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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 <stdint.h>
#include <algorithm>
#include "base/memory/scoped_ptr.h"
#include "build/build_config.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 {
// Returns whether column |x| of |bitmap| has any "visible pixels", where
// "visible" is defined as having an opactiy greater than an arbitrary small
// value.
bool ColumnHasVisiblePixels(const SkBitmap& bitmap, int x) {
const SkAlpha kMinimumVisibleOpacity = 12;
for (int y = 0; y < bitmap.height(); ++y) {
if (SkColorGetA(bitmap.getColor(x, y)) > kMinimumVisibleOpacity)
return true;
}
return false;
}
} // namespace
namespace gfx {
// 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)
void GetVisibleMargins(const ImageSkia& image, int* left, int* right) {
*left = 0;
*right = 0;
if (!image.HasRepresentation(1.f))
return;
const SkBitmap& bitmap = image.GetRepresentation(1.f).sk_bitmap();
if (bitmap.drawsNothing() || bitmap.isOpaque())
return;
SkAutoLockPixels lock(bitmap);
int x = 0;
for (; x < bitmap.width(); ++x) {
if (ColumnHasVisiblePixels(bitmap, x)) {
*left = x;
break;
}
}
if (x == bitmap.width()) {
// Image is fully transparent. Divide the width in half, giving the leading
// region the extra pixel for odd widths.
*left = (bitmap.width() + 1) / 2;
*right = bitmap.width() - *left;
return;
}
// Since we already know column *left is non-transparent, we can avoid
// rechecking that column; hence the '>' here.
for (x = bitmap.width() - 1; x > *left; --x) {
if (ColumnHasVisiblePixels(bitmap, x))
break;
}
*right = bitmap.width() - 1 - x;
}
} // namespace gfx
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