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/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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 ANDROID_HWUI_OPENGL_RENDERER_H
#define ANDROID_HWUI_OPENGL_RENDERER_H
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <SkBitmap.h>
#include <SkMatrix.h>
#include <SkPaint.h>
#include <SkRegion.h>
#include <SkShader.h>
#include <SkXfermode.h>
#include <utils/Functor.h>
#include <utils/RefBase.h>
#include <utils/Vector.h>
#include "Debug.h"
#include "Extensions.h"
#include "Matrix.h"
#include "Program.h"
#include "Rect.h"
#include "Snapshot.h"
#include "Vertex.h"
#include "SkiaShader.h"
#include "SkiaColorFilter.h"
#include "Caches.h"
namespace android {
namespace uirenderer {
///////////////////////////////////////////////////////////////////////////////
// Renderer
///////////////////////////////////////////////////////////////////////////////
class DisplayList;
/**
* OpenGL renderer used to draw accelerated 2D graphics. The API is a
* simplified version of Skia's Canvas API.
*/
class OpenGLRenderer {
public:
OpenGLRenderer();
virtual ~OpenGLRenderer();
virtual void setViewport(int width, int height);
void prepare(bool opaque);
virtual void prepareDirty(float left, float top, float right, float bottom, bool opaque);
virtual void finish();
// These two calls must not be recorded in display lists
virtual void interrupt();
virtual void resume();
virtual bool callDrawGLFunction(Functor *functor, Rect& dirty);
int getSaveCount() const;
virtual int save(int flags);
virtual void restore();
virtual void restoreToCount(int saveCount);
virtual int saveLayer(float left, float top, float right, float bottom,
SkPaint* p, int flags);
virtual int saveLayerAlpha(float left, float top, float right, float bottom,
int alpha, int flags);
virtual void translate(float dx, float dy);
virtual void rotate(float degrees);
virtual void scale(float sx, float sy);
virtual void skew(float sx, float sy);
const float* getMatrix() const;
void getMatrix(SkMatrix* matrix);
virtual void setMatrix(SkMatrix* matrix);
virtual void concatMatrix(SkMatrix* matrix);
const Rect& getClipBounds();
bool quickReject(float left, float top, float right, float bottom);
virtual bool clipRect(float left, float top, float right, float bottom, SkRegion::Op op);
virtual bool drawDisplayList(DisplayList* displayList, uint32_t width, uint32_t height,
Rect& dirty, uint32_t level = 0);
virtual void outputDisplayList(DisplayList* displayList, uint32_t level = 0);
virtual void drawLayer(Layer* layer, float x, float y, SkPaint* paint);
virtual void drawBitmap(SkBitmap* bitmap, float left, float top, SkPaint* paint);
virtual void drawBitmap(SkBitmap* bitmap, SkMatrix* matrix, SkPaint* paint);
virtual void drawBitmap(SkBitmap* bitmap, float srcLeft, float srcTop,
float srcRight, float srcBottom, float dstLeft, float dstTop,
float dstRight, float dstBottom, SkPaint* paint);
virtual void drawBitmapMesh(SkBitmap* bitmap, int meshWidth, int meshHeight,
float* vertices, int* colors, SkPaint* paint);
virtual void drawPatch(SkBitmap* bitmap, const int32_t* xDivs, const int32_t* yDivs,
const uint32_t* colors, uint32_t width, uint32_t height, int8_t numColors,
float left, float top, float right, float bottom, SkPaint* paint);
virtual void drawColor(int color, SkXfermode::Mode mode);
virtual void drawRect(float left, float top, float right, float bottom, SkPaint* paint);
virtual void drawRoundRect(float left, float top, float right, float bottom,
float rx, float ry, SkPaint* paint);
virtual void drawCircle(float x, float y, float radius, SkPaint* paint);
virtual void drawOval(float left, float top, float right, float bottom, SkPaint* paint);
virtual void drawArc(float left, float top, float right, float bottom,
float startAngle, float sweepAngle, bool useCenter, SkPaint* paint);
virtual void drawPath(SkPath* path, SkPaint* paint);
virtual void drawLines(float* points, int count, SkPaint* paint);
virtual void drawPoints(float* points, int count, SkPaint* paint);
virtual void drawText(const char* text, int bytesCount, int count, float x, float y,
SkPaint* paint);
virtual void resetShader();
virtual void setupShader(SkiaShader* shader);
virtual void resetColorFilter();
virtual void setupColorFilter(SkiaColorFilter* filter);
virtual void resetShadow();
virtual void setupShadow(float radius, float dx, float dy, int color);
protected:
/**
* Compose the layer defined in the current snapshot with the layer
* defined by the previous snapshot.
