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/*
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef mozilla_HwcUtils
#define mozilla_HwcUtils
#include "Layers.h"
#include <vector>
#include "hardware/hwcomposer.h"
namespace mozilla {
namespace gfx {
class Matrix;
}
class HwcUtils {
public:
enum {
HWC_USE_GPU = HWC_FRAMEBUFFER,
HWC_USE_OVERLAY = HWC_OVERLAY,
HWC_USE_COPYBIT
};
// HWC layer flags
enum {
// Draw a solid color rectangle
// The color should be set on the transform member of the hwc_layer_t struct
// The expected format is a 32 bit ABGR with 8 bits per component
HWC_COLOR_FILL = 0x8,
// Swap the RB pixels of gralloc buffer, like RGBA<->BGRA or RGBX<->BGRX
// The flag will be set inside LayerRenderState
HWC_FORMAT_RB_SWAP = 0x40
};
typedef std::vector<hwc_rect_t> RectVector;
/* Utility functions - implemented in HwcUtils.cpp */
/**
* Calculates the layer's clipping rectangle
*
* @param aTransform Input. A transformation matrix
* It transforms the clip rect to screen space
* @param aLayerClip Input. The layer's internal clipping rectangle.
* This may be NULL which means the layer has no internal clipping
* The origin is the top-left corner of the layer
* @param aParentClip Input. The parent layer's rendering clipping rectangle
* The origin is the top-left corner of the screen
* @param aRenderClip Output. The layer's rendering clipping rectangle
* The origin is the top-left corner of the screen
* @return true if the layer should be rendered.
* false if the layer can be skipped
*/
static bool CalculateClipRect(const gfx::Matrix& aTransform,
const nsIntRect* aLayerClip,
nsIntRect aParentClip, nsIntRect* aRenderClip);
/**
* Prepares hwc layer visible region required for hwc composition
*
* @param aVisible Input. Layer's unclipped visible region
* The origin is the top-left corner of the layer
* @param aLayerTransform Input. Layer's transformation matrix
* It transforms from layer space to screen space
* @param aLayerBufferTransform Input. Layer buffer's transformation matrix
* It transforms from layer buffer's space to screen space
* @param aClip Input. A clipping rectangle.
* The origin is the top-left corner of the screen
* @param aBufferRect Input. The layer's buffer bounds
* The origin is the top-left corner of the layer
* @param aVisibleRegionScreen Output. Visible region in screen space.
* The origin is the top-left corner of the screen
* @param aIsVisible Output. true if region is visible
* false if region is not visible
* @return true if region can be rendered by HWC.
* false if region should not be rendered by HWC
*/
static bool PrepareVisibleRegion(const nsIntRegion& aVisible,
const gfx::Matrix& aLayerTransform,
const gfx::Matrix& aLayerBufferTransform,
nsIntRect aClip, nsIntRect aBufferRect,
RectVector* aVisibleRegionScreen,
bool& aIsVisible);
/**
* Sets hwc layer rectangles required for hwc composition
*
* @param aVisible Input. Layer's unclipped visible rectangle
* The origin is the top-left corner of the layer
* @param aLayerTransform Input. Layer's transformation matrix
* It transforms from layer space to screen space
* @param aLayerBufferTransform Input. Layer buffer's transformation matrix
* It transforms from layer buffer's space to screen space
* @param aClip Input. A clipping rectangle.
* The origin is the top-left corner of the screen
* @param aBufferRect Input. The layer's buffer bounds
* The origin is the top-left corner of the layer
* @param aYFlipped Input. true if the buffer is rendered as Y flipped
* @param aSurceCrop Output. Area of the source to consider,
* the origin is the top-left corner of the buffer
* @param aVisibleRegionScreen Output. Visible region in screen space.
* The origin is the top-left corner of the screen
* @return true if the layer should be rendered.
* false if the layer can be skipped
*/
static bool PrepareLayerRects(nsIntRect aVisible,
const gfx::Matrix& aLayerTransform,
const gfx::Matrix& aLayerBufferTransform,
nsIntRect aClip, nsIntRect aBufferRect,
bool aYFlipped,
hwc_rect_t* aSourceCrop,
hwc_rect_t* aVisibleRegionScreen);
};
} // namespace mozilla
#endif // mozilla_HwcUtils
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