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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/wm/core/image_grid.h"
#include <algorithm>
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkXfermode.h"
#include "ui/compositor/dip_util.h"
#include "ui/compositor/paint_recorder.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/size_conversions.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/gfx/transform.h"
using std::max;
using std::min;
namespace wm {
namespace {
// Sets the scaling for the transform applied to a layer. The left, top,
// right and bottom layers are stretched to the height or width of the
// center image.
void ScaleWidth(gfx::Size center, ui::Layer* layer, gfx::Transform& transform) {
float layer_width = layer->bounds().width() * layer->device_scale_factor();
float scale = static_cast<float>(center.width()) / layer_width;
transform.Scale(scale, 1.0);
}
void ScaleHeight(gfx::Size center,
ui::Layer* layer,
gfx::Transform& transform) {
float layer_height = layer->bounds().height() * layer->device_scale_factor();
float scale = static_cast<float>(center.height()) / layer_height;
transform.Scale(1.0, scale);
}
// Returns the dimensions of |image| if non-NULL or gfx::Size(0, 0) otherwise.
gfx::Size GetImageSize(const gfx::Image* image) {
return image ? gfx::Size(image->ToImageSkia()->width(),
image->ToImageSkia()->height())
: gfx::Size();
}
// Returns true if |layer|'s bounds don't fit within |size|.
bool LayerExceedsSize(const ui::Layer* layer, const gfx::Size& size) {
return layer->bounds().width() > size.width() ||
layer->bounds().height() > size.height();
}
} // namespace
gfx::RectF ImageGrid::TestAPI::GetTransformedLayerBounds(
const ui::Layer& layer) {
gfx::RectF bounds = layer.bounds();
layer.transform().TransformRect(&bounds);
return bounds;
}
ImageGrid::ImageGrid()
: layer_(new ui::Layer(ui::LAYER_NOT_DRAWN)),
top_image_height_(0),
bottom_image_height_(0),
left_image_width_(0),
right_image_width_(0),
base_top_row_height_(0),
base_bottom_row_height_(0),
base_left_column_width_(0),
base_right_column_width_(0) {
}
ImageGrid::~ImageGrid() {
}
void ImageGrid::SetImages(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) {
SetImage(top_left_image, &top_left_layer_, &top_left_painter_, NONE);
SetImage(top_image, &top_layer_, &top_painter_, HORIZONTAL);
SetImage(top_right_image, &top_right_layer_, &top_right_painter_, NONE);
SetImage(left_image, &left_layer_, &left_painter_, VERTICAL);
SetImage(center_image, &center_layer_, &center_painter_, NONE);
SetImage(right_image, &right_layer_, &right_painter_, VERTICAL);
SetImage(bottom_left_image, &bottom_left_layer_, &bottom_left_painter_, NONE);
SetImage(bottom_image, &bottom_layer_, &bottom_painter_, HORIZONTAL);
SetImage(
bottom_right_image, &bottom_right_layer_, &bottom_right_painter_, NONE);
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();
base_top_row_height_ = max(GetImageSize(top_left_image).height(),
max(GetImageSize(top_image).height(),
GetImageSize(top_right_image).height()));
base_bottom_row_height_ = max(GetImageSize(bottom_left_image).height(),
max(GetImageSize(bottom_image).height(),
GetImageSize(bottom_right_image).height()));
base_left_column_width_ = max(GetImageSize(top_left_image).width(),
max(GetImageSize(left_image).width(),
GetImageSize(bottom_left_image).width()));
base_right_column_width_ = max(GetImageSize(top_right_image).width(),
max(GetImageSize(right_image).width(),
GetImageSize(bottom_right_image).width()));
// Invalidate previous |size_| so calls to SetSize() will recompute it.
size_.SetSize(0, 0);
}
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);
// 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(base_left_column_width_, size_.width() / 2);
const int right = min(base_right_column_width_, size_.width() - left);
const int top = min(base_top_row_height_, size_.height() / 2);
const int bottom = min(base_bottom_row_height_, size_.height() - top);
// The remaining space goes to the center image.
int center_width = std::max(size.width() - left - right, 0);
int center_height = std::max(size.height() - top - bottom, 0);
// At non-integer scale factors, the ratio of dimensions in DIP is not
// necessarily the same as the ratio in physical pixels due to rounding. Set
// the transform on each of the layers based on dimensions in pixels.
