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Diffstat (limited to 'libs/hwui/OpenGLRenderer.h')
| -rw-r--r-- | libs/hwui/OpenGLRenderer.h | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h new file mode 100644 index 0000000..76783e9 --- /dev/null +++ b/libs/hwui/OpenGLRenderer.h @@ -0,0 +1,319 @@ +/* + * 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_UI_OPENGL_RENDERER_H +#define ANDROID_UI_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/RefBase.h> +#include <utils/ResourceTypes.h> + +#include "Extensions.h" +#include "Matrix.h" +#include "Program.h" +#include "Rect.h" +#include "Snapshot.h" +#include "TextureCache.h" +#include "LayerCache.h" +#include "GradientCache.h" +#include "PatchCache.h" +#include "Vertex.h" +#include "FontRenderer.h" +#include "ProgramCache.h" +#include "SkiaShader.h" +#include "SkiaColorFilter.h" +#include "PathCache.h" + +namespace android { +namespace uirenderer { + +/////////////////////////////////////////////////////////////////////////////// +// Renderer +/////////////////////////////////////////////////////////////////////////////// + +/** + * OpenGL renderer used to draw accelerated 2D graphics. The API is a + * simplified version of Skia's Canvas API. + */ +class OpenGLRenderer { +public: + OpenGLRenderer(); + ~OpenGLRenderer(); + + void setViewport(int width, int height); + void prepare(); + + int getSaveCount() const; + int save(int flags); + void restore(); + void restoreToCount(int saveCount); + + int saveLayer(float left, float top, float right, float bottom, const SkPaint* p, int flags); + int saveLayerAlpha(float left, float top, float right, float bottom, int alpha, int flags); + + void translate(float dx, float dy); + void rotate(float degrees); + void scale(float sx, float sy); + + void setMatrix(SkMatrix* matrix); + void getMatrix(SkMatrix* matrix); + void concatMatrix(SkMatrix* matrix); + + const Rect& getClipBounds(); + bool quickReject(float left, float top, float right, float bottom); + bool clipRect(float left, float top, float right, float bottom, SkRegion::Op op); + + void drawBitmap(SkBitmap* bitmap, float left, float top, const SkPaint* paint); + void drawBitmap(SkBitmap* bitmap, const SkMatrix* matrix, const SkPaint* paint); + void drawBitmap(SkBitmap* bitmap, float srcLeft, float srcTop, float srcRight, float srcBottom, + float dstLeft, float dstTop, float dstRight, float dstBottom, const SkPaint* paint); + void drawPatch(SkBitmap* bitmap, Res_png_9patch* patch, float left, float top, + float right, float bottom, const SkPaint* paint); + void drawColor(int color, SkXfermode::Mode mode); + void drawRect(float left, float top, float right, float bottom, const SkPaint* paint); + void drawPath(SkPath* path, SkPaint* paint); + + void resetShader(); + void setupShader(SkiaShader* shader); + + void resetColorFilter(); + void setupColorFilter(SkiaColorFilter* filter); + + void drawText(const char* text, int bytesCount, int count, float x, float y, SkPaint* paint); + +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. + * + * @return The new save count. This value can be passed to #restoreToCount() + */ + int saveSnapshot(); + + /** + * Restores the current snapshot; mSnapshot becomes mSnapshot->previous. + * + * @return True if the clip should be also reapplied by calling + * #setScissorFromClip(). + */ + bool restoreSnapshot(); + + /** + * Sets the clipping rectangle using glScissor. The clip is defined by + * the current snapshot's clipRect member. + */ + void setScissorFromClip(); + + /** + * 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 + */ + void composeLayer(sp<Snapshot> current, sp<Snapshot> previous); + + /** + * 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 + * + * @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); + + /** + * 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 + */ + void drawColorRect(float left, float top, float right, float bottom, + int color, SkXfermode::Mode mode, bool ignoreTransform = false); + + /** + * 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, + const Texture* texture, const SkPaint* paint); + + /** + * Draws a textured mesh with the specified texture. If the indices are omitted, the + * mesh is drawn as a simple quad. + * + * @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 indices The indices of the vertices, can be NULL + * @param elementsCount The number of elements in the mesh, required by indices + */ + void drawTextureMesh(float left, float top, float right, float bottom, GLuint texture, + float alpha, SkXfermode::Mode mode, bool blend, + GLvoid* vertices, GLvoid* texCoords, GLvoid* indices, GLsizei elementsCount = 0); + + /** + * 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(const SkPaint* paint, int* alpha, SkXfermode::Mode* mode); + + /** + * Binds the specified texture with the specified wrap modes. + */ + inline void bindTexture(GLuint texture, GLenum wrapS, GLenum wrapT, GLuint textureUnit = 0); + + /** + * 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, bool isPremultiplied = true); + + /** + * 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); + + // 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 + Program* mCurrentProgram; + SkiaShader* mShader; + + // Color filters + SkiaColorFilter* mColorFilter; + + // Used to draw textured quads + TextureVertex mMeshVertices[4]; + + // Last known blend state + bool mBlend; + GLenum mLastSrcMode; + GLenum mLastDstMode; + + // GL extensions + Extensions mExtensions; + + // Font renderer + FontRenderer mFontRenderer; + + // Various caches + TextureCache mTextureCache; + LayerCache mLayerCache; + GradientCache mGradientCache; + ProgramCache mProgramCache; + PathCache mPathCache; + PatchCache mPatchCache; +}; // class OpenGLRenderer + +}; // namespace uirenderer +}; // namespace android + +#endif // ANDROID_UI_OPENGL_RENDERER_H |