Texture.cpp revision 38e0c32852e3b9d8ca4a9d3791577f52536419cb 
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/TraceUtils.h"
20
21#include <utils/Log.h>
22
23#include <SkCanvas.h>
24
25namespace android {
26namespace uirenderer {
27
28static int bytesPerPixel(GLint glFormat) {
29    switch (glFormat) {
30    case GL_ALPHA:
31        return 1;
32    case GL_RGB:
33        return 3;
34    case GL_RGBA:
35    default:
36        return 4;
37    }
38}
39
40void Texture::setWrapST(GLenum wrapS, GLenum wrapT, bool bindTexture, bool force,
41        GLenum renderTarget) {
42
43    if (mFirstWrap || force || wrapS != mWrapS || wrapT != mWrapT) {
44        mFirstWrap = false;
45
46        mWrapS = wrapS;
47        mWrapT = wrapT;
48
49        if (bindTexture) {
50            mCaches.textureState().bindTexture(renderTarget, mId);
51        }
52
53        glTexParameteri(renderTarget, GL_TEXTURE_WRAP_S, wrapS);
54        glTexParameteri(renderTarget, GL_TEXTURE_WRAP_T, wrapT);
55    }
56}
57
58void Texture::setFilterMinMag(GLenum min, GLenum mag, bool bindTexture, bool force,
59        GLenum renderTarget) {
60
61    if (mFirstFilter || force || min != mMinFilter || mag != mMagFilter) {
62        mFirstFilter = false;
63
64        mMinFilter = min;
65        mMagFilter = mag;
66
67        if (bindTexture) {
68            mCaches.textureState().bindTexture(renderTarget, mId);
69        }
70
71        if (mipMap && min == GL_LINEAR) min = GL_LINEAR_MIPMAP_LINEAR;
72
73        glTexParameteri(renderTarget, GL_TEXTURE_MIN_FILTER, min);
74        glTexParameteri(renderTarget, GL_TEXTURE_MAG_FILTER, mag);
75    }
76}
77
78void Texture::deleteTexture() {
79    mCaches.textureState().deleteTexture(mId);
80    mId = 0;
81}
82
83bool Texture::updateSize(uint32_t width, uint32_t height, GLint format) {
84    if (mWidth == width && mHeight == height && mFormat == format) {
85        return false;
86    }
87    mWidth = width;
88    mHeight = height;
89    mFormat = format;
90    notifySizeChanged(mWidth * mHeight * bytesPerPixel(mFormat));
91    return true;
92}
93
94void Texture::upload(GLint internalformat, uint32_t width, uint32_t height,
95        GLenum format, GLenum type, const void* pixels) {
96    bool needsAlloc = updateSize(width, height, internalformat);
97    if (!needsAlloc && !pixels) {
98        return;
99    }
100    mCaches.textureState().activateTexture(0);
101    if (!mId) {
102        glGenTextures(1, &mId);
103        needsAlloc = true;
104    }
105    mCaches.textureState().bindTexture(GL_TEXTURE_2D, mId);
106    if (needsAlloc) {
107        glTexImage2D(GL_TEXTURE_2D, 0, mFormat, mWidth, mHeight, 0,
108                format, type, pixels);
109    } else {
110        glTexSubImage2D(GL_TEXTURE_2D, 0, mFormat, mWidth, mHeight, 0,
111                format, type, pixels);
112    }
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    glPixelStorei(GL_UNPACK_ALIGNMENT, bpp);
119    const bool useStride = stride != width
120            && Caches::getInstance().extensions().hasUnpackRowLength();
121    if ((stride == width) || useStride) {
122        if (useStride) {
123            glPixelStorei(GL_UNPACK_ROW_LENGTH, stride);
124        }
125
126        if (resize) {
127            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, data);
128        } else {
129            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, data);
130        }
131
132        if (useStride) {
133            glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
134        }
135    } else {
136        //  With OpenGL ES 2.0 we need to copy the bitmap in a temporary buffer
137        //  if the stride doesn't match the width
138
139        GLvoid * temp = (GLvoid *) malloc(width * height * bpp);
140        if (!temp) return;
141
142        uint8_t * pDst = (uint8_t *)temp;
143        uint8_t * pSrc = (uint8_t *)data;