*
* The current snapshot *must* be a layer (flag kFlagIsLayer set.)
*
* @param curent The current snapshot containing the layer to compose
* @param previous The previous snapshot to compose the current layer with
*/
virtual void composeLayer(sp<Snapshot> current, sp<Snapshot> previous);
/**
* Marks the specified region as dirty at the specified bounds.
*/
void dirtyLayerUnchecked(Rect& bounds, Region* region);
/**
* Returns the current snapshot.
*/
sp<Snapshot> getSnapshot() {
return mSnapshot;
}
/**
* Returns the region of the current layer.
*/
virtual Region* getRegion() {
return mSnapshot->region;
}
/**
* Indicates whether rendering is currently targeted at a layer.
*/
virtual bool hasLayer() {
return (mSnapshot->flags & Snapshot::kFlagFboTarget) && mSnapshot->region;
}
/**
* Returns the name of the FBO this renderer is rendering into.
*/
virtual GLint getTargetFbo() {
return 0;
}
/**
* Renders the specified layer as a textured quad.
*
* @param layer The layer to render
* @param rect The bounds of the layer
*/
void drawTextureLayer(Layer* layer, const Rect& rect);
private:
/**
* Saves the current state of the renderer as a new snapshot.
* The new snapshot is saved in mSnapshot and the previous snapshot
* is linked from mSnapshot->previous.
*
* @param flags The save flags; see SkCanvas for more information
*
* @return The new save count. This value can be passed to #restoreToCount()
*/
int saveSnapshot(int flags);
/**
* Restores the current snapshot; mSnapshot becomes mSnapshot->previous.
*
* @return True if the clip was modified.
*/
bool restoreSnapshot();
/**
* Sets the clipping rectangle using glScissor. The clip is defined by
* the current snapshot's clipRect member.
*/
void setScissorFromClip();
/**
* Creates a new layer stored in the specified snapshot.
*
* @param snapshot The snapshot associated with the new layer
* @param left The left coordinate of the layer
* @param top The top coordinate of the layer
* @param right The right coordinate of the layer
* @param bottom The bottom coordinate of the layer
* @param alpha The translucency of the layer
* @param mode The blending mode of the layer
* @param flags The layer save flags
* @param previousFbo The name of the current framebuffer
*
* @return True if the layer was successfully created, false otherwise
*/
bool createLayer(sp<Snapshot> snapshot, float left, float top, float right, float bottom,
int alpha, SkXfermode::Mode mode, int flags, GLuint previousFbo);
/**
* Creates a new layer stored in the specified snapshot as an FBO.
*
* @param layer The layer to store as an FBO
* @param snapshot The snapshot associated with the new layer
* @param bounds The bounds of the layer
* @param previousFbo The name of the current framebuffer
*/
bool createFboLayer(Layer* layer, Rect& bounds, sp<Snapshot> snapshot,
GLuint previousFbo);
/**
* Compose the specified layer as a region.
*
* @param layer The layer to compose
* @param rect The layer's bounds
*/
void composeLayerRegion(Layer* layer, const Rect& rect);
/**
* Compose the specified layer as a simple rectangle.
*
* @param layer The layer to compose
* @param rect The layer's bounds
* @param swap If true, the source and destination are swapped
*/
void composeLayerRect(Layer* layer, const Rect& rect, bool swap = false);
/**
* Clears all the regions corresponding to the current list of layers.
* This method MUST be invoked before any drawing operation.
