Mercurial > sdl-ios-xcode
annotate src/video/Xext/XmuStdCmap/AllCmap.c @ 3333:b334b4f7dfa0
[SDL] Bad math in SDL_RenderCopy
Mason Wheeler to sdl
When I tried to render an image using something other than NULL for srcrect, it got horribly distorted. I traced it down to the fact that the math in the rectangle adjustments performed just before the call to renderer->RenderCopy is written inside out. It should look like this:
if (dstrect->w != real_dstrect.w) {
int deltax = (dstrect->x - real_dstrect.x);
int deltaw = (dstrect->w - real_dstrect.w);
real_srcrect.x += (deltax * real_srcrect.w) / dstrect->w;
real_srcrect.w += (deltaw * real_srcrect.w) / dstrect->w;
}
if (dstrect->h != real_dstrect.h) {
int deltay = (dstrect->y - real_dstrect.y);
int deltah = (dstrect->h - real_dstrect.h);
real_srcrect.y += (deltay * real_srcrect.h) / dstrect->h;
real_srcrect.h += (deltah * real_srcrect.h) / dstrect->h;
author | Sam Lantinga <slouken@libsdl.org> |
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date | Sat, 03 Oct 2009 16:23:16 +0000 |
parents | 2032348afed1 |
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rev | line source |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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1 /* $Xorg: AllCmap.c,v 1.4 2001/02/09 02:03:51 xorgcvs Exp $ */ |
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2 |
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3 /* |
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4 |
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5 Copyright 1989, 1998 The Open Group |
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6 |
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7 Permission to use, copy, modify, distribute, and sell this software and its |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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8 documentation for any purpose is hereby granted without fee, provided that |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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9 the above copyright notice appear in all copies and that both that |
2032348afed1
This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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10 copyright notice and this permission notice appear in supporting |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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11 documentation. |
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12 |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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13 The above copyright notice and this permission notice shall be included in |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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14 all copies or substantial portions of the Software. |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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15 |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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17 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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18 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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19 OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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20 AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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21 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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22 |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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23 Except as contained in this notice, the name of The Open Group shall not be |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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24 used in advertising or otherwise to promote the sale, use or other dealings |
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25 in this Software without prior written authorization from The Open Group. |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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26 |
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27 */ |
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28 /* $XFree86: xc/lib/Xmu/AllCmap.c,v 1.7 2001/01/17 19:42:53 dawes Exp $ */ |
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29 |
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30 #ifdef HAVE_CONFIG_H |
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31 #include <config.h> |
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32 #endif |
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33 #include <stdio.h> |
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34 #include <X11/Xlib.h> |
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35 #include <X11/Xatom.h> |
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36 #include <X11/Xutil.h> |
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37 #include "../extensions/StdCmap.h" |
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38 |
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39 static XVisualInfo *getDeepestVisual(int, XVisualInfo *, int); |
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40 |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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41 /* |
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42 * To create all of the appropriate standard colormaps for every visual of |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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43 * every screen on a given display, use XmuAllStandardColormaps. |
2032348afed1
This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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44 * |
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45 * Define and retain as permanent resources all standard colormaps which are |
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This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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46 * meaningful for the visuals of each screen of the display. Return 0 on |
2032348afed1
This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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47 * failure, non-zero on success. If the property of any standard colormap |
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48 * is already defined, redefine it. |
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49 * |
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50 * This interface is intended to be used by window managers or a client |
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51 * upon start-up of a session. |
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52 * |
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53 * The standard colormaps of a screen are defined by properties associated |
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54 * with the screen's root window. Each screen has exactly one root window. |
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55 * The property names of standard colormaps are predefined, and each property |
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56 * name may describe at most one colormap. |
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57 * |
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58 * The standard colormaps are |
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59 * RGB_BEST_MAP |
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60 * RGB_RED_MAP |
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61 * RGB_GREEN_MAP |
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62 * RGB_BLUE_MAP |
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63 * RGB_DEFAULT_MAP |
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64 * RGB_GRAY_MAP |
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65 * |
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66 * Therefore a screen may have at most 6 standard colormap properties defined. |
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67 * |
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68 * A standard colormap is associated with a particular visual of the screen. |
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69 * A screen may have multiple visuals defined, including visuals of the same |
2032348afed1
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70 * class at different depths. Note that a visual id might be repeated for |
