| // 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/macros.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/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 { |
| |
| 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(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) { |
| 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 = ToRoundedInt(bounds.x() * scale); |
| const int top_in_pixels = ToRoundedInt(bounds.y() * scale); |
| const int right_in_pixels = ToRoundedInt(bounds.right() * scale); |
| const int bottom_in_pixels = ToRoundedInt(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(arraysize(image_reps) == arraysize(images_), ""); |
| for (size_t i = 0; i < arraysize(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(std::min(i0w, i3w), i6w); |
| int i4y = std::min(std::min(i0h, i1h), i2h); |
| int i4w = |
| std::max(width_in_pixels - i4x - std::min(std::min(i2w, i5w), i8w), 0); |
| int i4h = |
| std::max(height_in_pixels - i4y - std::min(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 |