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// Copyright (c) 2011 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 "ash/wm/image_grid.h"
#include <algorithm>
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/transform.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkXfermode.h"
using std::max;
using std::min;
namespace ash {
namespace internal {
gfx::Rect ImageGrid::TestAPI::GetTransformedLayerBounds(
const ui::Layer& layer) {
gfx::Rect bounds = layer.bounds();
layer.transform().TransformRect(&bounds);
return bounds;
}
ImageGrid::ImageGrid()
: top_image_height_(0),
bottom_image_height_(0),
left_image_width_(0),
right_image_width_(0),
top_row_height_(0),
bottom_row_height_(0),
left_column_width_(0),
right_column_width_(0) {
}
ImageGrid::~ImageGrid() {
}
void ImageGrid::Init(const gfx::Image* top_left_image,
const gfx::Image* top_image,
const gfx::Image* top_right_image,
const gfx::Image* left_image,
const gfx::Image* center_image,
const gfx::Image* right_image,
const gfx::Image* bottom_left_image,
const gfx::Image* bottom_image,
const gfx::Image* bottom_right_image) {
layer_.reset(new ui::Layer(ui::Layer::LAYER_HAS_NO_TEXTURE));
InitImage(top_left_image, &top_left_layer_, &top_left_painter_);
InitImage(top_image, &top_layer_, &top_painter_);
InitImage(top_right_image, &top_right_layer_, &top_right_painter_);
InitImage(left_image, &left_layer_, &left_painter_);
InitImage(center_image, ¢er_layer_, ¢er_painter_);
InitImage(right_image, &right_layer_, &right_painter_);
InitImage(bottom_left_image, &bottom_left_layer_, &bottom_left_painter_);
InitImage(bottom_image, &bottom_layer_, &bottom_painter_);
InitImage(bottom_right_image, &bottom_right_layer_, &bottom_right_painter_);
top_image_height_ = GetImageSize(top_image).height();
bottom_image_height_ = GetImageSize(bottom_image).height();
left_image_width_ = GetImageSize(left_image).width();
right_image_width_ = GetImageSize(right_image).width();
top_row_height_ = max(GetImageSize(top_left_image).height(),
max(GetImageSize(top_image).height(),
GetImageSize(top_right_image).height()));
bottom_row_height_ = max(GetImageSize(bottom_left_image).height(),
max(GetImageSize(bottom_image).height(),
GetImageSize(bottom_right_image).height()));
left_column_width_ = max(GetImageSize(top_left_image).width(),
max(GetImageSize(left_image).width(),
GetImageSize(bottom_left_image).width()));
right_column_width_ = max(GetImageSize(top_right_image).width(),
max(GetImageSize(right_image).width(),
GetImageSize(bottom_right_image).width()));
}
void ImageGrid::SetSize(const gfx::Size& size) {
if (size_ == size)
return;
size_ = size;
gfx::Rect updated_bounds = layer_->bounds();
updated_bounds.set_size(size);
layer_->SetBounds(updated_bounds);
float center_width = size.width() - left_column_width_ - right_column_width_;
float center_height = size.height() - top_row_height_ - bottom_row_height_;
if (top_layer_.get()) {
if (center_width > 0) {
ui::Transform transform;
transform.SetScaleX(center_width / top_layer_->bounds().width());
transform.ConcatTranslate(left_column_width_, 0);
top_layer_->SetTransform(transform);
}
top_layer_->SetVisible(center_width > 0);
}
if (bottom_layer_.get()) {
if (center_width > 0) {
ui::Transform transform;
transform.SetScaleX(center_width / bottom_layer_->bounds().width());
transform.ConcatTranslate(
left_column_width_, size.height() - bottom_layer_->bounds().height());
bottom_layer_->SetTransform(transform);
}
bottom_layer_->SetVisible(center_width > 0);
}
if (left_layer_.get()) {
if (center_height > 0) {
ui::Transform transform;
transform.SetScaleY(center_height / left_layer_->bounds().height());
transform.ConcatTranslate(0, top_row_height_);
left_layer_->SetTransform(transform);
}
left_layer_->SetVisible(center_height > 0);
}
if (right_layer_.get()) {
if (center_height > 0) {
ui::Transform transform;
transform.SetScaleY(center_height / right_layer_->bounds().height());
transform.ConcatTranslate(
size.width() - right_layer_->bounds().width(), top_row_height_);
right_layer_->SetTransform(transform);
}
right_layer_->SetVisible(center_height > 0);
}
// Calculate the available amount of space for corner images on all sides of
// the grid. If the images don't fit, we need to clip them.
