| // 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 calculate width and height of the image in pixels |
| // for the scale factor. |
| int ImageWidthInPixels(const ImageSkia& i, float scale) { |
| if (i.isNull()) |
| return 0; |
| ImageSkiaRep image_rep = i.GetRepresentation(scale); |
| return image_rep.pixel_width() * scale / image_rep.scale(); |
| } |
| |
| int ImageHeightInPixels(const ImageSkia& i, float scale) { |
| if (i.isNull()) |
| return 0; |
| ImageSkiaRep image_rep = i.GetRepresentation(scale); |
| return image_rep.pixel_height() * scale / image_rep.scale(); |
| } |
| |
| // 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->image_scale()), |
| ImageHeightInPixels(i, c->image_scale()), |
| 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) { |
| 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>::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(); |
| const float scale_x = matrix.getScaleX(); |
| const float scale_y = matrix.getScaleY(); |
| |
| // 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], scale_x); |
| int i2w = ImageWidthInPixels(images_[2], scale_x); |
| int i3w = ImageWidthInPixels(images_[3], scale_x); |
| int i5w = ImageWidthInPixels(images_[5], scale_x); |
| int i6w = ImageWidthInPixels(images_[6], scale_x); |
| int i8w = ImageWidthInPixels(images_[8], scale_x); |
| |
| int i0h = ImageHeightInPixels(images_[0], scale_y); |
| int i1h = ImageHeightInPixels(images_[1], scale_y); |
| int i2h = ImageHeightInPixels(images_[2], scale_y); |
| int i6h = ImageHeightInPixels(images_[6], scale_y); |
| int i7h = ImageHeightInPixels(images_[7], scale_y); |
| int i8h = ImageHeightInPixels(images_[8], scale_y); |
| |
| bool has_room_for_border = |
| i0w + i2w <= width_in_pixels && i3w + i5w <= width_in_pixels && |
| i6w + i8w <= width_in_pixels && i0h + i6h <= height_in_pixels && |
| i1h + i7h <= height_in_pixels && i2h + i8h <= height_in_pixels; |
| |
| int i4x = has_room_for_border ? std::min(std::min(i0w, i3w), i6w) : 0; |
| int i4w = width_in_pixels - |
| (has_room_for_border ? i4x + std::min(std::min(i2w, i5w), i8w) : 0); |
| |
| int i4y = has_room_for_border ? std::min(std::min(i0h, i1h), i2h) : 0; |
| int i4h = height_in_pixels - |
| (has_room_for_border ? i4y + std::min(std::min(i6h, i7h), i8h) : 0); |
| |
| SkPaint paint; |
| paint.setAlpha(alpha); |
| |
| Fill(canvas, images_[4], i4x, i4y, i4w, i4h, paint); |
| |
| if (!has_room_for_border) |
| return; |
| |
| Fill(canvas, images_[0], 0, 0, i0w, i0h, 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); |
| } |
| |
| // 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 |