Framework-side of SurfaceView#getBitmap
Bug: 27708453
Change-Id: Ie6fd7eca522d3e6549d8af587c975fd7e6053649
diff --git a/libs/hwui/Readback.cpp b/libs/hwui/Readback.cpp
new file mode 100644
index 0000000..d7df77c
--- /dev/null
+++ b/libs/hwui/Readback.cpp
@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#include "Readback.h"
+
+#include "Caches.h"
+#include "Image.h"
+#include "GlopBuilder.h"
+#include "renderstate/RenderState.h"
+#include "renderthread/EglManager.h"
+#include "utils/GLUtils.h"
+
+#include <GLES2/gl2.h>
+#include <ui/Fence.h>
+#include <ui/GraphicBuffer.h>
+
+namespace android {
+namespace uirenderer {
+
+bool Readback::copySurfaceInto(renderthread::RenderThread& renderThread,
+ Surface& surface, SkBitmap* bitmap) {
+ // TODO: Clean this up and unify it with LayerRenderer::copyLayer,
+ // of which most of this is copied from.
+ renderThread.eglManager().initialize();
+
+ Caches& caches = Caches::getInstance();
+ RenderState& renderState = renderThread.renderState();
+ int destWidth = bitmap->width();
+ int destHeight = bitmap->height();
+ if (destWidth > caches.maxTextureSize
+ || destHeight > caches.maxTextureSize) {
+ ALOGW("Can't copy surface into bitmap, %dx%d exceeds max texture size %d",
+ destWidth, destHeight, caches.maxTextureSize);
+ return false;
+ }
+ GLuint fbo = renderState.createFramebuffer();
+ if (!fbo) {
+ ALOGW("Could not obtain an FBO");
+ return false;
+ }
+
+ SkAutoLockPixels alp(*bitmap);
+
+ GLuint texture;
+
+ GLenum format;
+ GLenum type;
+
+ switch (bitmap->colorType()) {
+ case kAlpha_8_SkColorType:
+ format = GL_ALPHA;
+ type = GL_UNSIGNED_BYTE;
+ break;
+ case kRGB_565_SkColorType:
+ format = GL_RGB;
+ type = GL_UNSIGNED_SHORT_5_6_5;
+ break;
+ case kARGB_4444_SkColorType:
+ format = GL_RGBA;
+ type = GL_UNSIGNED_SHORT_4_4_4_4;
+ break;
+ case kN32_SkColorType:
+ default:
+ format = GL_RGBA;
+ type = GL_UNSIGNED_BYTE;
+ break;
+ }
+
+ renderState.bindFramebuffer(fbo);
+
+ // TODO: Use layerPool or something to get this maybe? But since we
+ // need explicit format control we can't currently.
+
+ // Setup the rendertarget
+ glGenTextures(1, &texture);
+ caches.textureState().activateTexture(0);
+ caches.textureState().bindTexture(texture);
+ glPixelStorei(GL_PACK_ALIGNMENT, bitmap->bytesPerPixel());
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ glTexImage2D(GL_TEXTURE_2D, 0, format, destWidth, destHeight,
+ 0, format, type, nullptr);
+ glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+ GL_TEXTURE_2D, texture, 0);
+
+ // Setup the source
+ sp<GraphicBuffer> sourceBuffer;
+ sp<Fence> sourceFence;
+ // FIXME: Waiting on an API from libgui for this
+ // surface.getLastQueuedBuffer(&sourceBuffer, &sourceFence);
+ if (!sourceBuffer.get()) {
+ ALOGW("Surface doesn't have any previously queued frames, nothing to readback from");
+ return false;
+ }
+ int err = sourceFence->wait(500 /* ms */);
+ if (err != NO_ERROR) {
+ ALOGE("Timeout (500ms) exceeded waiting for buffer fence, abandoning readback attempt");
+ return false;
+ }
+ Image sourceImage(sourceBuffer);
+ if (!sourceImage.getTexture()) {
+ ALOGW("Failed to make an EGLImage from the GraphicBuffer");
+ return false;
+ }
+ Texture sourceTexture(caches);
+ sourceTexture.wrap(sourceImage.getTexture(),
+ sourceBuffer->getWidth(), sourceBuffer->getHeight(), 0 /* total lie */);
+
+ {
+ // Draw & readback
+ renderState.setViewport(destWidth, destHeight);
+ renderState.scissor().setEnabled(false);
+ renderState.blend().syncEnabled();
+ renderState.stencil().disable();
+
+ Rect destRect(destWidth, destHeight);
+ Glop glop;
+ GlopBuilder(renderState, caches, &glop)
+ .setRoundRectClipState(nullptr)
+ .setMeshTexturedUvQuad(nullptr, Rect(0, 1, 1, 0)) // TODO: simplify with VBO
+ .setFillLayer(sourceTexture, nullptr, 1.0f, SkXfermode::kSrc_Mode,
+ Blend::ModeOrderSwap::NoSwap)
+ .setTransform(Matrix4::identity(), TransformFlags::None)
+ .setModelViewMapUnitToRect(destRect)
+ .build();
+ Matrix4 ortho;
+ ortho.loadOrtho(destWidth, destHeight);
+ renderState.render(glop, ortho);
+
+ glReadPixels(0, 0, bitmap->width(), bitmap->height(), format,
+ type, bitmap->getPixels());
+ }
+
+ // Cleanup
+ caches.textureState().deleteTexture(texture);
+ renderState.deleteFramebuffer(fbo);
+
+ GL_CHECKPOINT(MODERATE);
+
+ return true;
+}
+
+} // namespace uirenderer
+} // namespace android