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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/views/painter.h"
#include "base/logging.h"
#include "third_party/skia/include/effects/SkGradientShader.h"
#include "ui/base/resource/resource_bundle.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image.h"
#include "ui/gfx/image/image_skia.h"
#include "ui/gfx/insets.h"
#include "ui/gfx/point.h"
#include "ui/gfx/rect.h"
namespace views {
namespace {
class GradientPainter : public Painter {
public:
GradientPainter(bool horizontal, SkColor top, SkColor bottom)
: horizontal_(horizontal) {
colors_[0] = top;
colors_[1] = bottom;
}
virtual ~GradientPainter() {
}
// Overridden from Painter:
virtual void Paint(gfx::Canvas* canvas, const gfx::Size& size) OVERRIDE {
SkPaint paint;
SkPoint p[2];
p[0].iset(0, 0);
if (horizontal_)
p[1].iset(size.width(), 0);
else
p[1].iset(0, size.height());
SkShader* s = SkGradientShader::CreateLinear(p, colors_, NULL, 2,
SkShader::kClamp_TileMode, NULL);
paint.setStyle(SkPaint::kFill_Style);
paint.setShader(s);
// Need to unref shader, otherwise never deleted.
s->unref();
canvas->sk_canvas()->drawRectCoords(SkIntToScalar(0), SkIntToScalar(0),
SkIntToScalar(size.width()),
SkIntToScalar(size.height()), paint);
}
private:
bool horizontal_;
SkColor colors_[2];
DISALLOW_COPY_AND_ASSIGN(GradientPainter);
};
class ImagePainter : public Painter {
public:
ImagePainter(const gfx::ImageSkia& image,
const gfx::Insets& insets,
bool paint_center)
: image_(image),
insets_(insets),
paint_center_(paint_center) {
DCHECK(image.width() > insets.width() &&
image.height() > insets.height());
}
// Paints the images.
virtual void Paint(gfx::Canvas* canvas, const gfx::Size& size) OVERRIDE {
if (size.width() == image_.width() && size.height() == image_.height()) {
// Early out if the size we're to render at equals the size of the image.
canvas->DrawImageInt(image_, 0, 0);
return;
}
// Upper left.
canvas->DrawImageInt(image_, 0, 0, insets_.left(), insets_.top(),
0, 0, insets_.left(), insets_.top(), true);
// Top edge.
canvas->DrawImageInt(
image_,
insets_.left(), 0, image_.width() - insets_.width(), insets_.top(),
insets_.left(), 0, size.width() - insets_.width(), insets_.top(), true);
// Upper right.
canvas->DrawImageInt(
image_,
image_.width() - insets_.right(), 0, insets_.right(), insets_.top(),
size.width() - insets_.right(), 0, insets_.right(), insets_.top(),
true);
// Right edge.
canvas->DrawImageInt(
image_,
image_.width() - insets_.right(), insets_.top(),
insets_.right(), image_.height() - insets_.height(),
size.width() - insets_.right(), insets_.top(), insets_.right(),
size.height() - insets_.height(), true);
// Bottom right.
canvas->DrawImageInt(
image_,
image_.width() - insets_.right(), image_.height() - insets_.bottom(),
insets_.right(), insets_.bottom(),
size.width() - insets_.right(),
size.height() - insets_.bottom(), insets_.right(),
insets_.bottom(), true);
// Bottom edge.
canvas->DrawImageInt(
image_,
insets_.left(), image_.height() - insets_.bottom(),
image_.width() - insets_.width(), insets_.bottom(),
insets_.left(), size.height() - insets_.bottom(),
size.width() - insets_.width(),
insets_.bottom(), true);
// Bottom left.
canvas->DrawImageInt(
image_,
0, image_.height() - insets_.bottom(), insets_.left(),
insets_.bottom(),
0, size.height() - insets_.bottom(), insets_.left(), insets_.bottom(),
true);
// Left.
canvas->DrawImageInt(
image_,
0, insets_.top(), insets_.left(), image_.height() - insets_.height(),
0, insets_.top(), insets_.left(), size.height() - insets_.height(),
true);
// Center.
if (paint_center_) {
canvas->DrawImageInt(
image_,
insets_.left(), insets_.top(),
image_.width() - insets_.width(), image_.height() - insets_.height(),
insets_.left(), insets_.top(),
size.width() - insets_.width(), size.height() - insets_.height(),
true);
}
}
private:
const gfx::ImageSkia image_;
const gfx::Insets insets_;
bool paint_center_;
DISALLOW_COPY_AND_ASSIGN(ImagePainter);
};
} // namespace
// static
void Painter::PaintPainterAt(gfx::Canvas* canvas,
Painter* painter,
const gfx::Rect& rect) {
DCHECK(canvas && painter);
canvas->Save();
canvas->Translate(rect.origin());
painter->Paint(canvas, rect.size());
canvas->Restore();
}
// static
Painter* Painter::CreateHorizontalGradient(SkColor c1, SkColor c2) {
return new GradientPainter(true, c1, c2);
}
// static
Painter* Painter::CreateVerticalGradient(SkColor c1, SkColor c2) {
return new GradientPainter(false, c1, c2);
}
// static
Painter* Painter::CreateImagePainter(const gfx::ImageSkia& image,
const gfx::Insets& insets,
bool paint_center) {
return new ImagePainter(image, insets, paint_center);
}
HorizontalPainter::HorizontalPainter(const int image_resource_names[]) {
ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
for (int i = 0; i < 3; ++i)
images_[i] = rb.GetImageNamed(image_resource_names[i]).ToImageSkia();
height_ = images_[LEFT]->height();
DCHECK(images_[LEFT]->height() == images_[RIGHT]->height() &&
images_[LEFT]->height() == images_[CENTER]->height());
}
void HorizontalPainter::Paint(gfx::Canvas* canvas, const gfx::Size& size) {
if (size.width() < (images_[LEFT]->width() + images_[CENTER]->width() +
images_[RIGHT]->width())) {
// No room to paint.
return;
}
canvas->DrawImageInt(*images_[LEFT], 0, 0);
canvas->DrawImageInt(*images_[RIGHT],
size.width() - images_[RIGHT]->width(), 0);
canvas->TileImageInt(*images_[CENTER], images_[LEFT]->width(), 0,
size.width() - images_[LEFT]->width() - images_[RIGHT]->width(), height_);
}
} // namespace views
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