/*
 * 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 android.view;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.DrawFilter;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Picture;
import android.graphics.PorterDuff;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Region;

import javax.microedition.khronos.opengles.GL;

/**
 * An implementation of Canvas on top of OpenGL ES 2.0.
 */
@SuppressWarnings({"deprecation"})
class GLES20Canvas extends Canvas {
    @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"})
    private final GL mGl;
    private final boolean mOpaque;
    private final int mRenderer;
    
    private int mWidth;
    private int mHeight;
    
    private final float[] mPoint = new float[2];
    private final float[] mLine = new float[4];

    ///////////////////////////////////////////////////////////////////////////
    // Constructors
    ///////////////////////////////////////////////////////////////////////////
    
    GLES20Canvas(GL gl, boolean translucent) {
        mGl = gl;
        mOpaque = !translucent;

        mRenderer = nCreateRenderer();
    }

    private native int nCreateRenderer();

    @Override
    protected void finalize() throws Throwable {
        try {
            super.finalize();
        } finally {
            nDestroyRenderer(mRenderer);
        }
    }

    private native void nDestroyRenderer(int renderer);

    ///////////////////////////////////////////////////////////////////////////
    // Canvas management
    ///////////////////////////////////////////////////////////////////////////
    
    @Override
    public boolean isHardwareAccelerated() {
        return true;
    }

    @Override
    public GL getGL() {
        throw new UnsupportedOperationException();
    }

    @Override
    public void setBitmap(Bitmap bitmap) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean isOpaque() {
        return mOpaque;
    }

    @Override
    public int getWidth() {
        return mWidth;
    }

    @Override
    public int getHeight() {
        return mHeight;
    }

    ///////////////////////////////////////////////////////////////////////////
    // Setup
    ///////////////////////////////////////////////////////////////////////////

    @Override
    public void setViewport(int width, int height) {
        mWidth = width;
        mHeight = height;

        nSetViewport(mRenderer, width, height);
    }
    
    private native void nSetViewport(int renderer, int width, int height);

    void onPreDraw() {
        nPrepare(mRenderer);
    }
    
    private native void nPrepare(int renderer);

    ///////////////////////////////////////////////////////////////////////////
    // Clipping
    ///////////////////////////////////////////////////////////////////////////

    @Override
    public boolean clipPath(Path path) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean clipPath(Path path, Region.Op op) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean clipRect(float left, float top, float right, float bottom) {
        return nClipRect(mRenderer, left, top, right, bottom);
    }
    
    private native boolean nClipRect(int renderer, float left, float top, float right, float bottom);

    @Override
    public boolean clipRect(float left, float top, float right, float bottom, Region.Op op) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean clipRect(int left, int top, int right, int bottom) {
        return nClipRect(mRenderer, left, top, right, bottom);        
    }
    
    private native boolean nClipRect(int renderer, int left, int top, int right, int bottom);

    @Override
    public boolean clipRect(Rect rect) {
        return clipRect(rect.left, rect.top, rect.right, rect.bottom);        
    }

    @Override
    public boolean clipRect(Rect rect, Region.Op op) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean clipRect(RectF rect) {
        return clipRect(rect.left, rect.top, rect.right, rect.bottom);
    }

    @Override
    public boolean clipRect(RectF rect, Region.Op op) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean clipRegion(Region region) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean clipRegion(Region region, Region.Op op) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean getClipBounds(Rect bounds) {
        return nGetClipBounds(mRenderer, bounds);
    }

    private native boolean nGetClipBounds(int renderer, Rect bounds);

    @Override
    public boolean quickReject(float left, float top, float right, float bottom, EdgeType type) {
        return nQuickReject(mRenderer, left, top, right, bottom, type.nativeInt);
    }
    
    private native boolean nQuickReject(int renderer, float left, float top,
            float right, float bottom, int edge);

    @Override
    public boolean quickReject(Path path, EdgeType type) {
        throw new UnsupportedOperationException();
    }

    @Override
    public boolean quickReject(RectF rect, EdgeType type) {
        return quickReject(rect.left, rect.top, rect.right, rect.bottom, type);
    }

    ///////////////////////////////////////////////////////////////////////////
    // Transformations
    ///////////////////////////////////////////////////////////////////////////

    @Override
    public void translate(float dx, float dy) {
        nTranslate(mRenderer, dx, dy);
    }
    
    private native void nTranslate(int renderer, float dx, float dy);

    @Override
    public void skew(float sx, float sy) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void rotate(float degrees) {
        nRotate(mRenderer, degrees);
    }
    
    private native void nRotate(int renderer, float degrees);

    @Override
    public void scale(float sx, float sy) {
        nScale(mRenderer, sx, sy);
    }
    
    private native void nScale(int renderer, float sx, float sy);

    @Override
    public void setMatrix(Matrix matrix) {
        nSetMatrix(mRenderer, matrix.native_instance);
    }
    
    private native void nSetMatrix(int renderer, int matrix);

    @Override
    public void getMatrix(Matrix matrix) {
        nGetMatrix(mRenderer, matrix.native_instance);
    }
    
    private native void nGetMatrix(int renderer, int matrix);

