Texture.cpp revision 88d842fedf9a6c03dee1f2c91bc7a1f51c8438da 
1/*
2 * Copyright (C) 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "Caches.h"
18#include "Texture.h"
19#include "utils/GLUtils.h"
20#include "utils/TraceUtils.h"
21
22#include <utils/Log.h>
23
24#include <SkCanvas.h>
25
26namespace android {
27namespace uirenderer {
28
29static int bytesPerPixel(GLint glFormat) {
30    switch (glFormat) {
31    case GL_ALPHA:
32        return 1;
33    case GL_RGB:
34        return 3;
35    case GL_RGBA:
36    default:
37        return 4;
38    }
39}
40
41void Texture::setWrapST(GLenum wrapS, GLenum wrapT, bool bindTexture, bool force,
42        GLenum renderTarget) {
43
44    if (mFirstWrap || force || wrapS != mWrapS || wrapT != mWrapT) {
45        mFirstWrap = false;
46
47        mWrapS = wrapS;
48        mWrapT = wrapT;
49
50        if (bindTexture) {
51            mCaches.textureState().bindTexture(renderTarget, mId);
52        }
53
54        glTexParameteri(renderTarget, GL_TEXTURE_WRAP_S, wrapS);
55        glTexParameteri(renderTarget, GL_TEXTURE_WRAP_T, wrapT);
56    }
57}
58
59void Texture::setFilterMinMag(GLenum min, GLenum mag, bool bindTexture, bool force,
60        GLenum renderTarget) {
61
62    if (mFirstFilter || force || min != mMinFilter || mag != mMagFilter) {
63        mFirstFilter = false;
64
65        mMinFilter = min;
66        mMagFilter = mag;
67
68        if (bindTexture) {
69            mCaches.textureState().bindTexture(renderTarget, mId);
70        }
71
72        if (mipMap && min == GL_LINEAR) min = GL_LINEAR_MIPMAP_LINEAR;
73
74        glTexParameteri(renderTarget, GL_TEXTURE_MIN_FILTER, min);
75        glTexParameteri(renderTarget, GL_TEXTURE_MAG_FILTER, mag);
76    }
77}
78
79void Texture::deleteTexture() {
80    mCaches.textureState().deleteTexture(mId);
81    mId = 0;
82}
83
84bool Texture::updateSize(uint32_t width, uint32_t height, GLint format) {
85    if (mWidth == width && mHeight == height && mFormat == format) {
86        return false;
87    }
88    mWidth = width;
89    mHeight = height;
90    mFormat = format;
91    notifySizeChanged(mWidth * mHeight * bytesPerPixel(mFormat));
92    return true;
93}
94
95void Texture::upload(GLint internalformat, uint32_t width, uint32_t height,
96        GLenum format, GLenum type, const void* pixels) {
97    GL_CHECKPOINT();
98    bool needsAlloc = updateSize(width, height, internalformat);
99    if (!needsAlloc && !pixels) {
100        return;
101    }
102    mCaches.textureState().activateTexture(0);
103    GL_CHECKPOINT();
104    if (!mId) {
105        glGenTextures(1, &mId);
106        needsAlloc = true;
107    }
108    GL_CHECKPOINT();
109    mCaches.textureState().bindTexture(GL_TEXTURE_2D, mId);
110    GL_CHECKPOINT();
111    if (needsAlloc) {
112        glTexImage2D(GL_TEXTURE_2D, 0, mFormat, mWidth, mHeight, 0,
113                format, type, pixels);
114        GL_CHECKPOINT();
115    } else {
116        glTexSubImage2D(GL_TEXTURE_2D, 0, mFormat, mWidth, mHeight, 0,
117                format, type, pixels);
118        GL_CHECKPOINT();
119    }
120}
121
122static void uploadToTexture(bool resize, GLenum format, GLenum type, GLsizei stride, GLsizei bpp,
123        GLsizei width, GLsizei height, const GLvoid * data) {
124
125    glPixelStorei(GL_UNPACK_ALIGNMENT, bpp);
126    const bool useStride = stride != width
127            && Caches::getInstance().extensions().hasUnpackRowLength();
128    if ((stride == width) || useStride) {
129        if (useStride) {
130            glPixelStorei(GL_UNPACK_ROW_LENGTH, stride);
131        }
132
133        if (resize) {
134            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, data);
135        } else {
136            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, data);
137        }
138
139        if (useStride) {
140            glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
141        }
142    } else {
143        //  With OpenGL ES 2.0 we need to copy the bitmap in a temporary buffer
144        //  if the stride doesn't match the width
145
146        GLvoid * temp = (GLvoid *) malloc(width * height * bpp);
