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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/354829279): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "ui/gfx/nine_image_painter.h"
#include <stddef.h>
#include <array>
#include <limits>
#include "base/numerics/safe_conversions.h"
#include "cc/paint/paint_flags.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/skia_conversions.h"
#include "ui/gfx/image/image_skia_operations.h"
#include "ui/gfx/image/image_skia_rep.h"
#include "ui/gfx/scoped_canvas.h"
namespace gfx {
namespace {
int ImageRepWidthInPixels(const ImageSkiaRep& rep) {
if (rep.is_null())
return 0;
return rep.pixel_width();
}
int ImageRepHeightInPixels(const ImageSkiaRep& rep) {
if (rep.is_null())
return 0;
return rep.pixel_height();
}
void Fill(Canvas* c,
const ImageSkiaRep& rep,
int x,
int y,
int w,
int h,
const cc::PaintFlags& flags) {
if (rep.is_null())
return;
c->DrawImageIntInPixel(rep, x, y, w, h, false, flags);
}
} // namespace
NineImagePainter::NineImagePainter(const std::vector<ImageSkia>& images) {
DCHECK_EQ(std::size(images_), images.size());
for (size_t i = 0; i < std::size(images_); ++i)
images_[i] = images[i];
}
NineImagePainter::NineImagePainter(const ImageSkia& image,
const Insets& insets) {
std::vector<gfx::Rect> regions;
GetSubsetRegions(image, insets, ®ions);
DCHECK_EQ(9u, regions.size());
for (size_t i = 0; i < 9; ++i)
images_[i] = ImageSkiaOperations::ExtractSubset(image, regions[i]);
}
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_t>::max());
}
void NineImagePainter::Paint(Canvas* canvas,
const Rect& bounds,
const uint8_t alpha) {
if (IsEmpty())
return;
ScopedCanvas scoped_canvas(canvas);
// Painting and doing layout at physical device pixels to avoid cracks or
// overlap.
const float scale = canvas->UndoDeviceScaleFactor();
// Since the drawing from the following Fill() calls assumes the mapped origin
// is at (0,0), we need to translate the canvas to the mapped origin.
const int left_in_pixels = base::ClampRound(bounds.x() * scale);
const int top_in_pixels = base::ClampRound(bounds.y() * scale);
const int right_in_pixels = base::ClampRound(bounds.right() * scale);
const int bottom_in_pixels = base::ClampRound(bounds.bottom() * scale);
const int width_in_pixels = right_in_pixels - left_in_pixels;
const int height_in_pixels = bottom_in_pixels - top_in_pixels;
// Since the drawing from the following Fill() calls assumes the mapped origin
// is at (0,0), we need to translate the canvas to the mapped origin.
canvas->Translate(gfx::Vector2d(left_in_pixels, top_in_pixels));
std::array<ImageSkiaRep, 9> image_reps;
static_assert(std::size(image_reps) == std::extent<decltype(images_)>(), "");
for (size_t i = 0; i < std::size(image_reps); ++i) {
image_reps[i] = images_[i].GetRepresentation(scale);
DCHECK(image_reps[i].is_null() || image_reps[i].scale() == scale);
}
// 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 = ImageRepWidthInPixels(image_reps[0]);
int i2w = ImageRepWidthInPixels(image_reps[2]);
int i3w = ImageRepWidthInPixels(image_reps[3]);
int i5w = ImageRepWidthInPixels(image_reps[5]);
int i6w = ImageRepWidthInPixels(image_reps[6]);
int i8w = ImageRepWidthInPixels(image_reps[8]);
int i0h = ImageRepHeightInPixels(image_reps[0]);
int i1h = ImageRepHeightInPixels(image_reps[1]);
int i2h = ImageRepHeightInPixels(image_reps[2]);
int i6h = ImageRepHeightInPixels(image_reps[6]);
int i7h = ImageRepHeightInPixels(image_reps[7]);
int i8h = ImageRepHeightInPixels(image_reps[8]);
i0w = std::min(i0w, width_in_pixels);
i2w = std::min(i2w, width_in_pixels - i0w);
i3w = std::min(i3w, width_in_pixels);
i5w = std::min(i5w, width_in_pixels - i3w);
i6w = std::min(i6w, width_in_pixels);
i8w = std::min(i8w, width_in_pixels - i6w);
i0h = std::min(i0h, height_in_pixels);
i1h = std::min(i1h, height_in_pixels);
i2h = std::min(i2h, height_in_pixels);
i6h = std::min(i6h, height_in_pixels - i0h);
i7h = std::min(i7h, height_in_pixels - i1h);
i8h = std::min(i8h, height_in_pixels - i2h);
int i4x = std::min({i0w, i3w, i6w});
int i4y = std::min({i0h, i1h, i2h});
int i4w = std::max(width_in_pixels - i4x - std::min({i2w, i5w, i8w}), 0);
int i4h = std::max(height_in_pixels - i4y - std::min({i6h, i7h, i8h}), 0);
cc::PaintFlags flags;
flags.setAlphaf(alpha / 255.0f);
Fill(canvas, image_reps[4], i4x, i4y, i4w, i4h, flags);
Fill(canvas, image_reps[0], 0, 0, i0w, i0h, flags);
Fill(canvas, image_reps[1], i0w, 0, width_in_pixels - i0w - i2w, i1h, flags);
Fill(canvas, image_reps[2], width_in_pixels - i2w, 0, i2w, i2h, flags);
Fill(canvas, image_reps[3], 0, i0h, i3w, height_in_pixels - i0h - i6h, flags);
Fill(canvas, image_reps[5], width_in_pixels - i5w, i2h, i5w,
height_in_pixels - i2h - i8h, flags);
Fill(canvas, image_reps[6], 0, height_in_pixels - i6h, i6w, i6h, flags);
Fill(canvas, image_reps[7], i6w, height_in_pixels - i7h,
width_in_pixels - i6w - i8w, i7h, flags);
Fill(canvas, image_reps[8], width_in_pixels - i8w, height_in_pixels - i8h,
i8w, i8h, flags);
}
// static
void NineImagePainter::GetSubsetRegions(const ImageSkia& image,
const Insets& insets,
std::vector<Rect>* regions) {
DCHECK_GE(image.width(), insets.width());
DCHECK_GE(image.height(), insets.height());
std::vector<Rect> result(9);
const auto x = std::to_array<int>({
0,
insets.left(),
image.width() - insets.right(),
image.width(),
});
const auto y = std::to_array<int>({
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) {
result[i + j * 3] = Rect(x[i], y[j], x[i + 1] - x[i], y[j + 1] - y[j]);
}
}
result.swap(*regions);
}
} // namespace gfx
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