    @Override
    public void concat(Matrix matrix) {
        nConcatMatrix(mRenderer, matrix.native_instance);
    }
    
    private native void nConcatMatrix(int renderer, int matrix);
    
    ///////////////////////////////////////////////////////////////////////////
    // State management
    ///////////////////////////////////////////////////////////////////////////

    @Override
    public int save() {
        return nSave(mRenderer, 0);
    }
    
    @Override
    public int save(int saveFlags) {
        return nSave(mRenderer, saveFlags);
    }

    private native int nSave(int renderer, int flags);
    
    @Override
    public int saveLayer(RectF bounds, Paint paint, int saveFlags) {
        return saveLayer(bounds.left, bounds.top, bounds.right, bounds.bottom, paint, saveFlags);
    }

    @Override
    public int saveLayer(float left, float top, float right, float bottom, Paint paint,
            int saveFlags) {
        int nativePaint = paint == null ? 0 : paint.mNativePaint;
        return nSaveLayer(mRenderer, left, top, right, bottom, nativePaint, saveFlags);
    }

    private native int nSaveLayer(int renderer, float left, float top, float right, float bottom,
            int paint, int saveFlags);

    @Override
    public int saveLayerAlpha(RectF bounds, int alpha, int saveFlags) {
        return saveLayerAlpha(bounds.left, bounds.top, bounds.right, bounds.bottom,
                alpha, saveFlags);
    }

    @Override
    public int saveLayerAlpha(float left, float top, float right, float bottom, int alpha,
            int saveFlags) {
        return nSaveLayerAlpha(mRenderer, left, top, right, bottom, alpha, saveFlags);
    }

    private native int nSaveLayerAlpha(int renderer, float left, float top, float right,
            float bottom, int alpha, int saveFlags);
    
    @Override
    public void restore() {
        nRestore(mRenderer);
    }
    
    private native void nRestore(int renderer);

    @Override
    public void restoreToCount(int saveCount) {
        nRestoreToCount(mRenderer, saveCount);
    }

    private native void nRestoreToCount(int renderer, int saveCount);
    
    @Override
    public int getSaveCount() {
        return nGetSaveCount(mRenderer);
    }
    
    private native int nGetSaveCount(int renderer);

    ///////////////////////////////////////////////////////////////////////////
    // Filtering
    ///////////////////////////////////////////////////////////////////////////

    @Override
    public void setDrawFilter(DrawFilter filter) {
        throw new UnsupportedOperationException();
    }

    @Override
    public DrawFilter getDrawFilter() {
        throw new UnsupportedOperationException();
    }

    ///////////////////////////////////////////////////////////////////////////
    // Drawing
    ///////////////////////////////////////////////////////////////////////////

    @Override
    public void drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter,
            Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawARGB(int a, int r, int g, int b) {
        drawColor((a & 0xFF) << 24 | (r & 0xFF) << 16 | (g & 0xFF) << 8 | (b & 0xFF));
    }

    @Override
    public void drawPatch(Bitmap bitmap, byte[] chunks, RectF dst, Paint paint) {
        final int nativePaint = paint == null ? 0 : paint.mNativePaint;
        nDrawPatch(mRenderer, bitmap.mNativeBitmap, chunks, dst.left, dst.top, dst.right,
                dst.bottom, nativePaint, bitmap.getDensity(), mDensity, mScreenDensity);
    }

    private native void nDrawPatch(int renderer, int bitmap, byte[] chunks, float left, float top,
            float right, float bottom, int paint, int bitmapDensity, int canvasDensity, int screenDensity);

    @Override
    public void drawBitmap(Bitmap bitmap, float left, float top, Paint paint) {
        final int nativePaint = paint == null ? 0 : paint.mNativePaint;
        nDrawBitmap(mRenderer, bitmap.mNativeBitmap, left, top, nativePaint,
                bitmap.getDensity(), mDensity, mScreenDensity);
    }

    @Override
    public void drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint) {
        final int nativePaint = paint == null ? 0 : paint.mNativePaint;
        nDrawBitmap(mRenderer, bitmap.mNativeBitmap, matrix.native_instance, nativePaint,
                bitmap.getDensity(), mDensity, mScreenDensity);
    }

    private native void nDrawBitmap(int renderer, int bitmap, int matrix, int paint,
            int bitmapDensity, int canvasDensity, int screenDensity);

    @Override
    public void drawBitmap(Bitmap bitmap, Rect src, Rect dst, Paint paint) {
        final int nativePaint = paint == null ? 0 : paint.mNativePaint;
        nDrawBitmap(mRenderer, bitmap.mNativeBitmap, src.left, src.top, src.right, src.bottom,
                dst.left, dst.top, dst.right, dst.bottom, nativePaint,
                bitmap.getDensity(), mDensity, mScreenDensity);
    }

