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comparison: mobile/android/base/gfx/TileLayer.java

mobile/android/base/gfx/TileLayer.java

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1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
2 * This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5
6 package org.mozilla.gecko.gfx;
7
8 import android.graphics.Rect;
9 import android.opengl.GLES20;
10 import android.util.Log;
11
12 import java.nio.ByteBuffer;
13
14 /**
15 * Base class for tile layers, which encapsulate the logic needed to draw textured tiles in OpenGL
16 * ES.
17 */
18 public abstract class TileLayer extends Layer {
19 private static final String LOGTAG = "GeckoTileLayer";
20
21 private final Rect mDirtyRect;
22 private IntSize mSize;
23 private int[] mTextureIDs;
24
25 protected final CairoImage mImage;
26
27 public enum PaintMode { NORMAL, REPEAT, STRETCH };
28 private PaintMode mPaintMode;
29
30 public TileLayer(CairoImage image, PaintMode paintMode) {
31 super(image.getSize());
32
33 mPaintMode = paintMode;
34 mImage = image;
35 mSize = new IntSize(0, 0);
36 mDirtyRect = new Rect();
37 }
38
39 protected boolean repeats() { return mPaintMode == PaintMode.REPEAT; }
40 protected boolean stretches() { return mPaintMode == PaintMode.STRETCH; }
41 protected int getTextureID() { return mTextureIDs[0]; }
42 protected boolean initialized() { return mImage != null && mTextureIDs != null; }
43
44 @Override
45 protected void finalize() throws Throwable {
46 try {
47 if (mTextureIDs != null)
48 TextureReaper.get().add(mTextureIDs);
49 } finally {
50 super.finalize();
51 }
52 }
53
54 public void destroy() {
55 try {
56 if (mImage != null) {
57 mImage.destroy();
58 }
59 } catch (Exception ex) {
60 Log.e(LOGTAG, "error clearing buffers: ", ex);
61 }
62 }
63
64 public void setPaintMode(PaintMode mode) {
65 mPaintMode = mode;
66 }
67
68 /**
69 * Invalidates the entire buffer so that it will be uploaded again. Only valid inside a
70 * transaction.
71 */
72
73 public void invalidate() {
74 if (!inTransaction())
75 throw new RuntimeException("invalidate() is only valid inside a transaction");
76 IntSize bufferSize = mImage.getSize();
77 mDirtyRect.set(0, 0, bufferSize.width, bufferSize.height);
78 }
79
80 private void validateTexture() {
81 /* Calculate the ideal texture size. This must be a power of two if
82 * the texture is repeated or OpenGL ES 2.0 isn't supported, as
83 * OpenGL ES 2.0 is required for NPOT texture support (without
84 * extensions), but doesn't support repeating NPOT textures.
85 *
86 * XXX Currently, we don't pick a GLES 2.0 context, so always round.
87 */
88 IntSize textureSize = mImage.getSize().nextPowerOfTwo();
89
90 if (!textureSize.equals(mSize)) {
91 mSize = textureSize;
92
93 // Delete the old texture
94 if (mTextureIDs != null) {
95 TextureReaper.get().add(mTextureIDs);
96 mTextureIDs = null;
97
98 // Free the texture immediately, so we don't incur a
99 // temporarily increased memory usage.
100 TextureReaper.get().reap();
101 }
102 }
103 }
104
105 @Override
106 protected void performUpdates(RenderContext context) {
107 super.performUpdates(context);
108
109 // Reallocate the texture if the size has changed
110 validateTexture();
111
112 // Don't do any work if the image has an invalid size.
113 if (!mImage.getSize().isPositive())
114 return;
115
116 // If we haven't allocated a texture, assume the whole region is dirty
117 if (mTextureIDs == null) {
118 uploadFullTexture();
119 } else {
120 uploadDirtyRect(mDirtyRect);
121 }
122
123 mDirtyRect.setEmpty();
124 }
125
126 private void uploadFullTexture() {
127 IntSize bufferSize = mImage.getSize();
128 uploadDirtyRect(new Rect(0, 0, bufferSize.width, bufferSize.height));
129 }
130
131 private void uploadDirtyRect(Rect dirtyRect) {
132 // If we have nothing to upload, just return for now
133 if (dirtyRect.isEmpty())
134 return;
135
136 // It's possible that the buffer will be null, check for that and return
137 ByteBuffer imageBuffer = mImage.getBuffer();
138 if (imageBuffer == null)
139 return;
140
141 if (mTextureIDs == null) {
142 mTextureIDs = new int[1];
143 GLES20.glGenTextures(mTextureIDs.length, mTextureIDs, 0);
144 }
145
146 int cairoFormat = mImage.getFormat();
147 CairoGLInfo glInfo = new CairoGLInfo(cairoFormat);
148
149 bindAndSetGLParameters();
150
151 // XXX TexSubImage2D is too broken to rely on on Adreno, and very slow
152 // on other chipsets, so we always upload the entire buffer.
153 IntSize bufferSize = mImage.getSize();
154 if (mSize.equals(bufferSize)) {
155 GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, glInfo.internalFormat, mSize.width,
156 mSize.height, 0, glInfo.format, glInfo.type, imageBuffer);
157 } else {
158 // Our texture has been expanded to the next power of two.
159 // XXX We probably never want to take this path, so throw an exception.
160 throw new RuntimeException("Buffer/image size mismatch in TileLayer!");
161 }
162 }
163
164 private void bindAndSetGLParameters() {
165 GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
166 GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureIDs[0]);
167 GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER,
168 GLES20.GL_LINEAR);
169 GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER,
170 GLES20.GL_LINEAR);
171
172 int repeatMode = repeats() ? GLES20.GL_REPEAT : GLES20.GL_CLAMP_TO_EDGE;
173 GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, repeatMode);
174 GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, repeatMode);
175 }
176 }
177

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