*/
void clearLayerRegions();
/**
* Mark the layer as dirty at the specified coordinates. The coordinates
* are transformed with the supplied matrix.
*/
void dirtyLayer(const float left, const float top,
const float right, const float bottom, const mat4 transform);
/**
* Mark the layer as dirty at the specified coordinates.
*/
void dirtyLayer(const float left, const float top,
const float right, const float bottom);
/**
* Draws a colored rectangle with the specified color. The specified coordinates
* are transformed by the current snapshot's transform matrix.
*
* @param left The left coordinate of the rectangle
* @param top The top coordinate of the rectangle
* @param right The right coordinate of the rectangle
* @param bottom The bottom coordinate of the rectangle
* @param color The rectangle's ARGB color, defined as a packed 32 bits word
* @param mode The Skia xfermode to use
* @param ignoreTransform True if the current transform should be ignored
* @param ignoreBlending True if the blending is set by the caller
*/
void drawColorRect(float left, float top, float right, float bottom,
int color, SkXfermode::Mode mode, bool ignoreTransform = false);
/**
* Draws the shape represented by the specified path texture.
* This method invokes drawPathTexture() but takes into account
* the extra left/top offset and the texture offset to correctly
* position the final shape.
*
* @param left The left coordinate of the shape to render
* @param top The top coordinate of the shape to render
* @param texture The texture reprsenting the shape
* @param paint The paint to draw the shape with
*/
void drawShape(float left, float top, const PathTexture* texture, SkPaint* paint);
/**
* Renders the rect defined by the specified bounds as a shape.
* This will render the rect using a path texture, which is used to render
* rects with stroke effects.
*
* @param left The left coordinate of the rect to draw
* @param top The top coordinate of the rect to draw
* @param right The right coordinate of the rect to draw
* @param bottom The bottom coordinate of the rect to draw
* @param p The paint to draw the rect with
*/
void drawRectAsShape(float left, float top, float right, float bottom, SkPaint* p);
/**
* Draws the specified texture as an alpha bitmap. Alpha bitmaps obey
* different compositing rules.
*
* @param texture The texture to draw with
* @param left The x coordinate of the bitmap
* @param top The y coordinate of the bitmap
* @param paint The paint to render with
*/
void drawAlphaBitmap(Texture* texture, float left, float top, SkPaint* paint);
/**
* Renders the rect defined by the specified bounds as an anti-aliased rect.
*
* @param left The left coordinate of the rect to draw
* @param top The top coordinate of the rect to draw
* @param right The right coordinate of the rect to draw
* @param bottom The bottom coordinate of the rect to draw
* @param color The color of the rect
* @param mode The blending mode to draw the rect
*/
void drawAARect(float left, float top, float right, float bottom,
int color, SkXfermode::Mode mode);
/**
* Draws a textured rectangle with the specified texture. The specified coordinates
* are transformed by the current snapshot's transform matrix.
*
* @param left The left coordinate of the rectangle
* @param top The top coordinate of the rectangle
* @param right The right coordinate of the rectangle
* @param bottom The bottom coordinate of the rectangle
* @param texture The texture name to map onto the rectangle
* @param alpha An additional translucency parameter, between 0.0f and 1.0f
* @param mode The blending mode
* @param blend True if the texture contains an alpha channel
*/
void drawTextureRect(float left, float top, float right, float bottom, GLuint texture,
float alpha, SkXfermode::Mode mode, bool blend);
/**
* Draws a textured rectangle with the specified texture. The specified coordinates
* are transformed by the current snapshot's transform matrix.
*
* @param left The left coordinate of the rectangle
* @param top The top coordinate of the rectangle
* @param right The right coordinate of the rectangle
* @param bottom The bottom coordinate of the rectangle
* @param texture The texture to use
* @param paint The paint containing the alpha, blending mode, etc.
*/
void drawTextureRect(float left, float top, float right, float bottom,
Texture* texture, SkPaint* paint);
/**
* Draws a textured mesh with the specified texture. If the indices are omitted,
* the mesh is drawn as a simple quad. The mesh pointers become offsets when a
* VBO is bound.
