Texture.cpp revision 2a38c42e921451abebb4ee5f5ecd738f1b6b04ed 
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
29// Number of bytes used by a texture in the given format
30static int bytesPerPixel(GLint glFormat) {
31    switch (glFormat) {
32    // The wrapped-texture case, usually means a SurfaceTexture
33    case 0:
34        return 0;
35    case GL_LUMINANCE:
36    case GL_ALPHA:
37        return 1;
38    case GL_SRGB8:
39    case GL_RGB:
40        return 3;
41    case GL_SRGB8_ALPHA8:
42    case GL_RGBA:
43        return 4;
44    case GL_RGBA16F:
45        return 8;
46    default:
47        LOG_ALWAYS_FATAL("UNKNOWN FORMAT %d", glFormat);
48    }
49}
50
51void Texture::setWrapST(GLenum wrapS, GLenum wrapT, bool bindTexture, bool force) {
52
53    if (force || wrapS != mWrapS || wrapT != mWrapT) {
54        mWrapS = wrapS;
55        mWrapT = wrapT;
56
57        if (bindTexture) {
58            mCaches.textureState().bindTexture(mTarget, mId);
59        }
60
61        glTexParameteri(mTarget, GL_TEXTURE_WRAP_S, wrapS);
62        glTexParameteri(mTarget, GL_TEXTURE_WRAP_T, wrapT);
63    }
64}
65
66void Texture::setFilterMinMag(GLenum min, GLenum mag, bool bindTexture, bool force) {
67    if (force || min != mMinFilter || mag != mMagFilter) {
68        mMinFilter = min;
69        mMagFilter = mag;
70
71        if (bindTexture) {
72            mCaches.textureState().bindTexture(mTarget, mId);
73        }
74
75        if (mipMap && min == GL_LINEAR) min = GL_LINEAR_MIPMAP_LINEAR;
76
77        glTexParameteri(mTarget, GL_TEXTURE_MIN_FILTER, min);
78        glTexParameteri(mTarget, GL_TEXTURE_MAG_FILTER, mag);
79    }
80}
81
82void Texture::deleteTexture() {
83    mCaches.textureState().deleteTexture(mId);
84    mId = 0;
85}
86
87bool Texture::updateSize(uint32_t width, uint32_t height, GLint internalFormat,
88        GLint format, GLenum target) {
89    if (mWidth == width
90            && mHeight == height
91            && mFormat == format
92            && mInternalFormat == internalFormat
93            && mTarget == target) {
94        return false;
95    }
96    mWidth = width;
97    mHeight = height;
98    mFormat = format;
99    mInternalFormat = internalFormat;
100    mTarget = target;
101    notifySizeChanged(mWidth * mHeight * bytesPerPixel(internalFormat));
102    return true;
103}
104
105void Texture::resetCachedParams() {
106    mWrapS = GL_REPEAT;
107    mWrapT = GL_REPEAT;
108    mMinFilter = GL_NEAREST_MIPMAP_LINEAR;
109    mMagFilter = GL_LINEAR;
110}
111
112void Texture::upload(GLint internalFormat, uint32_t width, uint32_t height,
113        GLenum format, GLenum type, const void* pixels) {
114    GL_CHECKPOINT(MODERATE);
115    bool needsAlloc = updateSize(width, height, internalFormat, format, GL_TEXTURE_2D);
116    if (!mId) {
117        glGenTextures(1, &mId);
118        needsAlloc = true;
119        resetCachedParams();
120    }
121    mCaches.textureState().bindTexture(GL_TEXTURE_2D, mId);
122    if (needsAlloc) {
123        glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, mWidth, mHeight, 0,
124                format, type, pixels);
125    } else if (pixels) {
126        glTexSubImage2D(GL_TEXTURE_2D, 0, internalFormat, mWidth, mHeight, 0,
127                format, type, pixels);
128    }
129    GL_CHECKPOINT(MODERATE);
130}
131
132static void uploadToTexture(bool resize, GLint internalFormat, GLenum format, GLenum type,
133        GLsizei stride, GLsizei bpp, GLsizei width, GLsizei height, const GLvoid * data) {
134
135    const bool useStride = stride != width
136            && Caches::getInstance().extensions().hasUnpackRowLength();
137    if ((stride == width) || useStride) {
138        if (useStride) {
139            glPixelStorei(GL_UNPACK_ROW_LENGTH, stride);
140        }
141
142        if (resize) {
143            glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, width, height, 0, format, type, data);
144        } else {
145            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, data);
146        }
147
148        if (useStride) {
149            glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
150        }
151    } else {
152        //  With OpenGL ES 2.0 we need to copy the bitmap in a temporary buffer
153        //  if the stride doesn't match the width
154
155        GLvoid * temp = (GLvoid *) malloc(width * height * bpp);
156        if (!temp) return;
157
158        uint8_t * pDst = (uint8_t *)temp;
159        uint8_t * pSrc = (uint8_t *)data;
160        for (GLsizei i = 0; i < height; i++) {
161            memcpy(pDst, pSrc, width * bpp);
162            pDst += width * bpp;
163            pSrc += stride * bpp;
164        }
165
166        if (resize) {
167            glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, width, height, 0, format, type, temp);
168        } else {
169            glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, height, format, type, temp);