2032348afed1
This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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71 * more than one depth, so the visual id and the depth of a visual identify |
2032348afed1
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72 * the visual. The characteristics of the visual will determine which |
2032348afed1
This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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parents:
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73 * standard colormaps are meaningful under that visual, and will determine |
2032348afed1
This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
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74 * how the standard colormap is defined. Because a standard colormap is |
2032348afed1
This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
Bob Pendleton <bob@pendleton.com>
parents:
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75 * associated with a specific visual, there must be a method of determining |
2032348afed1
This code adds support for DirectColor visuals to SDL 1.3. The support uses part of the Xmu library. To ensure that the library is
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76 * which visuals take precedence in defining standard colormaps. |
2032348afed1
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77 * |
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78 * The method used here is: for the visual of greatest depth, define all |
2032348afed1
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79 * standard colormaps meaningful to that visual class, according to this |
2032348afed1
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80 * order of (descending) precedence: |
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81 * 1. DirectColor |
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82 * 2. PseudoColor |
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83 * 3. TrueColor and GrayScale |
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84 * 4. StaticColor and StaticGray |
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85 * |
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86 * Allows partial success by screenful. For example, if a map on screen 1 |
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87 * fails, the maps on screen 0, created earlier, will remain. However, |
2032348afed1
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88 * none on screen 1 will remain. If a map on 0 fails, none will remain. |
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89 * |
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90 * See the comments under XmuVisualStandardColormaps() for notes on which |
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91 * standard colormaps are meaningful under these classes of visuals. |
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92 */ |
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93 |
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94 Status |
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95 XmuAllStandardColormaps(Display * dpy) |
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96 { |
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97 int nvisuals, scr; |
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98 Status status; |
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99 long vinfo_mask; |
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100 XVisualInfo template, *vinfo, *v1, *v2; |
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101 |
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102 status = 0; |
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103 /* for each screen, determine all visuals of this server */ |
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104 for (scr = 0; scr < ScreenCount(dpy); scr++) { |
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105 template.screen = scr; |
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106 vinfo_mask = VisualScreenMask; |
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107 vinfo = XGetVisualInfo(dpy, vinfo_mask, &template, &nvisuals); |
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108 if (vinfo == NULL) /* unexpected: a screen with no visuals */ |
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109 continue; |
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110 |
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111 v1 = getDeepestVisual(DirectColor, vinfo, nvisuals); |
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112 v2 = getDeepestVisual(PseudoColor, vinfo, nvisuals); |
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113 |
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114 if (v2 && |
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115 (!v1 || (v2->colormap_size >= |
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116 ((v1->red_mask | v1->green_mask | v1->blue_mask) + 1)))) |
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117 status = XmuVisualStandardColormaps(dpy, scr, v2->visualid, |
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118 (unsigned) v2->depth, 1, 1); |
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119 else if (v1) |
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120 status = XmuVisualStandardColormaps(dpy, scr, v1->visualid, |
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121 (unsigned) v1->depth, 1, 1); |
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122 |
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123 else { |
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124 if (((v1 = getDeepestVisual(TrueColor, vinfo, nvisuals)) != NULL) |
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125 || ((v1 = getDeepestVisual(StaticColor, vinfo, nvisuals)) != |
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126 NULL)) |
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127 status = XmuVisualStandardColormaps(dpy, scr, v1->visualid, |
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128 (unsigned) v1->depth, 1, |
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129 1); |
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130 if (status |
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131 && |
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132 (((v1 = getDeepestVisual(GrayScale, vinfo, nvisuals)) != NULL) |
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133 || ((v1 = getDeepestVisual(StaticGray, vinfo, nvisuals)) != |
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134 NULL))) |
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135 status = |
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136 XmuVisualStandardColormaps(dpy, scr, v1->visualid, |
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137 (unsigned) v1->depth, 1, 1); |
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138 } |
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139 XFree((char *) vinfo); |
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140 if (!status) |
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141 break; |
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142 } |
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143 return status; |
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144 } |
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145 |
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146 static XVisualInfo * |
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147 getDeepestVisual(int visual_class, XVisualInfo * vinfo, int nvisuals) |
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148 { |
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149 register int i; |
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150 register int maxdepth = 0; |
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151 XVisualInfo *v = NULL; |
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152 |
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153 for (i = 0; i < nvisuals; i++, vinfo++) |
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154 if (vinfo->class == visual_class && vinfo->depth > maxdepth) { |
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155 maxdepth = vinfo->depth; |
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156 v = vinfo; |
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157 } |
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158 return (v); |
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159 } |