*
* @param left The left coordinate of the rectangle
* @param top The top coordinate of the rectangle
* @param right The right coordinate of the rectangle
* @param bottom The bottom coordinate of the rectangle
* @param texture The texture name to map onto the rectangle
* @param alpha An additional translucency parameter, between 0.0f and 1.0f
* @param mode The blending mode
* @param blend True if the texture contains an alpha channel
* @param vertices The vertices that define the mesh
* @param texCoords The texture coordinates of each vertex
* @param elementsCount The number of elements in the mesh, required by indices
* @param swapSrcDst Whether or not the src and dst blending operations should be swapped
* @param ignoreTransform True if the current transform should be ignored
* @param vbo The VBO used to draw the mesh
* @param ignoreScale True if the model view matrix should not be scaled
* @param dirty True if calling this method should dirty the current layer
*/
void drawTextureMesh(float left, float top, float right, float bottom, GLuint texture,
float alpha, SkXfermode::Mode mode, bool blend,
GLvoid* vertices, GLvoid* texCoords, GLenum drawMode, GLsizei elementsCount,
bool swapSrcDst = false, bool ignoreTransform = false, GLuint vbo = 0,
bool ignoreScale = false, bool dirty = true);
/**
* Draws text underline and strike-through if needed.
*
* @param text The text to decor
* @param bytesCount The number of bytes in the text
* @param length The length in pixels of the text, can be <= 0.0f to force a measurement
* @param x The x coordinate where the text will be drawn
* @param y The y coordinate where the text will be drawn
* @param paint The paint to draw the text with
*/
void drawTextDecorations(const char* text, int bytesCount, float length,
float x, float y, SkPaint* paint);
/**
* Draws a path texture. Path textures are alpha8 bitmaps that need special
* compositing to apply colors/filters/etc.
*
* @param texture The texture to render
* @param x The x coordinate where the texture will be drawn
* @param y The y coordinate where the texture will be drawn
* @param paint The paint to draw the texture with
*/
void drawPathTexture(const PathTexture* texture, float x, float y, SkPaint* paint);
/**
* Resets the texture coordinates stored in mMeshVertices. Setting the values
* back to default is achieved by calling:
*
* resetDrawTextureTexCoords(0.0f, 0.0f, 1.0f, 1.0f);
*
* @param u1 The left coordinate of the texture
* @param v1 The bottom coordinate of the texture
* @param u2 The right coordinate of the texture
* @param v2 The top coordinate of the texture
*/
void resetDrawTextureTexCoords(float u1, float v1, float u2, float v2);
/**
* Gets the alpha and xfermode out of a paint object. If the paint is null
* alpha will be 255 and the xfermode will be SRC_OVER.
*
* @param paint The paint to extract values from
* @param alpha Where to store the resulting alpha
* @param mode Where to store the resulting xfermode
*/
inline void getAlphaAndMode(SkPaint* paint, int* alpha, SkXfermode::Mode* mode);
/**
* Binds the specified texture. The texture unit must have been selected
* prior to calling this method.
*/
inline void bindTexture(GLuint texture) {
glBindTexture(GL_TEXTURE_2D, texture);
}
/**
* Binds the specified EGLImage texture. The texture unit must have been selected
* prior to calling this method.
*/
inline void bindExternalTexture(GLuint texture) {
glBindTexture(GL_TEXTURE_EXTERNAL_OES, texture);
}
/**
* Sets the wrap modes for the specified texture. The wrap modes are modified
* only when needed.
*/
inline void setTextureWrapModes(Texture* texture, GLenum wrapS, GLenum wrapT);
/**
* Enable or disable blending as necessary. This function sets the appropriate
* blend function based on the specified xfermode.
*/
inline void chooseBlending(bool blend, SkXfermode::Mode mode, ProgramDescription& description,
bool swapSrcDst = false);
/**
* Safely retrieves the mode from the specified xfermode. If the specified
* xfermode is null, the mode is assumed to be SkXfermode::kSrcOver_Mode.
*/
inline SkXfermode::Mode getXfermode(SkXfermode* mode);
/**
* Use the specified program with the current GL context. If the program is already
* in use, it will not be bound again. If it is not in use, the current program is
* marked unused and the specified program becomes used and becomes the new
* current program.