const int left = min(left_column_width_, size_.width() / 2);
const int right = min(right_column_width_, size_.width() - left);
const int top = min(top_row_height_, size_.height() / 2);
const int bottom = min(bottom_row_height_, size_.height() - top);
if (top_left_layer_.get()) {
// No transformation needed; it should be at (0, 0) and unscaled.
top_left_painter_->SetClipRect(
LayerExceedsSize(top_left_layer_.get(), gfx::Size(left, top)) ?
gfx::Rect(gfx::Rect(0, 0, left, top)) :
gfx::Rect(),
top_left_layer_.get());
}
if (top_right_layer_.get()) {
ui::Transform transform;
transform.SetTranslateX(size.width() - top_right_layer_->bounds().width());
top_right_layer_->SetTransform(transform);
top_right_painter_->SetClipRect(
LayerExceedsSize(top_right_layer_.get(), gfx::Size(right, top)) ?
gfx::Rect(top_right_layer_->bounds().width() - right, 0,
right, top) :
gfx::Rect(),
top_right_layer_.get());
}
if (bottom_left_layer_.get()) {
ui::Transform transform;
transform.SetTranslateY(
size.height() - bottom_left_layer_->bounds().height());
bottom_left_layer_->SetTransform(transform);
bottom_left_painter_->SetClipRect(
LayerExceedsSize(bottom_left_layer_.get(), gfx::Size(left, bottom)) ?
gfx::Rect(0, bottom_left_layer_->bounds().height() - bottom,
left, bottom) :
gfx::Rect(),
bottom_left_layer_.get());
}
if (bottom_right_layer_.get()) {
ui::Transform transform;
transform.SetTranslate(
size.width() - bottom_right_layer_->bounds().width(),
size.height() - bottom_right_layer_->bounds().height());
bottom_right_layer_->SetTransform(transform);
bottom_right_painter_->SetClipRect(
LayerExceedsSize(bottom_right_layer_.get(), gfx::Size(right, bottom)) ?
gfx::Rect(bottom_right_layer_->bounds().width() - right,
bottom_right_layer_->bounds().height() - bottom,
right, bottom) :
gfx::Rect(),
bottom_right_layer_.get());
}
if (center_layer_.get()) {
if (center_width > 0 && center_height > 0) {
ui::Transform transform;
transform.SetScale(center_width / center_layer_->bounds().width(),
center_height / center_layer_->bounds().height());
transform.ConcatTranslate(left_column_width_, top_row_height_);
center_layer_->SetTransform(transform);
}
center_layer_->SetVisible(center_width > 0 && center_height > 0);
}
}
void ImageGrid::ImagePainter::SetClipRect(const gfx::Rect& clip_rect,
ui::Layer* layer) {
if (clip_rect != clip_rect_) {
clip_rect_ = clip_rect;
layer->ScheduleDraw();
}
}
void ImageGrid::ImagePainter::OnPaintLayer(gfx::Canvas* canvas) {
if (!clip_rect_.IsEmpty())
canvas->ClipRect(clip_rect_);
canvas->DrawBitmapInt(*(image_->ToSkBitmap()), 0, 0);
}
// static
gfx::Size ImageGrid::GetImageSize(const gfx::Image* image) {
return image ?
gfx::Size(image->ToSkBitmap()->width(), image->ToSkBitmap()->height()) :
gfx::Size();
}
// static
bool ImageGrid::LayerExceedsSize(const ui::Layer* layer,
const gfx::Size& size) {
return layer->bounds().width() > size.width() ||
layer->bounds().height() > size.height();
}
void ImageGrid::InitImage(const gfx::Image* image,
scoped_ptr<ui::Layer>* layer_ptr,
scoped_ptr<ImagePainter>* painter_ptr) {
if (!image)
return;
layer_ptr->reset(new ui::Layer(ui::Layer::LAYER_HAS_TEXTURE));
const gfx::Size size = GetImageSize(image);
layer_ptr->get()->SetBounds(gfx::Rect(0, 0, size.width(), size.height()));
painter_ptr->reset(new ImagePainter(image));
layer_ptr->get()->set_delegate(painter_ptr->get());
layer_ptr->get()->SetFillsBoundsOpaquely(false);
layer_ptr->get()->SetVisible(true);
layer_->Add(layer_ptr->get());
}
} // namespace internal
} // namespace ash
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