Add support for linear gradients.
Change-Id: Id15329da065045b3f06fdaed615f33cd57608496
diff --git a/libs/hwui/GradientCache.cpp b/libs/hwui/GradientCache.cpp
new file mode 100644
index 0000000..aeda416
--- /dev/null
+++ b/libs/hwui/GradientCache.cpp
@@ -0,0 +1,160 @@
+/*
+ * 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 <SkCanvas.h>
+#include <SkGradientShader.h>
+
+#include "GradientCache.h"
+
+namespace android {
+namespace uirenderer {
+
+///////////////////////////////////////////////////////////////////////////////
+// Constructors/destructor
+///////////////////////////////////////////////////////////////////////////////
+
+GradientCache::GradientCache(uint32_t maxByteSize):
+ mCache(GenerationCache<SkShader*, Texture*>::kUnlimitedCapacity),
+ mSize(0), mMaxSize(maxByteSize) {
+ mCache.setOnEntryRemovedListener(this);
+}
+
+GradientCache::~GradientCache() {
+ mCache.clear();
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Size management
+///////////////////////////////////////////////////////////////////////////////
+
+uint32_t GradientCache::getSize() {
+ return mSize;
+}
+
+uint32_t GradientCache::getMaxSize() {
+ return mMaxSize;
+}
+
+void GradientCache::setMaxSize(uint32_t maxSize) {
+ mMaxSize = maxSize;
+ while (mSize > mMaxSize) {
+ mCache.removeOldest();
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Callbacks
+///////////////////////////////////////////////////////////////////////////////
+
+void GradientCache::operator()(SkShader*& shader, Texture*& texture) {
+ if (shader) {
+ const uint32_t size = texture->width * texture->height * 4;
+ mSize -= size;
+ }
+
+ if (texture) {
+ glDeleteTextures(1, &texture->id);
+ delete texture;
+ }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// Caching
+///////////////////////////////////////////////////////////////////////////////
+
+Texture* GradientCache::get(SkShader* shader) {
+ Texture* texture = mCache.get(shader);
+ return texture;
+}
+
+void GradientCache::remove(SkShader* shader) {
+ mCache.remove(shader);
+}
+
+void GradientCache::clear() {
+ mCache.clear();
+}
+
+Texture* GradientCache::addLinearGradient(SkShader* shader, float* bounds, uint32_t* colors,
+ float* positions, int count, SkShader::TileMode tileMode) {
+ SkBitmap bitmap;
+ bitmap.setConfig(SkBitmap::kARGB_8888_Config, 1024, 1);
+ bitmap.allocPixels();
+ bitmap.eraseColor(0);
+
+ SkCanvas canvas(bitmap);
+
+ SkPoint points[2];
+ points[0].set(0.0f, 0.0f);
+ points[1].set(bitmap.width(), 0.0f);
+
+ SkShader* localShader = SkGradientShader::CreateLinear(points,
+ reinterpret_cast<const SkColor*>(colors), positions, count, tileMode);
+
+ SkPaint p;
+ p.setStyle(SkPaint::kStrokeAndFill_Style);
+ p.setShader(localShader)->unref();
+
+ canvas.drawRectCoords(0.0f, 0.0f, bitmap.width(), 1.0f, p);
+
+ // Asume the cache is always big enough
+ const uint32_t size = bitmap.rowBytes() * bitmap.height();
+ while (mSize + size > mMaxSize) {
+ mCache.removeOldest();
+ }
+
+ Texture* texture = new Texture;
+ generateTexture(&bitmap, texture);
+
+ mSize += size;
+ mCache.put(shader, texture);
+
+ return texture;
+}
+
+void GradientCache::generateTexture(SkBitmap* bitmap, Texture* texture) {
+ SkAutoLockPixels autoLock(*bitmap);
+ if (!bitmap->readyToDraw()) {
+ LOGE("Cannot generate texture from shader");
+ return;
+ }
+
+ 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());
+
+ texture->blend = !bitmap->isOpaque();
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, bitmap->rowBytesAsPixels(), texture->height, 0,
+ GL_RGBA, GL_UNSIGNED_BYTE, bitmap->getPixels());
+
+ 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