*
* @param program The program to use
*
* @return true If the specified program was already in use, false otherwise.
*/
inline bool useProgram(Program* program);
/**
* Invoked before any drawing operation. This sets required state.
*/
void setupDraw(bool clear = true);
/**
* Various methods to setup OpenGL rendering.
*/
void setupDrawWithTexture(bool isAlpha8 = false);
void setupDrawWithExternalTexture();
void setupDrawAALine();
void setupDrawPoint(float pointSize);
void setupDrawColor(int color);
void setupDrawColor(int color, int alpha);
void setupDrawColor(float r, float g, float b, float a);
void setupDrawAlpha8Color(int color, int alpha);
void setupDrawAlpha8Color(float r, float g, float b, float a);
void setupDrawShader();
void setupDrawColorFilter();
void setupDrawBlending(SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode,
bool swapSrcDst = false);
void setupDrawBlending(bool blend = true, SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode,
bool swapSrcDst = false);
void setupDrawProgram();
void setupDrawDirtyRegionsDisabled();
void setupDrawModelViewIdentity(bool offset = false);
void setupDrawModelView(float left, float top, float right, float bottom,
bool ignoreTransform = false, bool ignoreModelView = false);
void setupDrawModelViewTranslate(float left, float top, float right, float bottom,
bool ignoreTransform = false);
void setupDrawPointUniforms();
void setupDrawColorUniforms();
void setupDrawPureColorUniforms();
void setupDrawShaderIdentityUniforms();
void setupDrawShaderUniforms(bool ignoreTransform = false);
void setupDrawColorFilterUniforms();
void setupDrawSimpleMesh();
void setupDrawTexture(GLuint texture);
void setupDrawExternalTexture(GLuint texture);
void setupDrawTextureTransform();
void setupDrawTextureTransformUniforms(mat4& transform);
void setupDrawMesh(GLvoid* vertices, GLvoid* texCoords = NULL, GLuint vbo = 0);
void setupDrawVertices(GLvoid* vertices);
void setupDrawAALine(GLvoid* vertices, GLvoid* distanceCoords, GLvoid* lengthCoords,
float strokeWidth);
void finishDrawTexture();
void accountForClear(SkXfermode::Mode mode);
void drawRegionRects(const Region& region);
/**
* Should be invoked every time the glScissor is modified.
*/
inline void dirtyClip() {
mDirtyClip = true;
}
// Dimensions of the drawing surface
int mWidth, mHeight;
// Matrix used for ortho projection in shaders
mat4 mOrthoMatrix;
// Model-view matrix used to position/size objects
mat4 mModelView;
// Number of saved states
int mSaveCount;
// Base state
sp<Snapshot> mFirstSnapshot;
// Current state
sp<Snapshot> mSnapshot;
// Shaders
SkiaShader* mShader;
// Color filters
SkiaColorFilter* mColorFilter;
// Used to draw textured quads
TextureVertex mMeshVertices[4];
// Drop shadow
bool mHasShadow;
float mShadowRadius;
float mShadowDx;
float mShadowDy;
int mShadowColor;
// Various caches
Caches& mCaches;
// List of rectagnles to clear after saveLayer() is invoked
Vector<Rect*> mLayers;
// Indentity matrix
const mat4 mIdentity;
// Indicates whether the clip must be restored
bool mDirtyClip;
// The following fields are used to setup drawing
// Used to describe the shaders to generate
ProgramDescription mDescription;
// Color description
bool mColorSet;
float mColorA, mColorR, mColorG, mColorB;
// Indicates that the shader should get a color
bool mSetShaderColor;
// Current texture unit
GLuint mTextureUnit;
// Track dirty regions, true by default
bool mTrackDirtyRegions;
// Texture coordinates slot
int mTexCoordsSlot;
friend class DisplayListRenderer;
}; // class OpenGLRenderer
}; // namespace uirenderer
}; // namespace android
#endif // ANDROID_HWUI_OPENGL_RENDERER_H