170        }
171
172        free(temp);
173    }
174}
175
176static void colorTypeToGlFormatAndType(const Caches& caches, SkColorType colorType,
177        bool needSRGB, GLint* outInternalFormat, GLint* outFormat, GLint* outType) {
178    switch (colorType) {
179    case kAlpha_8_SkColorType:
180        *outFormat = GL_ALPHA;
181        *outInternalFormat = GL_ALPHA;
182        *outType = GL_UNSIGNED_BYTE;
183        break;
184    case kRGB_565_SkColorType:
185        if (needSRGB) {
186            // We would ideally use a GL_RGB/GL_SRGB8 texture but the
187            // intermediate Skia bitmap needs to be ARGB_8888
188            *outFormat = GL_RGBA;
189            *outInternalFormat = caches.rgbaInternalFormat();
190            *outType = GL_UNSIGNED_BYTE;
191        } else {
192            *outFormat = GL_RGB;
193            *outInternalFormat = GL_RGB;
194            *outType = GL_UNSIGNED_SHORT_5_6_5;
195        }
196        break;
197    // ARGB_4444 and Index_8 are both upconverted to RGBA_8888
198    case kARGB_4444_SkColorType:
199    case kIndex_8_SkColorType:
200    case kN32_SkColorType:
201        *outFormat = GL_RGBA;
202        *outInternalFormat = caches.rgbaInternalFormat(needSRGB);
203        *outType = GL_UNSIGNED_BYTE;
204        break;
205    case kGray_8_SkColorType:
206        // TODO: Handle sRGB
207        *outFormat = GL_LUMINANCE;
208        *outInternalFormat = GL_LUMINANCE;
209        *outType = GL_UNSIGNED_BYTE;
210        break;
211    default:
212        LOG_ALWAYS_FATAL("Unsupported bitmap colorType: %d", colorType);
213        break;
214    }
215}
216
217void Texture::upload(Bitmap& bitmap) {
218    if (!bitmap.readyToDraw()) {
219        ALOGE("Cannot generate texture from bitmap");
220        return;
221    }
222
223    ATRACE_FORMAT("Upload %ux%u Texture", bitmap.width(), bitmap.height());
224
225    // We could also enable mipmapping if both bitmap dimensions are powers
226    // of 2 but we'd have to deal with size changes. Let's keep this simple
227    const bool canMipMap = mCaches.extensions().hasNPot();
228
229    // If the texture had mipmap enabled but not anymore,
230    // force a glTexImage2D to discard the mipmap levels
231    bool needsAlloc = canMipMap && mipMap && !bitmap.hasHardwareMipMap();
232    bool setDefaultParams = false;
233
234    if (!mId) {
235        glGenTextures(1, &mId);
236        needsAlloc = true;
237        setDefaultParams = true;
238    }
239
240    sk_sp<SkColorSpace> sRGB = SkColorSpace::NewNamed(SkColorSpace::kSRGB_Named);
241    bool needSRGB = bitmap.info().colorSpace() == sRGB.get();
242
243    GLint internalFormat, format, type;
244    colorTypeToGlFormatAndType(mCaches, bitmap.colorType(), needSRGB, &internalFormat, &format, &type);
245
246    if (updateSize(bitmap.width(), bitmap.height(), internalFormat, format, GL_TEXTURE_2D)) {
247        needsAlloc = true;
248    }
249
250    blend = !bitmap.isOpaque();
251    mCaches.textureState().bindTexture(mId);
252
253    // TODO: Handle sRGB gray bitmaps
254    bool hasSRGB = mCaches.extensions().hasSRGB();
255    if (CC_UNLIKELY(bitmap.colorType() == kARGB_4444_SkColorType
256            || bitmap.colorType() == kIndex_8_SkColorType
257            || (bitmap.colorType() == kRGB_565_SkColorType && hasSRGB && needSRGB))) {
258
259        SkBitmap rgbaBitmap;
260        rgbaBitmap.allocPixels(SkImageInfo::MakeN32(
261                mWidth, mHeight, bitmap.info().alphaType(), hasSRGB ? sRGB : nullptr));
262        rgbaBitmap.eraseColor(0);
263
264        SkCanvas canvas(rgbaBitmap);
265        SkBitmap skBitmap;
266        bitmap.getSkBitmap(&skBitmap);
267        canvas.drawBitmap(skBitmap, 0.0f, 0.0f, nullptr);
268
269        uploadToTexture(needsAlloc, internalFormat, format, type, rgbaBitmap.rowBytesAsPixels(),
270                rgbaBitmap.bytesPerPixel(), rgbaBitmap.width(),
271                rgbaBitmap.height(), rgbaBitmap.getPixels());
272
273    } else {
274        uploadToTexture(needsAlloc, internalFormat, format, type, bitmap.rowBytesAsPixels(),
275                bitmap.info().bytesPerPixel(), bitmap.width(), bitmap.height(), bitmap.pixels());
276    }
277
278    if (canMipMap) {
279        mipMap = bitmap.hasHardwareMipMap();
280        if (mipMap) {
281            glGenerateMipmap(GL_TEXTURE_2D);
282        }
283    }
284
285    if (setDefaultParams) {
286        setFilter(GL_NEAREST);
287        setWrap(GL_CLAMP_TO_EDGE);
288    }
289}
290
291void Texture::wrap(GLuint id, uint32_t width, uint32_t height,
292        GLint internalFormat, GLint format, GLenum target) {
293    mId = id;
294    mWidth = width;
295    mHeight = height;
296    mFormat = format;
297    mInternalFormat = internalFormat;
298    mTarget = target;
299    // We're wrapping an existing texture, so don't double count this memory
300    notifySizeChanged(0);
301}
302
303}; // namespace uirenderer
304}; // namespace android
305