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// Copyright 2016 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.
#ifndef CC_LAYERS_NINE_PATCH_GENERATOR_H_
#define CC_LAYERS_NINE_PATCH_GENERATOR_H_
#include <string>
#include <vector>
#include "cc/cc_export.h"
#include "cc/resources/ui_resource_client.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/size.h"
namespace base {
class DictionaryValue;
}
namespace viz {
class RenderPass;
class SharedQuadState;
} // namespace viz
namespace cc {
class LayerImpl;
class CC_EXPORT NinePatchGenerator {
public:
class Patch {
public:
Patch(const gfx::RectF& image_rect,
const gfx::Size& total_image_bounds,
const gfx::RectF& output_rect);
gfx::RectF image_rect;
gfx::RectF normalized_image_rect;
gfx::RectF output_rect;
};
NinePatchGenerator();
// The bitmap stretches out the bounds of the layer. The following picture
// illustrates the parameters associated with the dimensions.
//
// Layer space layout
//
// --------------------------------
// | : : |
// | J C |
// | : : |
// | ------------------ |
// | | : | |
// |~~~I~~| ------------ | |
// | | | | | |
// | | | | | |
// |~~~A~~|~~| |~~|~B~~~~|
// | | | | | |
// | L ------------ | |
// | | : | |
// | ---K-------------- |
// | D |
// | : |
// | : |
// --------------------------------
//
// Bitmap space layout
//
// ~~~~~~~~~~ W ~~~~~~~~~~
// : : |
// : Y |
// : : |
// :~~X~~------------ |
// : | : |
// : | : |
// H | Q |
// : | : |
// : ~~~~~P~~~~~ |
// : |
// : |
// : |
// ------------------------
//
// |image_bounds| = (W, H)
// |image_aperture| = (X, Y, P, Q)
// |border| = (A, C, A + B, C + D)
// |occlusion_rectangle| = (I, J, K, L)
// |fill_center| indicates whether to draw the center quad or not.
bool SetLayout(const gfx::Size& image_bounds,
const gfx::Size& output_bounds,
const gfx::Rect& image_aperture,
const gfx::Rect& border,
const gfx::Rect& output_occlusion,
bool fill_center,
bool nearest_neighbor);
std::vector<Patch> GeneratePatches() const;
void AppendQuads(LayerImpl* layer_impl,
UIResourceId ui_resource_id,
viz::RenderPass* render_pass,
viz::SharedQuadState* shared_quad_state,
const std::vector<Patch>& patches);
void AsJson(base::DictionaryValue* dictionary) const;
void CheckGeometryLimitations();
private:
std::vector<Patch> ComputeQuadsWithOcclusion() const;
std::vector<Patch> ComputeQuadsWithoutOcclusion() const;
// The center patch in image space.
gfx::Rect image_aperture_;
// An inset border that the patches will be mapped to.
gfx::Rect border_;
gfx::Size image_bounds_;
gfx::Size output_bounds_;
bool fill_center_;
bool nearest_neighbor_;
gfx::Rect output_occlusion_;
};
} // namespace cc
#endif // CC_LAYERS_NINE_PATCH_GENERATOR_H_
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