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WebP minor bugfix and optimization.

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(cherry picked from commit 1794e336dea71fe33cccccc3ce442d64de3f0ab8)
This commit is contained in:
Harald Kuhr 2023-03-18 11:34:24 +01:00
parent 67b9e7df11
commit f27b5700e8
1 changed files with 6 additions and 7 deletions
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13
imageio/imageio-webp/src/main/java/com/twelvemonkeys/imageio/plugins/webp/lossless/VP8LDecoder.java
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@ -140,11 +140,10 @@ public final class VP8LDecoder {
}
/**
* Copy a source raster into a destination raster with settings applied.
* Copy a source raster into a destination raster with optional settings applied.
*/
public static void copyIntoRasterWithParams(final Raster srcRaster, final WritableRaster dstRaster,
final ImageReadParam param) {
Rectangle sourceRegion = param != null && param.getSourceRegion() != null ? param.getSourceRegion() : dstRaster.getBounds();
public static void copyIntoRasterWithParams(final Raster srcRaster, final WritableRaster dstRaster, final ImageReadParam param) {
Rectangle sourceRegion = param != null && param.getSourceRegion() != null ? param.getSourceRegion() : srcRaster.getBounds();
int sourceXSubsampling = param != null ? param.getSourceXSubsampling() : 1;
int sourceYSubsampling = param != null ? param.getSourceYSubsampling() : 1;
int subsamplingXOffset = param != null ? param.getSubsamplingXOffset() : 0;
@ -156,13 +155,13 @@ public final class VP8LDecoder {
dstRaster.setRect(destinationOffset.x, destinationOffset.y, srcRaster);
}
else {
// Manual copy, more efficient way might exist
// Subsampled case
byte[] rgba = new byte[4];
int xEnd = dstRaster.getWidth() + dstRaster.getMinX();
int yEnd = dstRaster.getHeight() + dstRaster.getMinY();
for (int xDst = destinationOffset.x, xSrc = sourceRegion.x + subsamplingXOffset; xDst < xEnd; xDst++, xSrc += sourceXSubsampling) {
for (int yDst = destinationOffset.y, ySrc = sourceRegion.y + subsamplingYOffset; yDst < yEnd; yDst++, ySrc += sourceYSubsampling) {
for (int yDst = destinationOffset.y, ySrc = sourceRegion.y + subsamplingYOffset; yDst < yEnd; yDst++, ySrc += sourceYSubsampling) {
for (int xDst = destinationOffset.x, xSrc = sourceRegion.x + subsamplingXOffset; xDst < xEnd; xDst++, xSrc += sourceXSubsampling) {
srcRaster.getDataElements(xSrc, ySrc, rgba);
dstRaster.setDataElements(xDst, yDst, rgba);
}