void TextureCache::generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate) {
SkAutoLockPixels alp(*bitmap);
if (!bitmap->readyToDraw()) {
ALOGE("Cannot generate texture from bitmap");
return;
}
const bool resize = !regenerate || bitmap->width() != int(texture->width) ||
bitmap->height() != int(texture->height);
if (!regenerate) {
glGenTextures(1, &texture->id);
}
texture->generation = bitmap->getGenerationID();
texture->width = bitmap->width();
texture->height = bitmap->height();
glBindTexture(GL_TEXTURE_2D, texture->id);
if (!regenerate) {
glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
}
switch (bitmap->getConfig()) {
case SkBitmap::kA8_Config:
if (!regenerate) {
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
}
uploadToTexture(resize, GL_ALPHA, bitmap->rowBytesAsPixels(), texture->height,
GL_UNSIGNED_BYTE, bitmap->getPixels());
texture->blend = true;
break;
case SkBitmap::kRGB_565_Config:
uploadToTexture(resize, GL_RGB, bitmap->rowBytesAsPixels(), texture->height,
GL_UNSIGNED_SHORT_5_6_5, bitmap->getPixels());
texture->blend = false;
break;
case SkBitmap::kARGB_8888_Config:
uploadToTexture(resize, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height,
GL_UNSIGNED_BYTE, bitmap->getPixels());
// Do this after calling getPixels() to make sure Skia's deferred
// decoding happened
texture->blend = !bitmap->isOpaque();
break;
case SkBitmap::kARGB_4444_Config:
case SkBitmap::kIndex8_Config:
uploadLoFiTexture(resize, bitmap, texture->width, texture->height);
texture->blend = !bitmap->isOpaque();
break;
default:
ALOGW("Unsupported bitmap config: %d", bitmap->getConfig());
break;
}
if (!regenerate) {
texture->setFilter(GL_NEAREST);
texture->setWrap(GL_CLAMP_TO_EDGE);
}
}
void TextureCache::uploadLoFiTexture(bool resize, const SkBitmap* bitmap,
uint32_t width, uint32_t height) {
SkBitmap rgbaBitmap;
rgbaBitmap.allocPixels(SkImageInfo::MakeN32(width, height, bitmap->alphaType()));
rgbaBitmap.eraseColor(0);
SkCanvas canvas(rgbaBitmap);
canvas.drawBitmap(*bitmap, 0.0f, 0.0f, nullptr);
uploadToTexture(resize, GL_RGBA, rgbaBitmap.rowBytesAsPixels(), rgbaBitmap.bytesPerPixel(),
width, height, GL_UNSIGNED_BYTE, rgbaBitmap.getPixels());
}
void TextureCache::uploadLoFiTexture(bool resize, SkBitmap* bitmap,
uint32_t width, uint32_t height) {
SkBitmap rgbaBitmap;
rgbaBitmap.setConfig(SkBitmap::kARGB_8888_Config, width, height, 0, bitmap->alphaType());
rgbaBitmap.allocPixels();
rgbaBitmap.eraseColor(0);
SkCanvas canvas(rgbaBitmap);
canvas.drawBitmap(*bitmap, 0.0f, 0.0f, NULL);
uploadToTexture(resize, GL_RGBA, rgbaBitmap.rowBytesAsPixels(), width, height,
GL_UNSIGNED_BYTE, rgbaBitmap.getPixels());
}
void TextureCache::generateTexture(const SkBitmap* bitmap, Texture* texture, bool regenerate) {
SkAutoLockPixels alp(*bitmap);
if (!bitmap->readyToDraw()) {
ALOGE("Cannot generate texture from bitmap");
return;
}
ATRACE_FORMAT("Upload %ux%u Texture", bitmap->width(), bitmap->height());
// We could also enable mipmapping if both bitmap dimensions are powers
// of 2 but we'd have to deal with size changes. Let's keep this simple
const bool canMipMap = Caches::getInstance().extensions().hasNPot();
// If the texture had mipmap enabled but not anymore,
// force a glTexImage2D to discard the mipmap levels
const bool resize = !regenerate || bitmap->width() != int(texture->width) ||
bitmap->height() != int(texture->height) ||
(regenerate && canMipMap && texture->mipMap && !bitmap->hasHardwareMipMap());
if (!regenerate) {
glGenTextures(1, &texture->id);
}
texture->generation = bitmap->getGenerationID();
texture->width = bitmap->width();
texture->height = bitmap->height();
Caches::getInstance().textureState().bindTexture(texture->id);
switch (bitmap->colorType()) {
case kAlpha_8_SkColorType:
uploadToTexture(resize, GL_ALPHA, bitmap->rowBytesAsPixels(), bitmap->bytesPerPixel(),
texture->width, texture->height, GL_UNSIGNED_BYTE, bitmap->getPixels());
texture->blend = true;
break;
case kRGB_565_SkColorType:
uploadToTexture(resize, GL_RGB, bitmap->rowBytesAsPixels(), bitmap->bytesPerPixel(),
texture->width, texture->height, GL_UNSIGNED_SHORT_5_6_5, bitmap->getPixels());
texture->blend = false;
break;
case kN32_SkColorType:
uploadToTexture(resize, GL_RGBA, bitmap->rowBytesAsPixels(), bitmap->bytesPerPixel(),
texture->width, texture->height, GL_UNSIGNED_BYTE, bitmap->getPixels());
// Do this after calling getPixels() to make sure Skia's deferred
// decoding happened
texture->blend = !bitmap->isOpaque();
break;
case kARGB_4444_SkColorType:
case kIndex_8_SkColorType:
uploadLoFiTexture(resize, bitmap, texture->width, texture->height);
texture->blend = !bitmap->isOpaque();
break;
default:
ALOGW("Unsupported bitmap colorType: %d", bitmap->colorType());
break;
}
if (canMipMap) {
texture->mipMap = bitmap->hasHardwareMipMap();
if (texture->mipMap) {
glGenerateMipmap(GL_TEXTURE_2D);
}
}
if (!regenerate) {
texture->setFilter(GL_NEAREST);
texture->setWrap(GL_CLAMP_TO_EDGE);
}
}