gfx::Size center_size_in_pixels = gfx::ToFlooredSize(gfx::ScaleSize(
gfx::Size(center_width, center_height), layer_->device_scale_factor()));
if (top_layer_.get()) {
if (center_width > 0) {
gfx::Transform transform;
transform.Translate(left, 0);
ScaleWidth(center_size_in_pixels, top_layer_.get(), transform);
top_layer_->SetTransform(transform);
}
top_layer_->SetVisible(center_width > 0);
}
if (bottom_layer_.get()) {
if (center_width > 0) {
gfx::Transform transform;
transform.Translate(
left, size.height() - bottom_layer_->bounds().height());
ScaleWidth(center_size_in_pixels, bottom_layer_.get(), transform);
bottom_layer_->SetTransform(transform);
}
bottom_layer_->SetVisible(center_width > 0);
}
if (left_layer_.get()) {
if (center_height > 0) {
gfx::Transform transform;
transform.Translate(0, top);
ScaleHeight(center_size_in_pixels, left_layer_.get(), transform);
left_layer_->SetTransform(transform);
}
left_layer_->SetVisible(center_height > 0);
}
if (right_layer_.get()) {
if (center_height > 0) {
gfx::Transform transform;
transform.Translate(
size.width() - right_layer_->bounds().width(), top);
ScaleHeight(center_size_in_pixels, right_layer_.get(), transform);
right_layer_->SetTransform(transform);
}
right_layer_->SetVisible(center_height > 0);
}
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()) {
gfx::Transform transform;
transform.Translate(size.width() - top_right_layer_->bounds().width(), 0.0);
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()) {
gfx::Transform transform;
transform.Translate(
0.0, 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()) {
gfx::Transform transform;
transform.Translate(
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) {
gfx::Transform transform;
transform.Translate(left, top);
transform.Scale(center_width / center_layer_->bounds().width(),
center_height / center_layer_->bounds().height());
center_layer_->SetTransform(transform);
}
center_layer_->SetVisible(center_width > 0 && center_height > 0);
}
}
void ImageGrid::SetContentBounds(const gfx::Rect& content_bounds) {
SetSize(gfx::Size(
content_bounds.width() + left_image_width_ + right_image_width_,
content_bounds.height() + top_image_height_ +
bottom_image_height_));
layer_->SetBounds(
gfx::Rect(content_bounds.x() - left_image_width_,
content_bounds.y() - top_image_height_,
layer_->bounds().width(),
layer_->bounds().height()));
}
void ImageGrid::ImagePainter::SetClipRect(const gfx::Rect& clip_rect,
ui::Layer* layer) {
if (clip_rect != clip_rect_) {
clip_rect_ = clip_rect;
layer->SchedulePaint(layer->bounds());
}
}
void ImageGrid::ImagePainter::OnPaintLayer(const ui::PaintContext& context) {
gfx::Size bounding_size(clip_rect_.right(), clip_rect_.bottom());
ui::PaintRecorder recorder(context, bounding_size);
if (!clip_rect_.IsEmpty())
recorder.canvas()->ClipRect(clip_rect_);
recorder.canvas()->DrawImageInt(image_, 0, 0);
}
void ImageGrid::ImagePainter::OnDelegatedFrameDamage(
const gfx::Rect& damage_rect_in_dip) {
}
void ImageGrid::ImagePainter::OnDeviceScaleFactorChanged(
float device_scale_factor) {
// Redrawing will take care of scale factor change.
}
base::Closure ImageGrid::ImagePainter::PrepareForLayerBoundsChange() {
return base::Closure();
}
void ImageGrid::SetImage(const gfx::Image* image,
scoped_ptr<ui::Layer>* layer_ptr,
scoped_ptr<ImagePainter>* painter_ptr,
ImageType type) {
// Minimum width (for HORIZONTAL) or height (for VERTICAL) of the
// |image| so that layers are scaled property if the device scale
// factor is non integral.
const int kMinimumSize = 20;
// Clean out old layers and painters.
if (layer_ptr->get())
layer_->Remove(layer_ptr->get());
layer_ptr->reset();
painter_ptr->reset();
// If we're not using an image, we're done.
if (!image)
return;
gfx::ImageSkia image_skia = image->AsImageSkia();
switch (type) {
case HORIZONTAL:
if (image_skia.width() < kMinimumSize) {
image_skia = gfx::ImageSkiaOperations::CreateResizedImage(
image_skia,
skia::ImageOperations::RESIZE_GOOD,
gfx::Size(kMinimumSize, image_skia.height()));
}
break;
case VERTICAL:
if (image_skia.height() < kMinimumSize) {
image_skia = gfx::ImageSkiaOperations::CreateResizedImage(
image_skia,
skia::ImageOperations::RESIZE_GOOD,
gfx::Size(image_skia.width(), kMinimumSize));
}
break;
case NONE:
break;
}
// Set up the new layer and painter.
layer_ptr->reset(new ui::Layer(ui::LAYER_TEXTURED));
const gfx::Size size = image_skia.size();
layer_ptr->get()->SetBounds(gfx::Rect(0, 0, size.width(), size.height()));
painter_ptr->reset(new ImagePainter(image_skia));
layer_ptr->get()->set_delegate(painter_ptr->get());
layer_ptr->get()->SetFillsBoundsOpaquely(false);
layer_ptr->get()->SetVisible(true);
layer_->Add(layer_ptr->get());
}
} // namespace wm