/*
* 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.
*/
package com.android.gallery3d.glrenderer;
import android.graphics.Bitmap;
import android.graphics.Rect;
import android.graphics.RectF;
//
// GLCanvas gives a convenient interface to draw using OpenGL.
//
// When a rectangle is specified in this interface, it means the region
// [x, x+width) * [y, y+height)
//
public interface GLCanvas {
public GLId getGLId();
// Tells GLCanvas the size of the underlying GL surface. This should be
// called before first drawing and when the size of GL surface is changed.
// This is called by GLRoot and should not be called by the clients
// who only want to draw on the GLCanvas. Both width and height must be
// nonnegative.
public abstract void setSize(int width, int height);
// Clear the drawing buffers. This should only be used by GLRoot.
public abstract void clearBuffer();
public abstract void clearBuffer(float[] argb);
// Sets and gets the current alpha, alpha must be in [0, 1].
public abstract void setAlpha(float alpha);
public abstract float getAlpha();
// (current alpha) = (current alpha) * alpha
public abstract void multiplyAlpha(float alpha);
// Change the current transform matrix.
public abstract void translate(float x, float y, float z);
public abstract void translate(float x, float y);
public abstract void scale(float sx, float sy, float sz);
public abstract void rotate(float angle, float x, float y, float z);
public abstract void multiplyMatrix(float[] mMatrix, int offset);
// Pushes the configuration state (matrix, and alpha) onto
// a private stack.
public abstract void save();
// Same as save(), but only save those specified in saveFlags.
public abstract void save(int saveFlags);
public static final int SAVE_FLAG_ALL = 0xFFFFFFFF;
public static final int SAVE_FLAG_ALPHA = 0x01;
public static final int SAVE_FLAG_MATRIX = 0x02;
// Pops from the top of the stack as current configuration state (matrix,
// alpha, and clip). This call balances a previous call to save(), and is
// used to remove all modifications to the configuration state since the
// last save call.
public abstract void restore();
// Draws a line using the specified paint from (x1, y1) to (x2, y2).
// (Both end points are included).
public abstract void drawLine(float x1, float y1, float x2, float y2, GLPaint paint);
// Draws a rectangle using the specified paint from (x1, y1) to (x2, y2).
// (Both end points are included).
public abstract void drawRect(float x1, float y1, float x2, float y2, GLPaint paint);
// Fills the specified rectangle with the specified color.
public abstract void fillRect(float x, float y, float width, float height, int color);
// Draws a texture to the specified rectangle.
public abstract void drawTexture(
BasicTexture texture, int x, int y, int width, int height);
public abstract void drawMesh(BasicTexture tex, int x, int y, int xyBuffer,
int uvBuffer, int indexBuffer, int indexCount);
// Draws the source rectangle part of the texture to the target rectangle.
public abstract void drawTexture(BasicTexture texture, RectF source, RectF target);
// Draw a texture with a specified texture transform.
public abstract void drawTexture(BasicTexture texture, float[] mTextureTransform,
int x, int y, int w, int h);
// Draw two textures to the specified rectangle. The actual texture used is
// from * (1 - ratio) + to * ratio
// The two textures must have the same size.
public abstract void drawMixed(BasicTexture from, int toColor,
float ratio, int x, int y, int w, int h);
// Draw a region of a texture and a specified color to the specified
// rectangle. The actual color used is from * (1 - ratio) + to * ratio.
// The region of the texture is defined by parameter "src". The target
// rectangle is specified by parameter "target".
public abstract void drawMixed(BasicTexture from, int toColor,
float ratio, RectF src, RectF target);
// Unloads the specified texture from the canvas. The resource allocated
// to draw the texture will be released. The specified texture will return
// to the unloaded state. This function should be called only from
// BasicTexture or its descendant
public abstract boolean unloadTexture(BasicTexture texture);
// Delete the specified buffer object, similar to unloadTexture.
public abstract void deleteBuffer(int bufferId);
// Delete the textures and buffers in GL side. This function should only be
// called in the GL thread.
public abstract void deleteRecycledResources();
// Dump statistics information and clear the counters. For debug only.
public abstract void dumpStatisticsAndClear();
public abstract void beginRenderTarget(RawTexture texture);
public abstract void endRenderTarget();
/**
* Sets texture parameters to use GL_CLAMP_TO_EDGE for both
* GL_TEXTURE_WRAP_S and GL_TEXTURE_WRAP_T. Sets texture parameters to be
* GL_LINEAR for GL_TEXTURE_MIN_FILTER and GL_TEXTURE_MAG_FILTER.
* bindTexture() must be called prior to this.
*
* @param texture The texture to set parameters on.
*/
public abstract void setTextureParameters(BasicTexture texture);
/**
* Initializes the texture to a size by calling texImage2D on it.
*
* @param texture The texture to initialize the size.
* @param format The texture format (e.g. GL_RGBA)
* @param type The texture type (e.g. GL_UNSIGNED_BYTE)
*/
public abstract void initializeTextureSize(BasicTexture texture, int format, int type);
/**
* Initializes the texture to a size by calling texImage2D on it.
*
* @param texture The texture to initialize the size.
* @param bitmap The bitmap to initialize the bitmap with.
*/
public abstract void initializeTexture(BasicTexture texture, Bitmap bitmap);
/**
* Calls glTexSubImage2D to upload a bitmap to the texture.
*
* @param texture The target texture to write to.
* @param xOffset Specifies a texel offset in the x direction within the
* texture array.
* @param yOffset Specifies a texel offset in the y direction within the
* texture array.
* @param format The texture format (e.g. GL_RGBA)
* @param type The texture type (e.g. GL_UNSIGNED_BYTE)
*/
public abstract void texSubImage2D(BasicTexture texture, int xOffset, int yOffset,
Bitmap bitmap,
int format, int type);
/**
* Generates buffers and uploads the buffer data.
*
* @param buffer The buffer to upload
* @return The buffer ID that was generated.
*/
public abstract int uploadBuffer(java.nio.FloatBuffer buffer);
/**
* Generates buffers and uploads the element array buffer data.
*
* @param buffer The buffer to upload
* @return The buffer ID that was generated.
*/
public abstract int uploadBuffer(java.nio.ByteBuffer buffer);
/**
* After LightCycle makes GL calls, this method is called to restore the GL
* configuration to the one expected by GLCanvas.
*/
public abstract void recoverFromLightCycle();
/**
* Gets the bounds given by x, y, width, and height as well as the internal
* matrix state. There is no special handling for non-90-degree rotations.
* It only considers the lower-left and upper-right corners as the bounds.
*
* @param bounds The output bounds to write to.
* @param x The left side of the input rectangle.
* @param y The bottom of the input rectangle.
* @param width The width of the input rectangle.
* @param height The height of the input rectangle.
*/
public abstract void getBounds(Rect bounds, int x, int y, int width, int height);
}
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