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// Copyright 2014 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/nine_image_painter.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/gfx/insets.h"
#include "ui/gfx/rect.h"
#include "ui/gfx/scoped_canvas.h"
namespace gfx {
NineImagePainter::NineImagePainter(const std::vector<ImageSkia>& images) {
DCHECK_EQ(arraysize(images_), images.size());
for (size_t i = 0; i < arraysize(images_); ++i)
images_[i] = images[i];
}
NineImagePainter::NineImagePainter(const ImageSkia& image,
const Insets& insets) {
DCHECK_GE(image.width(), insets.width());
DCHECK_GE(image.height(), insets.height());
// Extract subsets of the original image to match the |images_| format.
const int x[] =
{ 0, insets.left(), image.width() - insets.right(), image.width() };
const int y[] =
{ 0, insets.top(), image.height() - insets.bottom(), image.height() };
for (size_t j = 0; j < 3; ++j) {
for (size_t i = 0; i < 3; ++i) {
images_[i + j * 3] = ImageSkiaOperations::ExtractSubset(image,
Rect(x[i], y[j], x[i + 1] - x[i], y[j + 1] - y[j]));
}
}
}
NineImagePainter::~NineImagePainter() {
}
bool NineImagePainter::IsEmpty() const {
return images_[0].isNull();
}
Size NineImagePainter::GetMinimumSize() const {
return IsEmpty() ? Size() : Size(
images_[0].width() + images_[1].width() + images_[2].width(),
images_[0].height() + images_[3].height() + images_[6].height());
}
void NineImagePainter::Paint(Canvas* canvas, const Rect& bounds) {
if (IsEmpty())
return;
ScopedCanvas scoped_canvas(canvas);
canvas->Translate(bounds.OffsetFromOrigin());
// In case the corners and edges don't all have the same width/height, we draw
// the center first, and extend it out in all directions to the edges of the
// images with the smallest widths/heights. This way there will be no
// unpainted areas, though some corners or edges might overlap the center.
int w = bounds.width();
int i0w = images_[0].width();
int i2w = images_[2].width();
int i3w = images_[3].width();
int i5w = images_[5].width();
int i6w = images_[6].width();
int i8w = images_[8].width();
int i4x = std::min(std::min(i0w, i3w), i6w);
int i4w = w - i4x - std::min(std::min(i2w, i5w), i8w);
int h = bounds.height();
int i0h = images_[0].height();
int i1h = images_[1].height();
int i2h = images_[2].height();
int i6h = images_[6].height();
int i7h = images_[7].height();
int i8h = images_[8].height();
int i4y = std::min(std::min(i0h, i1h), i2h);
int i4h = h - i4y - std::min(std::min(i6h, i7h), i8h);
if (!images_[4].isNull())
Fill(canvas, images_[4], i4x, i4y, i4w, i4h);
canvas->DrawImageInt(images_[0], 0, 0);
Fill(canvas, images_[1], i0w, 0, w - i0w - i2w, i1h);
canvas->DrawImageInt(images_[2], w - i2w, 0);
Fill(canvas, images_[3], 0, i0h, i3w, h - i0h - i6h);
Fill(canvas, images_[5], w - i5w, i2h, i5w, h - i2h - i8h);
canvas->DrawImageInt(images_[6], 0, h - i6h);
Fill(canvas, images_[7], i6w, h - i7h, w - i6w - i8w, i7h);
canvas->DrawImageInt(images_[8], w - i8w, h - i8h);
}
// static
void NineImagePainter::Fill(Canvas* c,
const ImageSkia& i,
int x,
int y,
int w,
int h) {
c->DrawImageInt(i, 0, 0, i.width(), i.height(), x, y, w, h, false);
}
} // namespace gfx
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