144        for (GLsizei i = 0; i < height; i++) {
145            memcpy(pDst, pSrc, width * bpp);
146            pDst += width * bpp;
147            pSrc += stride * bpp;
148        }
149
150        if (resize) {
151            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, temp);
152        } else {
153            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, temp);
154        }
155
156        free(temp);
157    }
158}
159
160static void uploadSkBitmapToTexture(const SkBitmap& bitmap,
161        bool resize, GLenum format, GLenum type) {
162    uploadToTexture(resize, format, type, bitmap.rowBytesAsPixels(), bitmap.bytesPerPixel(),
163            bitmap.width(), bitmap.height(), bitmap.getPixels());
164}
165
166static void colorTypeToGlFormatAndType(SkColorType colorType,
167        GLint* outFormat, GLint* outType) {
168    switch (colorType) {
169    case kAlpha_8_SkColorType:
170        *outFormat = GL_ALPHA;
171        *outType = GL_UNSIGNED_BYTE;
172        break;
173    case kRGB_565_SkColorType:
174        *outFormat = GL_RGB;
175        *outType = GL_UNSIGNED_SHORT_5_6_5;
176        break;
177    // ARGB_4444 and Index_8 are both upconverted to RGBA_8888
178    case kARGB_4444_SkColorType:
179    case kIndex_8_SkColorType:
180    case kN32_SkColorType:
181        *outFormat = GL_RGBA;
182        *outType = GL_UNSIGNED_BYTE;
183        break;
184    default:
185        LOG_ALWAYS_FATAL("Unsupported bitmap colorType: %d", colorType);
186        break;
187    }
188}
189
190void Texture::upload(const SkBitmap& bitmap) {
191    SkAutoLockPixels alp(bitmap);
192
193    if (!bitmap.readyToDraw()) {
194        ALOGE("Cannot generate texture from bitmap");
195        return;
196    }
197
198    ATRACE_FORMAT("Upload %ux%u Texture", bitmap.width(), bitmap.height());
199
200    // We could also enable mipmapping if both bitmap dimensions are powers
201    // of 2 but we'd have to deal with size changes. Let's keep this simple
202    const bool canMipMap = mCaches.extensions().hasNPot();
203
204    // If the texture had mipmap enabled but not anymore,
205    // force a glTexImage2D to discard the mipmap levels
206    bool needsAlloc = canMipMap && mipMap && !bitmap.hasHardwareMipMap();
207
208    if (!mId) {
209        glGenTextures(1, &mId);
210        needsAlloc = true;
211    }
212
213    GLint format, type;
214    colorTypeToGlFormatAndType(bitmap.colorType(), &format, &type);
215
216    if (updateSize(bitmap.width(), bitmap.height(), format)) {
217        needsAlloc = true;
218    }
219
220    blend = !bitmap.isOpaque();
221    mCaches.textureState().bindTexture(mId);
222
223    if (CC_UNLIKELY(bitmap.colorType() == kARGB_4444_SkColorType
224            || bitmap.colorType() == kIndex_8_SkColorType)) {
225        SkBitmap rgbaBitmap;
226        rgbaBitmap.allocPixels(SkImageInfo::MakeN32(mWidth, mHeight,
227                bitmap.alphaType()));
228        rgbaBitmap.eraseColor(0);
229
230        SkCanvas canvas(rgbaBitmap);
231        canvas.drawBitmap(bitmap, 0.0f, 0.0f, nullptr);
232
233        uploadSkBitmapToTexture(rgbaBitmap, needsAlloc, format, type);
234    } else {
235        uploadSkBitmapToTexture(bitmap, needsAlloc, format, type);
236    }
237
238    if (canMipMap) {
239        mipMap = bitmap.hasHardwareMipMap();
240        if (mipMap) {
241            glGenerateMipmap(GL_TEXTURE_2D);
242        }
243    }
244
245    if (mFirstFilter) {
246        setFilter(GL_NEAREST);
247    }
248
249    if (mFirstWrap) {
250        setWrap(GL_CLAMP_TO_EDGE);
251    }
252}
253
254void Texture::wrap(GLuint id, uint32_t width, uint32_t height, GLint format) {
255    mId = id;
256    mWidth = width;
257    mHeight = height;
258    mFormat = format;
259    // We're wrapping an existing texture, so don't double count this memory
260    notifySizeChanged(0);
261}
262
263}; // namespace uirenderer
264}; // namespace android
265