Pack preloaded framework assets in a texture atlas
When the Android runtime starts, the system preloads a series of assets
in the Zygote process. These assets are shared across all processes.
Unfortunately, each one of these assets is later uploaded in its own
OpenGL texture, once per process. This wastes memory and generates
unnecessary OpenGL state changes.
This CL introduces an asset server that provides an atlas to all processes.
Note: bitmaps used by skia shaders are *not* sampled from the atlas.
It's an uncommon use case and would require extra texture transforms
in the GL shaders.
WHAT IS THE ASSETS ATLAS
The "assets atlas" is a single, shareable graphic buffer that contains
all the system's preloaded bitmap drawables (this includes 9-patches.)
The atlas is made of two distinct objects: the graphic buffer that
contains the actual pixels and the map which indicates where each
preloaded bitmap can be found in the atlas (essentially a pair of
x and y coordinates.)
HOW IS THE ASSETS ATLAS GENERATED
Because we need to support a wide variety of devices and because it
is easy to change the list of preloaded drawables, the atlas is
generated at runtime, during the startup phase of the system process.
There are several steps that lead to the atlas generation:
1. If the device is booting for the first time, or if the device was
updated, we need to find the best atlas configuration. To do so,
the atlas service tries a number of width, height and algorithm
variations that allows us to pack as many assets as possible while
using as little memory as possible. Once a best configuration is found,
it gets written to disk in /data/system/framework_atlas
2. Given a best configuration (algorithm variant, dimensions and
number of bitmaps that can be packed in the atlas), the atlas service
packs all the preloaded bitmaps into a single graphic buffer object.
3. The packing is done using Skia in a temporary native bitmap. The
Skia bitmap is then copied into the graphic buffer using OpenGL ES
to benefit from texture swizzling.
HOW PROCESSES USE THE ATLAS
Whenever a process' hardware renderer initializes its EGL context,
it queries the atlas service for the graphic buffer and the map.
It is important to remember that both the context and the map will
be valid for the lifetime of the hardware renderer (if the system
process goes down, all apps get killed as well.)
Every time the hardware renderer needs to render a bitmap, it first
checks whether the bitmap can be found in the assets atlas. When
the bitmap is part of the atlas, texture coordinates are remapped
appropriately before rendering.
Change-Id: I8eaecf53e7f6a33d90da3d0047c5ceec89ea3af0
diff --git a/libs/hwui/DisplayListOp.h b/libs/hwui/DisplayListOp.h
index a0290e3..990372e 100644
--- a/libs/hwui/DisplayListOp.h
+++ b/libs/hwui/DisplayListOp.h
@@ -26,8 +26,10 @@
#include <private/hwui/DrawGlInfo.h>
#include "OpenGLRenderer.h"
+#include "AssetAtlas.h"
#include "DeferredDisplayList.h"
#include "DisplayListRenderer.h"
+#include "UvMapper.h"
#include "utils/LinearAllocator.h"
#define CRASH() do { \
@@ -721,7 +723,6 @@
int mSetBits;
};
-
///////////////////////////////////////////////////////////////////////////////
// DRAW OPERATIONS - these are operations that can draw to the canvas's device
///////////////////////////////////////////////////////////////////////////////
@@ -729,9 +730,16 @@
class DrawBitmapOp : public DrawBoundedOp {
public:
DrawBitmapOp(SkBitmap* bitmap, float left, float top, SkPaint* paint)
- : DrawBoundedOp(left, top, left + bitmap->width(), top + bitmap->height(),
- paint),
- mBitmap(bitmap) {}
+ : DrawBoundedOp(left, top, left + bitmap->width(), top + bitmap->height(), paint),
