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Native cursors now have same origin as OpenGL, lower left corner

This commit is contained in:
Elias Naur 2003-08-05 20:46:03 +00:00
parent 683991fe79
commit e352e196bd
1 changed files with 32 additions and 6 deletions
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38
src/java/org/lwjgl/input/Cursor.java
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@ -48,9 +48,9 @@ import java.nio.IntBuffer;
public class Cursor {
static {
System.loadLibrary(Sys.getLibraryName());
}
static {
System.loadLibrary(Sys.getLibraryName());
}
/**
* The native handle to the cursor
@ -68,13 +68,39 @@ public class Cursor {
* @param xHotspot the x coordinate of the cursor hotspot
* @param yHotspot the y coordinate of the cursor hotspot
* @param numImages number of cursor images specified. Must be 1 if animations are not supported.
* @param images A buffer containing the images
* @param images A buffer containing the images. The origin is at the lower left corner, like OpenGL.
* @param delays An int buffer of animation frame delays, if numImages is greater than 1, else null
* @throws Exception if the cursor could not be created for any reason
* @throws Exception if the cursor could not be created for any reason
*/
public Cursor(int width, int height, int xHotspot, int yHotspot, int numImages, IntBuffer images, IntBuffer delays) throws Exception {
assert Mouse.isCreated();
nativeHandle = nCreateCursor(width, height, xHotspot, yHotspot, numImages, images, images.position(), delays, delays != null ? delays.position() : 0);
assert width*height*numImages <= images.remaining(): "width*height*numImages > images.remaining()";
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);
}
private static void flipImages(int width, int height, int numImages, IntBuffer images) {
for (int i = 0; i < numImages; i++) {
int start_index = i*width*height + images.position();
flipImage(width, height, start_index, images);
}
}
private static void flipImage(int width, int height, int start_index, IntBuffer images) {
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);
}
}
}
/**