lwjgl/src/native/windows/org_lwjgl_input_Cursor.c

/* 
 * Copyright (c) 2002-2008 LWJGL Project
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are 
 * met:
 * 
 * * Redistributions of source code must retain the above copyright 
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'LWJGL' nor the names of 
 *   its contributors may be used to endorse or promote products derived 
 *   from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/**
 * $Id$
 *
 * win32 mouse handling.
 *
 * @author elias_naur <elias_naur@users.sourceforge.net>
 * @version $Revision$
 */

#include "Window.h"
#include "org_lwjgl_input_Cursor.h"
#include "org_lwjgl_opengl_WindowsDisplay.h"
#include "common_tools.h"

JNIEXPORT jobject JNICALL Java_org_lwjgl_opengl_WindowsDisplay_nCreateCursor
(JNIEnv *env, jclass unused, jint width, jint height, jint x_hotspot, jint y_hotspot, jint num_images, jobject image_buffer, jint images_offset, jobject delay_buffer, jint delays_offset)
{
	unsigned char col0, col1, col2, col3, col4, col5, col6, col7;
	unsigned char mask;
	BITMAPINFO bitmapInfo;

	HBITMAP cursorMask;
	HCURSOR *cursor_handle;

	HCURSOR cursor = NULL;
	ICONINFO iconInfo;
	char *ptrCursorImage;
	HBITMAP colorDIB;
	int  *srcPtr;
	char *dstPtr;
	int bitWidth;
	int scanlinePad;
	int imageSize; // Size in bits
	unsigned char *maskPixels;
	int pixelCount = 0;
	int maskCount = 0;
	HBITMAP	colorBitmap;
	int x, y;
	HDC hDC;
	jobject handle_buffer = newJavaManagedByteBuffer(env, sizeof(HCURSOR));

	int *pixels;
	if (handle_buffer == NULL) {
		throwException(env, "Could not allocate handle");
		return NULL;
	}
	pixels = (int *)(*env)->GetDirectBufferAddress(env, image_buffer) + images_offset;

	memset(&bitmapInfo, 0, sizeof(BITMAPINFO));
	bitmapInfo.bmiHeader.biSize              = sizeof(BITMAPINFOHEADER);
	bitmapInfo.bmiHeader.biWidth             = width;
	bitmapInfo.bmiHeader.biHeight            = -height;
	bitmapInfo.bmiHeader.biPlanes            = 1;

	bitmapInfo.bmiHeader.biBitCount          = 24;
	bitmapInfo.bmiHeader.biCompression       = BI_RGB;
	
	hDC = GetDC(NULL);

	colorDIB = CreateDIBSection(hDC, (BITMAPINFO*)&(bitmapInfo),
			DIB_RGB_COLORS,
			(void*)&(ptrCursorImage),
			NULL, 0);
	srcPtr = pixels;
	dstPtr = ptrCursorImage;
	if (!dstPtr) {
		throwException(env, "Could not allocate DIB section.");
		ReleaseDC(NULL, hDC);
		return NULL;
	}
	for (y = 0; y < height; y++ ) {
		for (x = 0; x < width; x++ ) {
			dstPtr[2] = (*srcPtr >> 0x10) & 0xFF;
			dstPtr[1] = (*srcPtr >> 0x08) & 0xFF;
			dstPtr[0] = *srcPtr & 0xFF;

			srcPtr++;
			dstPtr += 3;
		}
	}

	colorBitmap = CreateDIBitmap(hDC,
			(BITMAPINFOHEADER*)&bitmapInfo.bmiHeader,
			CBM_INIT,
			(void *)ptrCursorImage,
			(BITMAPINFO*)&bitmapInfo,
			DIB_RGB_COLORS);

	DeleteObject(colorDIB);

	// Convert alpha map to pixel packed mask
	bitWidth = width >> 3;
	scanlinePad = bitWidth & (sizeof(WORD) - 1);
	imageSize = (bitWidth + scanlinePad)*height; // Size in bits
	maskPixels = (unsigned char*)malloc(sizeof(unsigned char)*imageSize);
	memset(maskPixels, 0, imageSize);
	for (y = 0; y < height; y++)
		for (x = 0; x < bitWidth; x++) {
			col0 = (pixels[pixelCount++] & 0x01000000) >> 17;
			col1 = (pixels[pixelCount++] & 0x01000000) >> 18;
			col2 = (pixels[pixelCount++] & 0x01000000) >> 19;
			col3 = (pixels[pixelCount++] & 0x01000000) >> 20;
			col4 = (pixels[pixelCount++] & 0x01000000) >> 21;
			col5 = (pixels[pixelCount++] & 0x01000000) >> 22;
			col6 = (pixels[pixelCount++] & 0x01000000) >> 23;
			col7 = (pixels[pixelCount++] & 0x01000000) >> 24;
			mask = col0 | col1 | col2 | col3 | col4 | col5 | col6 | col7;
			maskPixels[maskCount++] = ~mask; // 1 is tranparant, 0 opaque
		}

	cursorMask = CreateBitmap(width, height, 1, 1, maskPixels);

	memset(&iconInfo, 0, sizeof(ICONINFO));
	iconInfo.hbmMask = cursorMask;
	iconInfo.hbmColor = colorBitmap;
	iconInfo.fIcon = FALSE;
	iconInfo.xHotspot = x_hotspot;
	iconInfo.yHotspot = y_hotspot;
	cursor = CreateIconIndirect(&iconInfo);
	DeleteObject(colorBitmap);
	DeleteObject(cursorMask);
	free(maskPixels);
	ReleaseDC(NULL, hDC);

	cursor_handle = (HCURSOR *)(*env)->GetDirectBufferAddress(env, handle_buffer);
	*cursor_handle = cursor;
	return handle_buffer;
}

JNIEXPORT void JNICALL Java_org_lwjgl_opengl_WindowsDisplay_doDestroyCursor
(JNIEnv *env, jclass unused, jobject handle_buffer)
{
	HCURSOR *cursor_handle = (HCURSOR *)(*env)->GetDirectBufferAddress(env, handle_buffer);
	DestroyCursor(*cursor_handle);
}