    @Override
    public void drawBitmap(Bitmap bitmap, Rect src, RectF dst, Paint paint) {
        final int nativePaint = paint == null ? 0 : paint.mNativePaint;
        nDrawBitmap(mRenderer, bitmap.mNativeBitmap, src.left, src.top, src.right, src.bottom,
                dst.left, dst.top, dst.right, dst.bottom, nativePaint,
                bitmap.getDensity(), mDensity, mScreenDensity);
    }

    private native void nDrawBitmap(int renderer, int bitmap, float left, float top, int paint,
            int bitmapDensity, int canvasDensity, int screenDensity);

    private native void nDrawBitmap(int renderer, int bitmap,
            float srcLeft, float srcTop, float srcRight, float srcBottom,
            float left, float top, float right, float bottom, int paint,
            int bitmapDensity, int canvasDensity, int screenDensity);

    @Override
    public void drawBitmap(int[] colors, int offset, int stride, float x, float y,
            int width, int height, boolean hasAlpha, Paint paint) {
        // TODO: Implement
    }

    @Override
    public void drawBitmap(int[] colors, int offset, int stride, int x, int y,
            int width, int height, boolean hasAlpha, Paint paint) {
        drawBitmap(colors, offset, stride, (float) x, (float) y, width, height, hasAlpha, paint);
    }

    @Override
    public void drawBitmapMesh(Bitmap bitmap, int meshWidth, int meshHeight, float[] verts,
            int vertOffset, int[] colors, int colorOffset, Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawCircle(float cx, float cy, float radius, Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawColor(int color) {
        drawColor(color, PorterDuff.Mode.SRC_OVER);
    }

    @Override
    public void drawColor(int color, PorterDuff.Mode mode) {
        nDrawColor(mRenderer, color, mode.nativeInt);
    }
    
    private native void nDrawColor(int renderer, int color, int mode);

    @Override
    public void drawLine(float startX, float startY, float stopX, float stopY, Paint paint) {
        mLine[0] = startX;
        mLine[1] = startY;
        mLine[2] = stopX;
        mLine[3] = stopY;
        drawLines(mLine, 0, 1, paint);
    }

    @Override
    public void drawLines(float[] pts, int offset, int count, Paint paint) {
        // TODO: Implement
    }

    @Override
    public void drawLines(float[] pts, Paint paint) {
        drawLines(pts, 0, pts.length / 4, paint);
    }

    @Override
    public void drawOval(RectF oval, Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawPaint(Paint paint) {
        // TODO: Implement
    }

    @Override
    public void drawPath(Path path, Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawPicture(Picture picture) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawPicture(Picture picture, Rect dst) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawPicture(Picture picture, RectF dst) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawPoint(float x, float y, Paint paint) {
        mPoint[0] = x;
        mPoint[1] = y;
        drawPoints(mPoint, 0, 1, paint);
    }

    @Override
    public void drawPoints(float[] pts, int offset, int count, Paint paint) {
        // TODO: Implement
    }

    @Override
    public void drawPoints(float[] pts, Paint paint) {
        drawPoints(pts, 0, pts.length / 2, paint);
    }

    @Override
    public void drawPosText(char[] text, int index, int count, float[] pos, Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawPosText(String text, float[] pos, Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawRect(float left, float top, float right, float bottom, Paint paint) {
        nDrawRect(mRenderer, left, top, right, bottom, paint.mNativePaint);
    }

    private native void nDrawRect(int renderer, float left, float top, float right, float bottom,
            int paint);

    @Override
    public void drawRect(Rect r, Paint paint) {
        drawRect(r.left, r.top, r.right, r.bottom, paint);
    }

    @Override
    public void drawRect(RectF r, Paint paint) {
        drawRect(r.left, r.top, r.right, r.bottom, paint);
    }

    @Override
    public void drawRGB(int r, int g, int b) {
        drawColor(0xFF000000 | (r & 0xFF) << 16 | (g & 0xFF) << 8 | (b & 0xFF));
    }

    @Override
    public void drawRoundRect(RectF rect, float rx, float ry, Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawText(char[] text, int index, int count, float x, float y, Paint paint) {
        // TODO: Implement
    }

    @Override
    public void drawText(CharSequence text, int start, int end, float x, float y, Paint paint) {
        // TODO: Implement
    }

    @Override
    public void drawText(String text, int start, int end, float x, float y, Paint paint) {
        // TODO: Implement
    }

    @Override
    public void drawText(String text, float x, float y, Paint paint) {
        drawText(text, 0, text.length(), x, y, paint);
    }

    @Override
    public void drawTextOnPath(char[] text, int index, int count, Path path, float hOffset,
            float vOffset, Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawTextOnPath(String text, Path path, float hOffset, float vOffset, Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawTextRun(char[] text, int index, int count, int contextIndex, int contextCount,
            float x, float y, int dir, Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawTextRun(CharSequence text, int start, int end, int contextStart, int contextEnd,
            float x, float y, int dir, Paint paint) {
        throw new UnsupportedOperationException();
    }

    @Override
    public void drawVertices(VertexMode mode, int vertexCount, float[] verts, int vertOffset,
            float[] texs, int texOffset, int[] colors, int colorOffset, short[] indices,
            int indexOffset, int indexCount, Paint paint) {
        throw new UnsupportedOperationException();
    }
}