1 /*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2021 Sam Lantinga <slouken@libsdl.org>
4
5 This software is provided 'as-is', without any express or implied
6 warranty. In no event will the authors be held liable for any damages
7 arising from the use of this software.
8
9 Permission is granted to anyone to use this software for any purpose,
10 including commercial applications, and to alter it and redistribute it
11 freely, subject to the following restrictions:
12
13 1. The origin of this software must not be misrepresented; you must not
14 claim that you wrote the original software. If you use this software
15 in a product, an acknowledgment in the product documentation would be
16 appreciated but is not required.
17 2. Altered source versions must be plainly marked as such, and must not be
18 misrepresented as being the original software.
19 3. This notice may not be removed or altered from any source distribution.
20 */
21 #include "../../SDL_internal.h"
22
23 #if SDL_VIDEO_DRIVER_OS2
24
25 #include "SDL_os2util.h"
26
utilCreatePointer(SDL_Surface * surface,ULONG ulHotX,ULONG ulHotY)27 HPOINTER utilCreatePointer(SDL_Surface *surface, ULONG ulHotX, ULONG ulHotY)
28 {
29 HBITMAP hbm;
30 BITMAPINFOHEADER2 bmih = { 0 };
31 BITMAPINFO bmi = { 0 };
32 HPS hps;
33 PULONG pulBitmap;
34 PULONG pulDst, pulSrc, pulDstMask;
35 ULONG ulY, ulX;
36 HPOINTER hptr = NULLHANDLE;
37
38 if (surface->format->format != SDL_PIXELFORMAT_ARGB8888) {
39 debug_os2("Image format should be SDL_PIXELFORMAT_ARGB8888");
40 return NULLHANDLE;
41 }
42
43 pulBitmap = SDL_malloc(surface->h * surface->w * 4 * 2);
44 if (pulBitmap == NULL) {
45 SDL_OutOfMemory();
46 return NULLHANDLE;
47 }
48
49 /* pulDst - last line of surface (image) part of the result bitmap */
50 pulDst = &pulBitmap[ (surface->h - 1) * surface->w ];
51 /* pulDstMask - last line of mask part of the result bitmap */
52 pulDstMask = &pulBitmap[ (2 * surface->h - 1) * surface->w ];
53 /* pulSrc - first line of source image */
54 pulSrc = (PULONG)surface->pixels;
55
56 for (ulY = 0; ulY < surface->h; ulY++) {
57 for (ulX = 0; ulX < surface->w; ulX++) {
58 if ((pulSrc[ulX] & 0xFF000000) == 0) {
59 pulDst[ulX] = 0;
60 pulDstMask[ulX] = 0xFFFFFFFF;
61 } else {
62 pulDst[ulX] = pulSrc[ulX] & 0xFFFFFF;
63 pulDstMask[ulX] = 0;
64 }
65 }
66
67 /* Set image and mask pointers on one line up */
68 pulDst -= surface->w;
69 pulDstMask -= surface->w;
70 /* Set source image pointer to the next line */
71 pulSrc = (PULONG) (((PCHAR)pulSrc) + surface->pitch);
72 }
73
74 /* Create system bitmap object. */
75 bmih.cbFix = sizeof(BITMAPINFOHEADER2);
76 bmih.cx = surface->w;
77 bmih.cy = 2 * surface->h;
78 bmih.cPlanes = 1;
79 bmih.cBitCount = 32;
80 bmih.ulCompression = BCA_UNCOMP;
81 bmih.cbImage = bmih.cx * bmih.cy * 4;
82
83 bmi.cbFix = sizeof(BITMAPINFOHEADER);
84 bmi.cx = bmih.cx;
85 bmi.cy = bmih.cy;
86 bmi.cPlanes = 1;
87 bmi.cBitCount = 32;
88
89 hps = WinGetPS(HWND_DESKTOP);
90 hbm = GpiCreateBitmap(hps, (PBITMAPINFOHEADER2)&bmih, CBM_INIT,
91 (PBYTE)pulBitmap, (PBITMAPINFO2)&bmi);
92 if (hbm == GPI_ERROR) {
93 debug_os2("GpiCreateBitmap() failed");
94 } else {
95 /* Create a system pointer object. */
96 hptr = WinCreatePointer(HWND_DESKTOP, hbm, TRUE, ulHotX, ulHotY);
97 if (hptr == NULLHANDLE) {
98 debug_os2("WinCreatePointer() failed");
99 }
100 }
101 GpiDeleteBitmap(hbm);
102
103 WinReleasePS(hps);
104 SDL_free(pulBitmap);
105
106 return hptr;
107 }
108
109 #endif /* SDL_VIDEO_DRIVER_OS2 */
110
111 /* vi: set ts=4 sw=4 expandtab: */
112