source: trunk/src/user32/dib.cpp@ 1482

Last change on this file since 1482 was 960, checked in by phaller, 26 years ago

Fix: DIB_FixColorsToLoadflags - incr was not initialized
File size: 5.7 KB
Line 
1/* $Id: dib.cpp,v 1.2 1999-09-16 14:57:05 phaller Exp $ */
2
3/*
4 * Win32 DIB functions for OS/2
5 *
6 * Copyright 1999 Sander van Leeuwen (OS/2 Port)
7 *
8 * Based on Wine code (objects\dib.c):
9 *
10 * GDI device-independent bitmaps
11 *
12 * Copyright 1993,1994 Alexandre Julliard
13 *
14 * Project Odin Software License can be found in LICENSE.TXT
15 *
16 *
17 */
18
19#include <os2win.h>
20#include <stdlib.h>
21#include <misc.h>
22
23/***********************************************************************
24 * DIB_GetDIBWidthBytes
25 *
26 * Return the width of a DIB bitmap in bytes. DIB bitmap data is 32-bit aligned.
27 * http://www.microsoft.com/msdn/sdk/platforms/doc/sdk/win32/struc/src/str01.htm
28 */
29int DIB_GetDIBWidthBytes( int width, int depth )
30{
31 int words;
32
33 switch(depth)
34 {
35 case 1: words = (width + 31) / 32; break;
36 case 4: words = (width + 7) / 8; break;
37 case 8: words = (width + 3) / 4; break;
38 case 15:
39 case 16: words = (width + 1) / 2; break;
40 case 24: words = (width * 3 + 3)/4; break;
41
42 default:
43 dprintf(("(%d): Unsupported depth\n", depth ));
44 /* fall through */
45 case 32:
46 words = width;
47 }
48 return 4 * words;
49}
50
51/***********************************************************************
52 * DIB_GetDIBImageBytes
53 *
54 * Return the number of bytes used to hold the image in a DIB bitmap.
55 */
56int DIB_GetDIBImageBytes( int width, int height, int depth )
57{
58 return DIB_GetDIBWidthBytes( width, depth ) * abs( height );
59}
60
61
62/***********************************************************************
63 * DIB_BitmapInfoSize
64 *
65 * Return the size of the bitmap info structure including color table.
66 */
67int DIB_BitmapInfoSize( BITMAPINFO * info, WORD coloruse )
68{
69 int colors;
70
71 if (info->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
72 {
73 BITMAPCOREHEADER *core = (BITMAPCOREHEADER *)info;
74 colors = (core->bcBitCount <= 8) ? 1 << core->bcBitCount : 0;
75 return sizeof(BITMAPCOREHEADER) + colors *
76 ((coloruse == DIB_RGB_COLORS) ? sizeof(RGBTRIPLE) : sizeof(WORD));
77 }
78 else /* assume BITMAPINFOHEADER */
79 {
80 colors = info->bmiHeader.biClrUsed;
81 if (!colors && (info->bmiHeader.biBitCount <= 8))
82 colors = 1 << info->bmiHeader.biBitCount;
83 return sizeof(BITMAPINFOHEADER) + colors *
84 ((coloruse == DIB_RGB_COLORS) ? sizeof(RGBQUAD) : sizeof(WORD));
85 }
86}
87
88
89/***********************************************************************
90 * DIB_GetBitmapInfo
91 *
92 * Get the info from a bitmap header.
93 * Return 1 for INFOHEADER, 0 for COREHEADER, -1 for error.
