Texture.cpp revision 2de7771740ee08fcaff638ec6b2e460bb72fff04 
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    const bool useStride = stride != width
126            && Caches::getInstance().extensions().hasUnpackRowLength();
127    if ((stride == width) || useStride) {
128        if (useStride) {
129            glPixelStorei(GL_UNPACK_ROW_LENGTH, stride);
130        }
131
132        if (resize) {
133            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, data);
134        } else {
135            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, data);
136        }
137
138        if (useStride) {
139            glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
140        }
141    } else {
142        //  With OpenGL ES 2.0 we need to copy the bitmap in a temporary buffer
143        //  if the stride doesn't match the width
144
145        GLvoid * temp = (GLvoid *) malloc(width * height * bpp);
146        if (!temp) return;
147
148        uint8_t * pDst = (uint8_t *)temp;
149        uint8_t * pSrc = (uint8_t *)data;
150        for (GLsizei i = 0; i < height; i++) {
151            memcpy(pDst, pSrc, width * bpp);
152            pDst += width * bpp;
153            pSrc += stride * bpp;
154        }
155
156        if (resize) {
157            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, temp);
158        } else {
159            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, temp);
160        }
161
162        free(temp);
163    }
164}
165
166static void uploadSkBitmapToTexture(const SkBitmap& bitmap,
167        bool resize, GLenum format, GLenum type) {
168    uploadToTexture(resize, format, type, bitmap.rowBytesAsPixels(), bitmap.bytesPerPixel(),
169            bitmap.width(), bitmap.height(), bitmap.getPixels());
170}
171
172static void colorTypeToGlFormatAndType(SkColorType colorType,
173        GLint* outFormat, GLint* outType) {
174    switch (colorType) {
175    case kAlpha_8_SkColorType:
176        *outFormat = GL_ALPHA;
177        *outType = GL_UNSIGNED_BYTE;
178        break;
179    case kRGB_565_SkColorType:
180        *outFormat = GL_RGB;
181        *outType = GL_UNSIGNED_SHORT_5_6_5;
182        break;
183    // ARGB_4444 and Index_8 are both upconverted to RGBA_8888
184    case kARGB_4444_SkColorType:
185    case kIndex_8_SkColorType:
186    case kN32_SkColorType:
187        *outFormat = GL_RGBA;
188        *outType = GL_UNSIGNED_BYTE;
189        break;
190    default:
191        LOG_ALWAYS_FATAL("Unsupported bitmap colorType: %d", colorType);
192        break;
193    }
194}
195
196void Texture::upload(const SkBitmap& bitmap) {
197    SkAutoLockPixels alp(bitmap);
198
199    if (!bitmap.readyToDraw()) {
200        ALOGE("Cannot generate texture from bitmap");
201        return;
202    }
203
204    ATRACE_FORMAT("Upload %ux%u Texture", bitmap.width(), bitmap.height());
205
206    // We could also enable mipmapping if both bitmap dimensions are powers
207    // of 2 but we'd have to deal with size changes. Let's keep this simple
208    const bool canMipMap = mCaches.extensions().hasNPot();
209
210    // If the texture had mipmap enabled but not anymore,
211    // force a glTexImage2D to discard the mipmap levels
212    bool needsAlloc = canMipMap && mipMap && !bitmap.hasHardwareMipMap();
213
214    if (!mId) {
215        glGenTextures(1, &mId);
216        needsAlloc = true;
217    }
218
219    GLint format, type;
220    colorTypeToGlFormatAndType(bitmap.colorType(), &format, &type);
221
222    if (updateSize(bitmap.width(), bitmap.height(), format)) {
223        needsAlloc = true;
224    }
225
226    blend = !bitmap.isOpaque();
227    mCaches.textureState().bindTexture(mId);
228
229    if (CC_UNLIKELY(bitmap.colorType() == kARGB_4444_SkColorType
230            || bitmap.colorType() == kIndex_8_SkColorType)) {
231        SkBitmap rgbaBitmap;
232        rgbaBitmap.allocPixels(SkImageInfo::MakeN32(mWidth, mHeight,
233                bitmap.alphaType()));
234        rgbaBitmap.eraseColor(0);
235
236        SkCanvas canvas(rgbaBitmap);
237        canvas.drawBitmap(bitmap, 0.0f, 0.0f, nullptr);
238
239        uploadSkBitmapToTexture(rgbaBitmap, needsAlloc, format, type);
240    } else {
241        uploadSkBitmapToTexture(bitmap, needsAlloc, format, type);
242    }
243
244    if (canMipMap) {
245        mipMap = bitmap.hasHardwareMipMap();
246        if (mipMap) {
247            glGenerateMipmap(GL_TEXTURE_2D);
248        }
249    }
250
251    if (mFirstFilter) {
252        setFilter(GL_NEAREST);
253    }
254
255    if (mFirstWrap) {
256        setWrap(GL_CLAMP_TO_EDGE);
257    }
258}
259
260void Texture::wrap(GLuint id, uint32_t width, uint32_t height, GLint format) {
261    mId = id;
262    mWidth = width;
263    mHeight = height;
264    mFormat = format;
265    // We're wrapping an existing texture, so don't double count this memory
266    notifySizeChanged(0);
267}
268
269}; // namespace uirenderer
270}; // namespace android
271