Texture.cpp revision 975591a7af883d866d86ab819e164c6004694744 
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 (force || wrapS != mWrapS || wrapT != mWrapT) {
45        mWrapS = wrapS;
46        mWrapT = wrapT;
47
48        if (bindTexture) {
49            mCaches.textureState().bindTexture(renderTarget, mId);
50        }
51
52        glTexParameteri(renderTarget, GL_TEXTURE_WRAP_S, wrapS);
53        glTexParameteri(renderTarget, GL_TEXTURE_WRAP_T, wrapT);
54    }
55}
56
57void Texture::setFilterMinMag(GLenum min, GLenum mag, bool bindTexture, bool force,
58        GLenum renderTarget) {
59
60    if (force || min != mMinFilter || mag != mMagFilter) {
61        mMinFilter = min;
62        mMagFilter = mag;
63
64        if (bindTexture) {
65            mCaches.textureState().bindTexture(renderTarget, mId);
66        }
67
68        if (mipMap && min == GL_LINEAR) min = GL_LINEAR_MIPMAP_LINEAR;
69
70        glTexParameteri(renderTarget, GL_TEXTURE_MIN_FILTER, min);
71        glTexParameteri(renderTarget, GL_TEXTURE_MAG_FILTER, mag);
72    }
73}
74
75void Texture::deleteTexture() {
76    mCaches.textureState().deleteTexture(mId);
77    mId = 0;
78}
79
80bool Texture::updateSize(uint32_t width, uint32_t height, GLint format) {
81    if (mWidth == width && mHeight == height && mFormat == format) {
82        return false;
83    }
84    mWidth = width;
85    mHeight = height;
86    mFormat = format;
87    notifySizeChanged(mWidth * mHeight * bytesPerPixel(mFormat));
88    return true;
89}
90
91void Texture::resetCachedParams() {
92    mWrapS = GL_REPEAT;
93    mWrapT = GL_REPEAT;
94    mMinFilter = GL_NEAREST_MIPMAP_LINEAR;
95    mMagFilter = GL_LINEAR;
96}
97
98void Texture::upload(GLint internalformat, uint32_t width, uint32_t height,
99        GLenum format, GLenum type, const void* pixels) {
100    GL_CHECKPOINT(MODERATE);
101    bool needsAlloc = updateSize(width, height, internalformat);
102    if (!mId) {
103        glGenTextures(1, &mId);
104        needsAlloc = true;
105        resetCachedParams();
106    }
107    mCaches.textureState().bindTexture(GL_TEXTURE_2D, mId);
108    if (needsAlloc) {
109        glTexImage2D(GL_TEXTURE_2D, 0, mFormat, mWidth, mHeight, 0,
110                format, type, pixels);
111    } else if (pixels) {
112        glTexSubImage2D(GL_TEXTURE_2D, 0, mFormat, mWidth, mHeight, 0,
113                format, type, pixels);
114    }
115    GL_CHECKPOINT(MODERATE);
116}
117
118static void uploadToTexture(bool resize, GLenum format, GLenum type, GLsizei stride, GLsizei bpp,
119        GLsizei width, GLsizei height, const GLvoid * data) {
120
121    const bool useStride = stride != width
122            && Caches::getInstance().extensions().hasUnpackRowLength();
123    if ((stride == width) || useStride) {
124        if (useStride) {
125            glPixelStorei(GL_UNPACK_ROW_LENGTH, stride);
126        }
127
128        if (resize) {
129            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, data);
130        } else {
131            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, data);
132        }
133
134        if (useStride) {
135            glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
136        }
137    } else {
138        //  With OpenGL ES 2.0 we need to copy the bitmap in a temporary buffer
139        //  if the stride doesn't match the width
140
141        GLvoid * temp = (GLvoid *) malloc(width * height * bpp);
142        if (!temp) return;
143
144        uint8_t * pDst = (uint8_t *)temp;
145        uint8_t * pSrc = (uint8_t *)data;
146        for (GLsizei i = 0; i < height; i++) {
147            memcpy(pDst, pSrc, width * bpp);
148            pDst += width * bpp;
149            pSrc += stride * bpp;
150        }
151
152        if (resize) {
153            glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, type, temp);
154        } else {
155            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, temp);
156        }
157
158        free(temp);
159    }
160}
161
162static void uploadSkBitmapToTexture(const SkBitmap& bitmap,
163        bool resize, GLenum format, GLenum type) {
164    uploadToTexture(resize, format, type, bitmap.rowBytesAsPixels(), bitmap.bytesPerPixel(),
165            bitmap.width(), bitmap.height(), bitmap.getPixels());
166}
167
168static void colorTypeToGlFormatAndType(SkColorType colorType,
169        GLint* outFormat, GLint* outType) {
170    switch (colorType) {
171    case kAlpha_8_SkColorType:
172        *outFormat = GL_ALPHA;
173        *outType = GL_UNSIGNED_BYTE;
174        break;
175    case kRGB_565_SkColorType:
176        *outFormat = GL_RGB;
177        *outType = GL_UNSIGNED_SHORT_5_6_5;
178        break;
179    // ARGB_4444 and Index_8 are both upconverted to RGBA_8888
180    case kARGB_4444_SkColorType:
181    case kIndex_8_SkColorType:
182    case kN32_SkColorType:
183        *outFormat = GL_RGBA;
184        *outType = GL_UNSIGNED_BYTE;
185        break;
186    case kGray_8_SkColorType:
187        *outFormat = GL_LUMINANCE;
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    bool setDefaultParams = false;
214
215    if (!mId) {
216        glGenTextures(1, &mId);
217        needsAlloc = true;
218        setDefaultParams = true;
219    }
220
221    GLint format, type;
222    colorTypeToGlFormatAndType(bitmap.colorType(), &format, &type);
223
224    if (updateSize(bitmap.width(), bitmap.height(), format)) {
225        needsAlloc = true;
226    }
227
228    blend = !bitmap.isOpaque();
229    mCaches.textureState().bindTexture(mId);
230
231    if (CC_UNLIKELY(bitmap.colorType() == kARGB_4444_SkColorType
232            || bitmap.colorType() == kIndex_8_SkColorType)) {
233        SkBitmap rgbaBitmap;
234        rgbaBitmap.allocPixels(SkImageInfo::MakeN32(mWidth, mHeight,
235                bitmap.alphaType()));
236        rgbaBitmap.eraseColor(0);
237
238        SkCanvas canvas(rgbaBitmap);
239        canvas.drawBitmap(bitmap, 0.0f, 0.0f, nullptr);
240
241        uploadSkBitmapToTexture(rgbaBitmap, needsAlloc, format, type);
242    } else {
243        uploadSkBitmapToTexture(bitmap, needsAlloc, format, type);
244    }
245
246    if (canMipMap) {
247        mipMap = bitmap.hasHardwareMipMap();
248        if (mipMap) {
249            glGenerateMipmap(GL_TEXTURE_2D);
250        }
251    }
252
253    if (setDefaultParams) {
254        setFilter(GL_NEAREST);
255        setWrap(GL_CLAMP_TO_EDGE);
256    }
257}
258
259void Texture::wrap(GLuint id, uint32_t width, uint32_t height, GLint format) {
260    mId = id;
261    mWidth = width;
262    mHeight = height;
263    mFormat = format;
264    // We're wrapping an existing texture, so don't double count this memory
265    notifySizeChanged(0);
266}
267
268}; // namespace uirenderer
269}; // namespace android
270