147        if (!temp) return;
148
149        uint8_t * pDst = (uint8_t *)temp;
150        uint8_t * pSrc = (uint8_t *)data;
151        for (GLsizei i = 0; i < height; i++) {
152            memcpy(pDst, pSrc, width * bpp);
153            pDst += width * bpp;
154            pSrc += stride * bpp;
155        }
156
157        if (resize) {
158            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, temp);
159        } else {
160            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, temp);
161        }
162
163        free(temp);
164    }
165}
166
167static void uploadSkBitmapToTexture(const SkBitmap& bitmap,
168        bool resize, GLenum format, GLenum type) {
169    uploadToTexture(resize, format, type, bitmap.rowBytesAsPixels(), bitmap.bytesPerPixel(),
170            bitmap.width(), bitmap.height(), bitmap.getPixels());
171}
172
173static void colorTypeToGlFormatAndType(SkColorType colorType,
174        GLint* outFormat, GLint* outType) {
175    switch (colorType) {
176    case kAlpha_8_SkColorType:
177        *outFormat = GL_ALPHA;
178        *outType = GL_UNSIGNED_BYTE;
179        break;
180    case kRGB_565_SkColorType:
181        *outFormat = GL_RGB;
182        *outType = GL_UNSIGNED_SHORT_5_6_5;
183        break;
184    // ARGB_4444 and Index_8 are both upconverted to RGBA_8888
185    case kARGB_4444_SkColorType:
186    case kIndex_8_SkColorType:
187    case kN32_SkColorType:
188        *outFormat = GL_RGBA;
189        *outType = GL_UNSIGNED_BYTE;
190        break;
191    case kGray_8_SkColorType:
192        *outFormat = GL_LUMINANCE;
193        *outType = GL_UNSIGNED_BYTE;
194        break;
195    default:
196        LOG_ALWAYS_FATAL("Unsupported bitmap colorType: %d", colorType);
197        break;
198    }
199}
200
201void Texture::upload(const SkBitmap& bitmap) {
202    SkAutoLockPixels alp(bitmap);
203
204    if (!bitmap.readyToDraw()) {
205        ALOGE("Cannot generate texture from bitmap");
206        return;
207    }
208
209    ATRACE_FORMAT("Upload %ux%u Texture", bitmap.width(), bitmap.height());
210
211    // We could also enable mipmapping if both bitmap dimensions are powers
212    // of 2 but we'd have to deal with size changes. Let's keep this simple
213    const bool canMipMap = mCaches.extensions().hasNPot();
214
215    // If the texture had mipmap enabled but not anymore,
216    // force a glTexImage2D to discard the mipmap levels
217    bool needsAlloc = canMipMap && mipMap && !bitmap.hasHardwareMipMap();
218
219    if (!mId) {
220        glGenTextures(1, &mId);
221        needsAlloc = true;
222    }
223
224    GLint format, type;
225    colorTypeToGlFormatAndType(bitmap.colorType(), &format, &type);
226
227    if (updateSize(bitmap.width(), bitmap.height(), format)) {
228        needsAlloc = true;
229    }
230
231    blend = !bitmap.isOpaque();
232    mCaches.textureState().bindTexture(mId);
233
234    if (CC_UNLIKELY(bitmap.colorType() == kARGB_4444_SkColorType
235            || bitmap.colorType() == kIndex_8_SkColorType)) {
236        SkBitmap rgbaBitmap;
237        rgbaBitmap.allocPixels(SkImageInfo::MakeN32(mWidth, mHeight,
238                bitmap.alphaType()));
239        rgbaBitmap.eraseColor(0);
240
241        SkCanvas canvas(rgbaBitmap);
242        canvas.drawBitmap(bitmap, 0.0f, 0.0f, nullptr);
243
244        uploadSkBitmapToTexture(rgbaBitmap, needsAlloc, format, type);
245    } else {
246        uploadSkBitmapToTexture(bitmap, needsAlloc, format, type);
247    }
248
249    if (canMipMap) {
250        mipMap = bitmap.hasHardwareMipMap();
251        if (mipMap) {
252            glGenerateMipmap(GL_TEXTURE_2D);
253        }
254    }
255
256    if (mFirstFilter) {
257        setFilter(GL_NEAREST);
258    }
259
260    if (mFirstWrap) {
261        setWrap(GL_CLAMP_TO_EDGE);
262    }
263}
264
265void Texture::wrap(GLuint id, uint32_t width, uint32_t height, GLint format) {
266    mId = id;
267    mWidth = width;
268    mHeight = height;
269    mFormat = format;
270    // We're wrapping an existing texture, so don't double count this memory
271    notifySizeChanged(0);
272}
273
274}; // namespace uirenderer
275}; // namespace android
276