123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197 |
- // 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 <stddef.h>
- #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));
- ImageSkiaRep image_reps[9];
- 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.setAlpha(alpha);
- 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 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) {
- result[i + j * 3] = Rect(x[i], y[j], x[i + 1] - x[i], y[j + 1] - y[j]);
- }
- }
- result.swap(*regions);
- }
- } // namespace gfx
|