1 files changed, 168 insertions, 0 deletions
diff --git a/libs/hwui/TextureCache.cpp b/libs/hwui/TextureCache.cpp
new file mode 100644
index 0000000..3f9698d
--- /dev/null
+++ b/libs/hwui/TextureCache.cpp
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "OpenGLRenderer"
+
+#include <GLES2/gl2.h>
+
+#include "TextureCache.h"
+
+namespace android {
+namespace uirenderer {
+
+///////////////////////////////////////////////////////////////////////////////
+// Constructors/destructor
+///////////////////////////////////////////////////////////////////////////////
+
+TextureCache::TextureCache(uint32_t maxByteSize):
+        mCache(GenerationCache<SkBitmap*, Texture*>::kUnlimitedCapacity),
+        mSize(0), mMaxSize(maxByteSize) {
+    mCache.setOnEntryRemovedListener(this);
+
+    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
+    LOGD("Maximum texture dimension is %d pixels", mMaxTextureSize);
+}
+
+TextureCache::~TextureCache() {
+    mCache.clear();
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Size management
+///////////////////////////////////////////////////////////////////////////////
+
+uint32_t TextureCache::getSize() {
+    return mSize;
+}
+
+uint32_t TextureCache::getMaxSize() {
+    return mMaxSize;
+}
+
+void TextureCache::setMaxSize(uint32_t maxSize) {
+    mMaxSize = maxSize;
+    while (mSize > mMaxSize) {
+        mCache.removeOldest();
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Callbacks
+///////////////////////////////////////////////////////////////////////////////
+
+void TextureCache::operator()(SkBitmap*& bitmap, Texture*& texture) {
+    if (bitmap) {
+        const uint32_t size = bitmap->rowBytes() * bitmap->height();
+        mSize -= size;
+    }
+
+    if (texture) {
+        glDeleteTextures(1, &texture->id);
+        delete texture;
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Caching
+///////////////////////////////////////////////////////////////////////////////
+
+Texture* TextureCache::get(SkBitmap* bitmap) {
+    Texture* texture = mCache.get(bitmap);
+    if (!texture) {
+        if (bitmap->width() > mMaxTextureSize || bitmap->height() > mMaxTextureSize) {
+            LOGW("Bitmap too large to be uploaded into a texture");
+            return NULL;
+        }
+
+        const uint32_t size = bitmap->rowBytes() * bitmap->height();
+        // Don't even try to cache a bitmap that's bigger than the cache
+        if (size < mMaxSize) {
+            while (mSize + size > mMaxSize) {
+                mCache.removeOldest();
+            }
+        }
+
+        texture = new Texture;
+        generateTexture(bitmap, texture, false);
+
+        if (size < mMaxSize) {
+            mSize += size;
+            mCache.put(bitmap, texture);
+        } else {
+            texture->cleanup = true;
+        }
+    } else if (bitmap->getGenerationID() != texture->generation) {
+        generateTexture(bitmap, texture, true);
+    }
+
+    return texture;
+}
+
+void TextureCache::remove(SkBitmap* bitmap) {
+    mCache.remove(bitmap);
+}
+
+void TextureCache::clear() {
+    mCache.clear();
+}
+
+void TextureCache::generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate) {
+    SkAutoLockPixels alp(*bitmap);
+    if (!bitmap->readyToDraw()) {
+        LOGE("Cannot generate texture from bitmap");
+        return;
+    }
+
+    if (!regenerate) {
+        texture->generation = bitmap->getGenerationID();
+        texture->width = bitmap->width();
+        texture->height = bitmap->height();
+
+        glGenTextures(1, &texture->id);
+    }
+
+    glBindTexture(GL_TEXTURE_2D, texture->id);
+    glPixelStorei(GL_UNPACK_ALIGNMENT, bitmap->bytesPerPixel());
+
+    switch (bitmap->getConfig()) {
+    case SkBitmap::kA8_Config:
+        texture->blend = true;
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, bitmap->rowBytesAsPixels(), texture->height, 0,
+                GL_ALPHA, GL_UNSIGNED_BYTE, bitmap->getPixels());
+        break;
+    case SkBitmap::kRGB_565_Config:
+        texture->blend = false;
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, bitmap->rowBytesAsPixels(), texture->height, 0,
+                GL_RGB, GL_UNSIGNED_SHORT_5_6_5, bitmap->getPixels());
+        break;
+    case SkBitmap::kARGB_8888_Config:
+        texture->blend = !bitmap->isOpaque();
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height, 0,
+                GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels());
+        break;
+    default:
+        break;
+    }
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+}
+
+}; // namespace uirenderer
+}; // namespace android