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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 <limits>
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkRect.h"
#include "third_party/skia/include/core/SkScalar.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/insets.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rect_conversions.h"
#include "ui/gfx/geometry/safe_integer_conversions.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/gfx/scoped_canvas.h"
#include "ui/gfx/skia_util.h"
namespace gfx {
namespace {
// The following functions width and height of the image in pixels for the
// scale factor in the Canvas.
int ImageWidthInPixels(const ImageSkia& i, Canvas* c) {
if (i.isNull())
return 0;
return i.GetRepresentation(c->image_scale()).pixel_width();
}
int ImageHeightInPixels(const ImageSkia& i, Canvas* c) {
if (i.isNull())
return 0;
return i.GetRepresentation(c->image_scale()).pixel_height();
}
// Stretches the given image over the specified canvas area.
void Fill(Canvas* c,
const ImageSkia& i,
int x,
int y,
int w,
int h,
const SkPaint& paint) {
if (i.isNull())
return;
c->DrawImageIntInPixel(i, 0, 0, ImageWidthInPixels(i, c),
ImageHeightInPixels(i, c), x, y, w, h, false, paint);
}
} // namespace
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) {
// When no alpha value is specified, use default value of 100% opacity.
Paint(canvas, bounds, std::numeric_limits<uint8>::max());
}
void NineImagePainter::Paint(Canvas* canvas,
const Rect& bounds,
const uint8 alpha) {
if (IsEmpty())
return;
ScopedCanvas scoped_canvas(canvas);
canvas->Translate(bounds.OffsetFromOrigin());
// Get the current transform from the canvas and apply it to the logical
// bounds passed in. This will give us the pixel bounds which can be used
// to draw the images at the correct locations.
// We should not scale the bounds by the canvas->image_scale() as that can be
// different from the real scale in the canvas transform.
SkRect bounds_in_pixels_f;
if (!canvas->sk_canvas()->getTotalMatrix().mapRect(
&bounds_in_pixels_f, RectToSkRect(gfx::Rect(bounds.size()))))
return; // Invalid transform.
SkIRect bounds_in_pixels;
bounds_in_pixels_f.dround(&bounds_in_pixels);
SkMatrix matrix = canvas->sk_canvas()->getTotalMatrix();
matrix.setTranslateX(SkIntToScalar(bounds_in_pixels.x()));
matrix.setTranslateY(SkIntToScalar(bounds_in_pixels.y()));
canvas->sk_canvas()->setMatrix(matrix);
const int width_in_pixels = bounds_in_pixels.width();
const int height_in_pixels = bounds_in_pixels.height();
// 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 i0w = ImageWidthInPixels(images_[0], canvas);
int i2w = ImageWidthInPixels(images_[2], canvas);
int i3w = ImageWidthInPixels(images_[3], canvas);
int i5w = ImageWidthInPixels(images_[5], canvas);
int i6w = ImageWidthInPixels(images_[6], canvas);
int i8w = ImageWidthInPixels(images_[8], canvas);
int i4x = std::min(std::min(i0w, i3w), i6w);
int i4w = width_in_pixels - i4x - std::min(std::min(i2w, i5w), i8w);
int i0h = ImageHeightInPixels(images_[0], canvas);
int i1h = ImageHeightInPixels(images_[1], canvas);
int i2h = ImageHeightInPixels(images_[2], canvas);
int i6h = ImageHeightInPixels(images_[6], canvas);
int i7h = ImageHeightInPixels(images_[7], canvas);
int i8h = ImageHeightInPixels(images_[8], canvas);
int i4y = std::min(std::min(i0h, i1h), i2h);
int i4h = height_in_pixels - i4y - std::min(std::min(i6h, i7h), i8h);
SkPaint paint;
paint.setAlpha(alpha);
Fill(canvas, images_[4], i4x, i4y, i4w, i4h, paint);
canvas->DrawImageIntInPixel(images_[0], 0, 0, i0w, i0h,
0, 0, i0w, i0h, false, paint);
Fill(canvas, images_[1], i0w, 0, width_in_pixels - i0w - i2w, i1h, paint);
Fill(canvas, images_[2], width_in_pixels - i2w, 0, i2w, i2h, paint);
Fill(canvas, images_[3], 0, i0h, i3w, height_in_pixels - i0h - i6h, paint);
Fill(canvas, images_[5], width_in_pixels - i5w, i2h, i5w,
height_in_pixels - i2h - i8h, paint);
Fill(canvas, images_[6], 0, height_in_pixels - i6h, i6w, i6h, paint);
Fill(canvas, images_[7], i6w, height_in_pixels - i7h,
width_in_pixels - i6w - i8w, i7h, paint);
Fill(canvas, images_[8], width_in_pixels - i8w, height_in_pixels - i8h, i8w,
i8h, paint);
}
} // namespace gfx
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