94 */
95int DIB_GetBitmapInfo( const BITMAPINFOHEADER *header, DWORD *width,
96 int *height, WORD *bpp, WORD *compr )
97{
98 if (header->biSize == sizeof(BITMAPINFOHEADER))
99 {
100 *width = header->biWidth;
101 *height = header->biHeight;
102 *bpp = header->biBitCount;
103 *compr = header->biCompression;
104 return 1;
105 }
106 if (header->biSize == sizeof(BITMAPCOREHEADER))
107 {
108 BITMAPCOREHEADER *core = (BITMAPCOREHEADER *)header;
109 *width = core->bcWidth;
110 *height = core->bcHeight;
111 *bpp = core->bcBitCount;
112 *compr = 0;
113 return 0;
114 }
115 dprintf(("(%ld): wrong size for header\n", header->biSize ));
116 return -1;
117}
118
119/***********************************************************************
120 * DIB_FixColorsToLoadflags
121 *
122 * Change color table entries when LR_LOADTRANSPARENT or LR_LOADMAP3DCOLORS
123 * are in loadflags
124 */
125void DIB_FixColorsToLoadflags(BITMAPINFO * bmi, UINT loadflags, BYTE pix)
126{
127 int colors, bitcount;
128 COLORREF c_W, c_S, c_F, c_L, c_C;
129 int incr,i;
130 RGBQUAD *ptr;
131 char *colorptr;
132
133 //SvL: Wine code doesn't work for OS/2 1.3 bitmaps
134 if (bmi->bmiHeader.biSize == sizeof(BITMAPINFOHEADER))
135 {
136 if (bmi->bmiHeader.biBitCount > 8) return;
137 colors = bmi->bmiHeader.biClrUsed;
138 bitcount = bmi->bmiHeader.biBitCount;
139 colorptr = (char*)bmi->bmiColors;
140 incr = 4;
141 }
142 else
143 if (bmi->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
144 {
145 BITMAPCOREHEADER *core = (BITMAPCOREHEADER *)bmi;
146
147 if (core->bcBitCount > 8) return;
148 colors = (1 << core->bcBitCount);
149 bitcount = core->bcBitCount;
150 colorptr = (char*)(core + 1);
151 incr = 3;
152 }
153 else
154 {
155 dprintf(("Wrong bitmap header size!\n"));
156 return;
157 }
158
159 if (!colors && (bitcount <= 8))
160 colors = 1 << bitcount;
161
162 c_W = GetSysColor(COLOR_WINDOW);
163 c_S = GetSysColor(COLOR_3DSHADOW);
164 c_F = GetSysColor(COLOR_3DFACE);
165 c_L = GetSysColor(COLOR_3DLIGHT);
166 if (loadflags & LR_LOADTRANSPARENT) {
167 switch (bitcount) {
168 case 1: pix = pix >> 7; break;
169 case 4: pix = pix >> 4; break;
170 case 8: break;
171 default:
172 dprintf(("(%d): Unsupported depth\n", bitcount));
173 return;
174 }
175 if (pix >= colors) {
176 dprintf(("pixel has color index greater than biClrUsed!\n"));
177 return;
178 }
179 if (loadflags & LR_LOADMAP3DCOLORS) c_W = c_F;
180 ptr = (RGBQUAD*)((char*)colorptr+pix*incr);
181
182 ptr->rgbBlue = GetBValue(c_W);
183 ptr->rgbGreen = GetGValue(c_W);
184 ptr->rgbRed = GetRValue(c_W);
185 }
186 if (loadflags & LR_LOADMAP3DCOLORS) {
187 for (i=0; i<colors; i++) {
188 ptr = (RGBQUAD*)(colorptr +i*incr);
189 c_C = RGB(ptr->rgbRed, ptr->rgbGreen, ptr->rgbBlue);
190 if (c_C == RGB(128, 128, 128)) {
191 ptr->rgbRed = GetRValue(c_S);
192 ptr->rgbGreen = GetGValue(c_S);
193 ptr->rgbBlue = GetBValue(c_S);
194 } else if (c_C == RGB(192, 192, 192)) {
195 ptr->rgbRed = GetRValue(c_F);
196 ptr->rgbGreen = GetGValue(c_F);
197 ptr->rgbBlue = GetBValue(c_F);
198 } else if (c_C == RGB(223, 223, 223)) {
199 ptr->rgbRed = GetRValue(c_L);
200 ptr->rgbGreen = GetGValue(c_L);
201 ptr->rgbBlue = GetBValue(c_L);
202 }
203 }
204 }
205
206}
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