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Bitmap: implement pixel buffer access

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For GPU textures, the GdkTextureDownloader will take care of format
conversions, so the application never sees the actual format.

If the application calls AndroidBitmap_unlockPixels(), the texture is
converted into a GdkMemoryTexture and can be accessed zero copy.
This commit is contained in:
Julian Winkler
2024-12-22 10:20:50 +01:00
parent 7695aadf91
commit 260821d68c
4 changed files with 130 additions and 21 deletions
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58
src/api-impl/android/graphics/Bitmap.java
View File

@@ -1,5 +1,7 @@
package android.graphics;
import java.nio.Buffer;
import android.util.DisplayMetrics;
/*
@@ -9,28 +11,42 @@ import android.util.DisplayMetrics;
public final class Bitmap {
public enum Config {
RGB_565,
ARGB_8888,
ARGB_4444,
ALPHA_8,
RGB_565(2, -1, /*ANDROID_BITMAP_FORMAT_RGB_565*/4),
ARGB_8888(4, /*GDK_MEMORY_R8G8B8A8*/5, /**ANDROID_BITMAP_FORMAT_RGBA_8888*/1),
ARGB_4444(2, -1, /*ANDROID_BITMAP_FORMAT_RGBA_4444*/7),
ALPHA_8(1, /*GDK_MEMORY_A8*/ 24, /*ANDROID_BITMAP_FORMAT_A_8*/8);
private int bytes_per_pixel;
private int gdk_memory_format;
int android_memory_format; // used by native function AndroidBitmap_getInfo()
private Config(int bytes_per_pixel, int gdk_memory_format, int android_memory_format) {
this.bytes_per_pixel = bytes_per_pixel;
this.gdk_memory_format = gdk_memory_format;
this.android_memory_format = android_memory_format;
}
}
private int width;
private int height;
private int stride;
private long texture;
private long snapshot;
private Config config = Config.ARGB_8888;
private boolean hasAlpha = true;
long bytes = 0; // used by native function AndroidBitmap_lockPixels()
Bitmap(long texture) {
this(native_get_width(texture), native_get_height(texture), Config.ARGB_8888);
this.texture = texture;
this.width = native_get_width(texture);
this.height = native_get_height(texture);
}
private Bitmap(int width, int height, Config config) {
this.config = config;
this.width = width;
this.height = height;
int stride = width * config.bytes_per_pixel;
this.stride = (stride + 3) & ~3; // 4-byte alignment
}
public static Bitmap createBitmap(int width, int height, Config config) {
@@ -42,7 +58,9 @@ public final class Bitmap {
}
public static Bitmap createBitmap(DisplayMetrics metrics, int width, int height, Config config, boolean hasAlpha, ColorSpace colorSpace) {
return new Bitmap(width, height, config);
Bitmap bitmap = new Bitmap(width, height, config);
bitmap.hasAlpha = hasAlpha;
return bitmap;
}
public static Bitmap createBitmap(Bitmap src, int x, int y, int width, int height) {
@@ -109,8 +127,12 @@ public final class Bitmap {
snapshot = 0;
}
public int getRowBytes() {
return stride;
}
public int getAllocationByteCount() {
return width * height * 4;
return height * getRowBytes();
}
public void prepareToDraw() {
@@ -131,9 +153,15 @@ public final class Bitmap {
return texture == 0 && snapshot == 0;
}
public void setHasAlpha(boolean hasAlpha) {}
public void setHasAlpha(boolean hasAlpha) {
this.hasAlpha = hasAlpha;
}
public Bitmap copy(Bitmap.Config config, boolean hasAlpha) {
public boolean hasAlpha() {
return hasAlpha;
}
public Bitmap copy(Bitmap.Config config, boolean isMutable) {
Bitmap bitmap = new Bitmap(width, height, config);
bitmap.texture = native_ref_texture(getTexture());
return bitmap;
@@ -143,6 +171,15 @@ public final class Bitmap {
native_get_pixels(getTexture(), pixels, offset, stride, x, y, width, height);
}
public void copyPixelsToBuffer(Buffer buffer) {
if (config.gdk_memory_format == -1) {
System.out.println("copyPixelsToBuffer: format " + config.name() + " not implemented");
System.exit(1);
}
native_copy_to_buffer(getTexture(), buffer, config.gdk_memory_format, getRowBytes());
buffer.position(buffer.position() + getAllocationByteCount());
}
@SuppressWarnings("deprecation")
@Override
protected void finalize() throws Throwable {
@@ -161,4 +198,5 @@ public final class Bitmap {
private static native void native_recycle(long texture, long snapshot);
private static native long native_ref_texture(long texture);
private static native void native_get_pixels(long texture, int[] pixels, int offset, int stride, int x, int y, int width, int height);
private static native void native_copy_to_buffer(long texture, Buffer buffer, int memory_format, int stride);
}