+ mBitmap(bitmap), mAtlasEntry(NULL) {
+ }
+
+ DrawBitmapOp(SkBitmap* bitmap, float left, float top, SkPaint* paint,
+ const AssetAtlas::Entry* entry)
+ : DrawBoundedOp(left, top, left + bitmap->width(), top + bitmap->height(), paint),
+ mBitmap(bitmap), mAtlasEntry(entry) {
+ if (entry) mUvMapper = entry->uvMapper;
+ }
virtual status_t applyDraw(OpenGLRenderer& renderer, Rect& dirty) {
return renderer.drawBitmap(mBitmap, mLocalBounds.left, mLocalBounds.top,
@@ -749,14 +757,14 @@
TextureVertex vertices[6 * ops.size()];
TextureVertex* vertex = &vertices[0];
- // TODO: manually handle rect clip for bitmaps by adjusting texCoords per op, and allowing
- // them to be merged in getBatchId()
- const Rect texCoords(0, 0, 1, 1);
-
- const float width = mBitmap->width();
- const float height = mBitmap->height();
+ // TODO: manually handle rect clip for bitmaps by adjusting texCoords per op,
+ // and allowing them to be merged in getBatchId()
for (unsigned int i = 0; i < ops.size(); i++) {
const Rect& opBounds = ops[i]->state.mBounds;
+
+ Rect texCoords(0, 0, 1, 1);
+ ((DrawBitmapOp*) ops[i])->mUvMapper.map(texCoords);
+
SET_TEXTURE(vertex, opBounds, bounds, texCoords, left, top);
SET_TEXTURE(vertex, opBounds, bounds, texCoords, right, top);
SET_TEXTURE(vertex, opBounds, bounds, texCoords, left, bottom);
@@ -777,7 +785,7 @@
virtual bool onDefer(OpenGLRenderer& renderer, int* batchId, mergeid_t* mergeId) {
*batchId = DeferredDisplayList::kOpBatch_Bitmap;
- *mergeId = (mergeid_t)mBitmap;
+ *mergeId = mAtlasEntry ? (mergeid_t) &mAtlasEntry->atlas : (mergeid_t) mBitmap;
// don't merge A8 bitmaps - the paint's color isn't compared by mergeId, or in
// MergingDrawBatch::canMergeWith
@@ -787,6 +795,8 @@
const SkBitmap* bitmap() { return mBitmap; }
protected:
SkBitmap* mBitmap;
+ const AssetAtlas::Entry* mAtlasEntry;
+ UvMapper mUvMapper;
};
class DrawBitmapMatrixOp : public DrawBoundedOp {
@@ -904,20 +914,16 @@
class DrawPatchOp : public DrawBoundedOp {
public:
- DrawPatchOp(SkBitmap* bitmap, const int32_t* xDivs,
- const int32_t* yDivs, const uint32_t* colors, uint32_t width, uint32_t height,
- int8_t numColors, float left, float top, float right, float bottom,
- int alpha, SkXfermode::Mode mode)
+ DrawPatchOp(SkBitmap* bitmap, Res_png_9patch* patch,
+ float left, float top, float right, float bottom, int alpha, SkXfermode::Mode mode)
: DrawBoundedOp(left, top, right, bottom, 0),
- mBitmap(bitmap), mxDivs(xDivs), myDivs(yDivs),
- mColors(colors), mxDivsCount(width), myDivsCount(height),
- mNumColors(numColors), mAlpha(alpha), mMode(mode) {};
+ mBitmap(bitmap), mPatch(patch), mAlpha(alpha), mMode(mode) {
+ mEntry = Caches::getInstance().assetAtlas.getEntry(bitmap);
+ };
virtual status_t applyDraw(OpenGLRenderer& renderer, Rect& dirty) {
// NOTE: not calling the virtual method, which takes a paint
- return renderer.drawPatch(mBitmap, mxDivs, myDivs, mColors,
- mxDivsCount, myDivsCount, mNumColors,
- mLocalBounds.left, mLocalBounds.top,
+ return renderer.drawPatch(mBitmap, mPatch, mEntry, mLocalBounds.left, mLocalBounds.top,
mLocalBounds.right, mLocalBounds.bottom, mAlpha, mMode);
}
@@ -929,20 +935,16 @@
virtual bool onDefer(OpenGLRenderer& renderer, int* batchId, mergeid_t* mergeId) {
*batchId = DeferredDisplayList::kOpBatch_Patch;
- *mergeId = (mergeid_t)mBitmap;
+ *mergeId = (mergeid_t) mBitmap;
return true;
}
private:
SkBitmap* mBitmap;
- const int32_t* mxDivs;
- const int32_t* myDivs;
- const uint32_t* mColors;
- uint32_t mxDivsCount;
- uint32_t myDivsCount;
- int8_t mNumColors;
+ Res_png_9patch* mPatch;
int mAlpha;
SkXfermode::Mode mMode;
+ AssetAtlas::Entry* mEntry;
};
class DrawColorOp : public DrawOp {