break;
}
if (inner_min == bitmap.width()) {
*leading = bitmap.width()/2;
*trailing = bitmap.width()/2 + 1;
return true;
}
*leading = inner_min;
*trailing = inner_max;
return true;
}
} // namespace gfx
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