Texture.cpp revision a83c1e545e017a272eedf4d2c78ecd779aa84645 
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    mCaches.textureState().activateTexture(0);
99    bool needsAlloc = updateSize(width, height, internalformat);
100    if (!mId) {
101        glGenTextures(1, &mId);
102        needsAlloc = true;
103    }
104    mCaches.textureState().bindTexture(GL_TEXTURE_2D, mId);
105    if (needsAlloc) {
106        glTexImage2D(GL_TEXTURE_2D, 0, mFormat, mWidth, mHeight, 0,
107                format, type, pixels);
108    } else if (pixels) {
109        glTexSubImage2D(GL_TEXTURE_2D, 0, mFormat, mWidth, mHeight, 0,
110                format, type, pixels);
111    }
112    GL_CHECKPOINT();
113}
114
115static void uploadToTexture(bool resize, GLenum format, GLenum type, GLsizei stride, GLsizei bpp,
116        GLsizei width, GLsizei height, const GLvoid * data) {
117
118    const bool useStride = stride != width
119            && Caches::getInstance().extensions().hasUnpackRowLength();
120    if ((stride == width) || useStride) {
121        if (useStride) {
122            glPixelStorei(GL_UNPACK_ROW_LENGTH, stride);
123        }
124
125        if (resize) {
126            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, data);
127        } else {
128            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, data);
129        }
130
131        if (useStride) {
132            glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
133        }
134    } else {
135        //  With OpenGL ES 2.0 we need to copy the bitmap in a temporary buffer
136        //  if the stride doesn't match the width
137
138        GLvoid * temp = (GLvoid *) malloc(width * height * bpp);
139        if (!temp) return;
140
141        uint8_t * pDst = (uint8_t *)temp;
142        uint8_t * pSrc = (uint8_t *)data;
143        for (GLsizei i = 0; i < height; i++) {
144            memcpy(pDst, pSrc, width * bpp);
145            pDst += width * bpp;
146            pSrc += stride * bpp;
147        }
148
149        if (resize) {
150            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, temp);
151        } else {
152            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, temp);
153        }
154
155        free(temp);
156    }
157}
158
159static void uploadSkBitmapToTexture(const SkBitmap& bitmap,
160        bool resize, GLenum format, GLenum type) {
161    uploadToTexture(resize, format, type, bitmap.rowBytesAsPixels(), bitmap.bytesPerPixel(),
162            bitmap.width(), bitmap.height(), bitmap.getPixels());
163}
164
165static void colorTypeToGlFormatAndType(SkColorType colorType,
166        GLint* outFormat, GLint* outType) {
167    switch (colorType) {
168    case kAlpha_8_SkColorType:
169        *outFormat = GL_ALPHA;
170        *outType = GL_UNSIGNED_BYTE;
171        break;
172    case kRGB_565_SkColorType:
173        *outFormat = GL_RGB;
174        *outType = GL_UNSIGNED_SHORT_5_6_5;
175        break;
176    // ARGB_4444 and Index_8 are both upconverted to RGBA_8888
177    case kARGB_4444_SkColorType:
178    case kIndex_8_SkColorType:
179    case kN32_SkColorType:
180        *outFormat = GL_RGBA;
181        *outType = GL_UNSIGNED_BYTE;
182        break;
183    case kGray_8_SkColorType:
184        *outFormat = GL_LUMINANCE;
185        *outType = GL_UNSIGNED_BYTE;
186        break;
187    default:
188        LOG_ALWAYS_FATAL("Unsupported bitmap colorType: %d", colorType);
189        break;
190    }
191}
192
193void Texture::upload(const SkBitmap& bitmap) {
194    SkAutoLockPixels alp(bitmap);
195
196    if (!bitmap.readyToDraw()) {
197        ALOGE("Cannot generate texture from bitmap");
198        return;
199    }
200
201    ATRACE_FORMAT("Upload %ux%u Texture", bitmap.width(), bitmap.height());
202
203    // We could also enable mipmapping if both bitmap dimensions are powers
204    // of 2 but we'd have to deal with size changes. Let's keep this simple
205    const bool canMipMap = mCaches.extensions().hasNPot();
206
207    // If the texture had mipmap enabled but not anymore,
208    // force a glTexImage2D to discard the mipmap levels
209    bool needsAlloc = canMipMap && mipMap && !bitmap.hasHardwareMipMap();
210
211    if (!mId) {
212        glGenTextures(1, &mId);
213        needsAlloc = true;
214    }
215
216    GLint format, type;
217    colorTypeToGlFormatAndType(bitmap.colorType(), &format, &type);
218
219    if (updateSize(bitmap.width(), bitmap.height(), format)) {
220        needsAlloc = true;
221    }
222
223    blend = !bitmap.isOpaque();
224    mCaches.textureState().bindTexture(mId);
225
226    if (CC_UNLIKELY(bitmap.colorType() == kARGB_4444_SkColorType
227            || bitmap.colorType() == kIndex_8_SkColorType)) {
228        SkBitmap rgbaBitmap;
229        rgbaBitmap.allocPixels(SkImageInfo::MakeN32(mWidth, mHeight,
230                bitmap.alphaType()));
231        rgbaBitmap.eraseColor(0);
232
233        SkCanvas canvas(rgbaBitmap);
234        canvas.drawBitmap(bitmap, 0.0f, 0.0f, nullptr);
235
236        uploadSkBitmapToTexture(rgbaBitmap, needsAlloc, format, type);
237    } else {
238        uploadSkBitmapToTexture(bitmap, needsAlloc, format, type);
239    }
240
241    if (canMipMap) {
242        mipMap = bitmap.hasHardwareMipMap();
243        if (mipMap) {
244            glGenerateMipmap(GL_TEXTURE_2D);
245        }
246    }
247
248    if (mFirstFilter) {
249        setFilter(GL_NEAREST);
250    }
251
252    if (mFirstWrap) {
253        setWrap(GL_CLAMP_TO_EDGE);
254    }
255}
256
257void Texture::wrap(GLuint id, uint32_t width, uint32_t height, GLint format) {
258    mId = id;
259    mWidth = width;
260    mHeight = height;
261    mFormat = format;
262    // We're wrapping an existing texture, so don't double count this memory
263    notifySizeChanged(0);
264}
265
266}; // namespace uirenderer
267}; // namespace android
268