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Flip cursor images in a copy buffer, not the user buffer

This commit is contained in:
Elias Naur 2003-08-10 19:18:02 +00:00
parent 0886f84ed8
commit 0b55322fc2
1 changed files with 12 additions and 9 deletions
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21
src/java/org/lwjgl/input/Cursor.java
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@ -35,6 +35,8 @@ package org.lwjgl.input;
import org.lwjgl.Sys;
import java.nio.IntBuffer;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
/**
* $Id$
@ -78,27 +80,28 @@ public class Cursor {
assert delays == null || numImages <= delays.remaining(): "delays != null && numImages > delays.remaining()";
assert xHotspot <= width && xHotspot >= 0: "xHotspot > width || xHotspot < 0";
assert yHotspot <= height && yHotspot >= 0: "yHotspot > height || yHotspot < 0";
flipImages(width, height, numImages, images);
nativeHandle = nCreateCursor(width, height, xHotspot, height - yHotspot, numImages, images, images.position(), delays, delays != null ? delays.position() : 0);
IntBuffer images_copy = ByteBuffer.allocateDirect(images.remaining()*4).order(ByteOrder.nativeOrder()).asIntBuffer();
flipImages(width, height, numImages, images, images_copy);
nativeHandle = nCreateCursor(width, height, xHotspot, height - yHotspot, numImages, images_copy, 0, delays, delays != null ? delays.position() : 0);
}
private static void flipImages(int width, int height, int numImages, IntBuffer images) {
private static void flipImages(int width, int height, int numImages, IntBuffer images, IntBuffer images_copy) {
for (int i = 0; i < numImages; i++) {
int start_index = i*width*height + images.position();
flipImage(width, height, start_index, images);
int start_index = i*width*height;
flipImage(width, height, start_index, images, images_copy);
}
}
private static void flipImage(int width, int height, int start_index, IntBuffer images) {
private static void flipImage(int width, int height, int start_index, IntBuffer images, IntBuffer images_copy) {
for (int y = 0; y < height>>1; y++) {
int index_y_1 = y*width + start_index;
int index_y_2 = (height - y - 1)*width + start_index;
for (int x = 0; x < width; x++) {
int index1 = index_y_1 + x;
int index2 = index_y_2 + x;
int temp_pixel = images.get(index1);
images.put(index1, images.get(index2));
images.put(index2, temp_pixel);
int temp_pixel = images.get(index1 + images.position());
images_copy.put(index1, images.get(index2 + images.position()));
images_copy.put(index2, temp_pixel);
}
}
}