Author: desruisseaux
Date: Wed Aug 2 17:17:06 2017
New Revision: 1803883
URL: http://svn.apache.org/viewvc?rev=1803883&view=rev
Log:
Optimization for the common case where the requested region if fully contained
inside the current tile.
Modified:
sis/branches/JDK8/core/sis-raster/src/main/java/org/apache/sis/image/DefaultIterator.java
Modified:
sis/branches/JDK8/core/sis-raster/src/main/java/org/apache/sis/image/DefaultIterator.java
URL:
http://svn.apache.org/viewvc/sis/branches/JDK8/core/sis-raster/src/main/java/org/apache/sis/image/DefaultIterator.java?rev=1803883&r1=1803882&r2=1803883&view=diff
==============================================================================
---
sis/branches/JDK8/core/sis-raster/src/main/java/org/apache/sis/image/DefaultIterator.java
[UTF-8] (original)
+++
sis/branches/JDK8/core/sis-raster/src/main/java/org/apache/sis/image/DefaultIterator.java
[UTF-8] Wed Aug 2 17:17:06 2017
@@ -308,46 +308,57 @@ final class DefaultIterator extends Pixe
transfer = new double[window.length /*- numBands *
Math.min(windowWidth, windowHeight)*/];
// 'transfer' will always have at least one row or one column less
than 'window'.
}
- int subX = x; // Upper-left corner of a
sub-window inside the window.
- int subY = y;
+ Raster raster = currentRaster;
+ int subEndX = (raster.getMinX() - x) + raster.getWidth();
+ int subEndY = (raster.getMinY() - y) + raster.getHeight();
+ int subWidth = Math.min(windowWidth, subEndX);
+ int subHeight = Math.min(windowHeight, subEndY);
+ boolean fullWidth = (subWidth == windowWidth);
+ if (fullWidth && subHeight == windowHeight) {
+ /*
+ * Optimization for the case where the full window is inside
current raster.
+ * This is the vast majority of cases, so we perform this check
soon before
+ * to compute more internal variables.
+ */
+ return raster.getPixels(x, y, subWidth, subHeight, window);
+ }
+ /*
+ * At this point, we determined that the window is overlapping two or
more tiles.
+ * We will need more variables for iterating over the tiles around
'currentRaster'.
+ */
+ int destOffset = 0; // Index in 'window' array
where to copy the sample values.
+ int subX = 0; // Upper-left corner of a
sub-window inside the window.
+ int subY = 0;
int tileSubX = tileX; // The tile where is
located the (subX, subY) coordinate.
int tileSubY = tileY;
- final int endX = subX + windowWidth; // Upper limit of the full
window. May be located in another tile.
- final int endY = subY + windowHeight;
final int stride = windowWidth * numBands; // Number of samples
between two rows in the 'windows' array.
- Raster raster = currentRaster;
- int subEndX = raster.getMinX() + raster.getWidth();
- int subEndY = raster.getMinY() + raster.getHeight();
final int rewind = subEndX;
- int destOffset = 0; // Index in 'window' array
where to copy the sample values.
for (;;) {
- final int subWidth = Math.min(endX, subEndX) - subX;
- final int subHeight = Math.min(endY, subEndY) - subY;
if (subWidth > 0 && subHeight > 0) {
- final boolean fullWidth = (subWidth == windowWidth);
- if (fullWidth && subHeight == windowHeight) {
-// return raster.getPixels(subX, subY, subWidth, subHeight,
window);
- }
- transfer = raster.getPixels(subX, subY, subWidth, subHeight,
transfer);
- final int rowLength = numBands * subWidth;
- final int fullLength = rowLength * subHeight;
- for (int srcOffset=0; srcOffset < fullLength; srcOffset +=
rowLength) {
- System.arraycopy(transfer, srcOffset, window, destOffset,
rowLength);
- destOffset += stride;
+ final double[] data = raster.getPixels(x + subX, y + subY,
subWidth, subHeight, transfer);
+ if (fullWidth) {
+ final int fullLength = stride * subHeight;
+ System.arraycopy(data, 0, window, destOffset, fullLength);
+ destOffset += fullLength;
+ } else {
+ final int rowLength = numBands * subWidth;
+ final int fullLength = rowLength * subHeight;
+ for (int srcOffset=0; srcOffset < fullLength; srcOffset +=
rowLength) {
+ System.arraycopy(data, srcOffset, window, destOffset,
rowLength);
+ destOffset += stride;
+ }
}
}
/*
* At this point, we copied all sample values that we could obtain
from the current tile.
- * In most cases we will be done, since the window size should be
much smaller than the tile size.
- * However in a few cases the window overlaps more than one tile,
in which case we need to move to
- * next tile.
+ * Move to the next tile on current row, or if we reached the end
of row move to the next row.
*/
- if (subEndX < endX) {
+ if (subEndX < windowWidth) {
subX = subEndX;
subEndX += tileWidth; // Next tile on
the same row.
tileSubX++;
} else {
- if (subEndY >= endY) {
+ if (subEndY >= windowHeight) {
return window; // Completed last
row of tiles.
}
subY = subEndY;
@@ -355,10 +366,13 @@ final class DefaultIterator extends Pixe
tileSubY++;
tileSubX = tileX;
subEndX = rewind;
- subX = x; // Move x position
back to the window left border.
+ subX = 0; // Move x position
back to the window left border.
}
- raster = image.getTile(tileSubX, tileSubY);
- destOffset = ((subY - y) * windowWidth + (subX - x)) * numBands;
+ raster = image.getTile(tileSubX, tileSubY);
+ destOffset = (subY * windowWidth + subX) * numBands;
+ subWidth = Math.min(windowWidth, subEndX) - subX;
+ subHeight = Math.min(windowHeight, subEndY) - subY;
+ fullWidth = (subWidth == windowWidth);
}
}
}
