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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_skia.h"
#include <limits>
#include <cmath>
#include "base/logging.h"
#include "base/stl_util.h"
namespace gfx {
ImageSkia::ImageSkia(const SkBitmap* bitmap)
: size_(bitmap->width(), bitmap->height()),
mip_map_build_pending_(false) {
CHECK(bitmap);
// TODO(pkotwicz): Add a CHECK to ensure that !bitmap->isNull()
bitmaps_.push_back(bitmap);
}
ImageSkia::ImageSkia(const std::vector<const SkBitmap*>& bitmaps)
: bitmaps_(bitmaps),
mip_map_build_pending_(false) {
CHECK(!bitmaps_.empty());
// TODO(pkotwicz): Add a CHECK to ensure that !bitmap->isNull() for each
// vector element.
// Assume that the smallest bitmap represents 1x scale factor.
for (size_t i = 0; i < bitmaps_.size(); ++i) {
gfx::Size bitmap_size(bitmaps_[i]->width(), bitmaps_[i]->height());
if (size_.IsEmpty() || bitmap_size.GetArea() < size_.GetArea())
size_ = bitmap_size;
}
}
ImageSkia::~ImageSkia() {
STLDeleteElements(&bitmaps_);
}
void ImageSkia::BuildMipMap() {
mip_map_build_pending_ = true;
}
void ImageSkia::DrawToCanvasInt(gfx::Canvas* canvas, int x, int y) {
SkPaint p;
DrawToCanvasInt(canvas, x, y, p);
}
void ImageSkia::DrawToCanvasInt(gfx::Canvas* canvas,
int x, int y,
const SkPaint& paint) {
if (IsZeroSized())
return;
SkMatrix m = canvas->sk_canvas()->getTotalMatrix();
float scale_x = std::abs(SkScalarToFloat(m.getScaleX()));
float scale_y = std::abs(SkScalarToFloat(m.getScaleY()));
const SkBitmap* bitmap = GetBitmapForScale(scale_x, scale_y);
if (mip_map_build_pending_) {
const_cast<SkBitmap*>(bitmap)->buildMipMap();
mip_map_build_pending_ = false;
}
float bitmap_scale_x = static_cast<float>(bitmap->width()) / width();
float bitmap_scale_y = static_cast<float>(bitmap->height()) / height();
canvas->Save();
canvas->sk_canvas()->scale(1.0f / bitmap_scale_x,
1.0f / bitmap_scale_y);
canvas->sk_canvas()->drawBitmap(*bitmap, SkFloatToScalar(x * bitmap_scale_x),
SkFloatToScalar(y * bitmap_scale_y));
canvas->Restore();
}
void ImageSkia::DrawToCanvasInt(gfx::Canvas* canvas,
int src_x, int src_y, int src_w, int src_h,
int dest_x, int dest_y, int dest_w, int dest_h,
bool filter) {
SkPaint p;
DrawToCanvasInt(canvas, src_x, src_y, src_w, src_h, dest_x, dest_y,
dest_w, dest_h, filter, p);
}
void ImageSkia::DrawToCanvasInt(gfx::Canvas* canvas,
int src_x, int src_y, int src_w, int src_h,
int dest_x, int dest_y, int dest_w, int dest_h,
bool filter,
const SkPaint& paint) {
if (IsZeroSized())
return;
SkMatrix m = canvas->sk_canvas()->getTotalMatrix();
float scale_x = std::abs(SkScalarToFloat(m.getScaleX()));
float scale_y = std::abs(SkScalarToFloat(m.getScaleY()));
const SkBitmap* bitmap = GetBitmapForScale(scale_x, scale_y);
if (mip_map_build_pending_) {
const_cast<SkBitmap*>(bitmap)->buildMipMap();
mip_map_build_pending_ = false;
}
float bitmap_scale_x = static_cast<float>(bitmap->width()) / width();
float bitmap_scale_y = static_cast<float>(bitmap->height()) / height();
canvas->Save();
canvas->sk_canvas()->scale(1.0f / bitmap_scale_x,
1.0f / bitmap_scale_y);
canvas->DrawBitmapFloat(*bitmap,
src_x * bitmap_scale_x, src_y * bitmap_scale_x,
src_w * bitmap_scale_x, src_h * bitmap_scale_y,
dest_x * bitmap_scale_x, dest_y * bitmap_scale_y,
dest_w * bitmap_scale_x, dest_h * bitmap_scale_y,
filter, paint);
canvas->Restore();
}
const SkBitmap* ImageSkia::GetBitmapForScale(float x_scale_factor,
float y_scale_factor) const {
// Get the desired bitmap width and height given |x_scale_factor|,
// |y_scale_factor| and |size_| at 1x density.
float desired_width = size_.width() * x_scale_factor;
float desired_height = size_.height() * y_scale_factor;
size_t closest_index = 0;
float smallest_diff = std::numeric_limits<float>::max();
for (size_t i = 0; i < bitmaps_.size(); ++i) {
if (bitmaps_[i]->isNull())
continue;
float diff = std::abs(bitmaps_[i]->width() - desired_width) +
std::abs(bitmaps_[i]->height() - desired_height);
if (diff < smallest_diff) {
closest_index = i;
smallest_diff = diff;
}
}
return bitmaps_[closest_index];
}
} // namespace gfx
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