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annotate src/video/riscos/SDL_riscossprite.c @ 1643:51038e80ae59

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More general fix for bug #189 The clipping is done at a higher level, and the low level functions are passed clipped rectangles. Drivers which don't support source clipping have not been changed, so the image will be squished instead of clipped, but at least they will no longer crash when the destination rect was out of bounds.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 17 Apr 2006 06:47:23 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
rev   line source
630
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1 /*
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2 SDL - Simple DirectMedia Layer
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b8d311d90021 Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22 #include "SDL_config.h"
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23
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24 /*
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25 File added by Alan Buckley (alan_baa@hotmail.com) for RISC OS compatability
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26 27 March 2003
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27
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28 Implements Sprite plotting code for wimp display.window
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29 */
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30
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31 #include "kernel.h"
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32 #include "swis.h"
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33
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34 #include "SDL_stdinc.h"
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35 #include "SDL_riscosvideo.h"
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36
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37 extern void WIMP_ReadModeInfo(_THIS);
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38
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39 void WIMP_PaletteChanged(_THIS);
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40
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41
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42 /* Create sprite buffer for screen */
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43
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44 unsigned char *WIMP_CreateBuffer(int width, int height, int bpp)
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45 {
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46 int size;
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47 char sprite_name[12] = "display";
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48 unsigned char *buffer;
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49 _kernel_swi_regs regs;
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50 int bytesPerPixel;
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51 int bytesPerRow;
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52 int offsetToSpriteData = 60;
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53
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54 switch(bpp)
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55 {
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56 case 32: bytesPerPixel = 4; break;
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57 case 16: bytesPerPixel = 2; break;
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58 case 8:
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59 bytesPerPixel = 1;
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60 offsetToSpriteData += 2048; /* Add in size of palette */
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61 break;
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62 default:
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63 return NULL;
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64 break;
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65 }
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66
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67 bytesPerRow = bytesPerPixel * width;
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68
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69 if ((bytesPerRow & 3) != 0)
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70 {
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71 bytesPerRow += 4 - (bytesPerRow & 3);
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72 }
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73 size = bytesPerRow * height;
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74
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75 buffer = SDL_malloc( (size_t) size + offsetToSpriteData );
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76 if (!buffer) return NULL;
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77
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78 /* Initialise a sprite area */
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79
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80 *(unsigned int *)buffer = size + offsetToSpriteData;
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81 *(unsigned int *)(buffer + 8) = 16;
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82
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83 regs.r[0] = 256+9;
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84 regs.r[1] = (unsigned int)buffer;
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85 _kernel_swi(OS_SpriteOp, &regs, &regs);
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86
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87 regs.r[0] = 256+15;
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88 regs.r[1] = (unsigned int)buffer;
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89 regs.r[2] = (unsigned int)&sprite_name;
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90 regs.r[3] = 0; /* Palette flag: 0 = no palette */
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91 regs.r[4] = width;
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92 regs.r[5] = height;
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93 if (bpp == 8)
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94 {
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95 /* Use old style mode number */
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96 regs.r[6] = 28; /* 8bpp 90x90dpi */
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97 } else
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98 {
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99 regs.r[6] = (((bpp == 16) ? 5 : 6) << 27) /* Type 6 = 32bpp sprite, 5 = 16bpp sprite */
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100 | (90 << 14) /* Vertical dpi */
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101 | (90 << 1) /* Horizontal dpi */
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102 | 1; /* Marker to distinguish between mode selectors and sprite modes */
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103 }
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104 if (_kernel_swi(OS_SpriteOp, &regs, &regs) == NULL)
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105 {
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106 if (bpp == 8)
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107 {
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108 /* Modify sprite to take into account 256 colour palette */
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109 int *sprite = (int *)(buffer + 16);
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110 /* Adjust sprite offsets */
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111 sprite[0] += 2048;
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112 sprite[8] += 2048;
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113 sprite[9] += 2048;
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114 /* Adjust sprite area next free pointer */
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115 (*(int *)(buffer+12)) += 2048;
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116
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117 /* Don't need to set up palette as SDL sets up the default
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118 256 colour palette */
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119 /* {
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120 int *pal = sprite + 11;
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121 unsigned int j;
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122 unsigned int entry;
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123 for (j = 0; j < 255; j++)
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124 {
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125 entry = (j << 24) | (j << 16) | (j << 8);
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126 *pal++ = entry;
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127 *pal++ = entry;
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128 }
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129 }
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130 */
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131 }
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132 } else
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133 {
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134 SDL_free(buffer);
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135 buffer = NULL;
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136 }
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137
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138 return buffer;
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139 }
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140
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141
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142 /* Setup translation buffers for the sprite plotting */
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Sam Lantinga <slouken@libsdl.org>
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143
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Sam Lantinga <slouken@libsdl.org>
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144 void WIMP_SetupPlotInfo(_THIS)
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Sam Lantinga <slouken@libsdl.org>
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145 {
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146 _kernel_swi_regs regs;
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147 int *sprite = ((int *)this->hidden->bank[1])+4;
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148
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149 regs.r[0] = (unsigned int)this->hidden->bank[1];
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150 regs.r[1] = (unsigned int)sprite;
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Sam Lantinga <slouken@libsdl.org>
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151 regs.r[2] = -1; /* Current mode */
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Sam Lantinga <slouken@libsdl.org>
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152 regs.r[3] = -1; /* Current palette */
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Sam Lantinga <slouken@libsdl.org>
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153 regs.r[4] = 0; /* Get size of buffer */
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154 regs.r[5] = 1|2|16; /* R1 - pointer to sprite and can use full palette words */
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155 regs.r[6] = 0;
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Sam Lantinga <slouken@libsdl.org>
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156 regs.r[7] = 0;
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157
1336
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158 if (this->hidden->pixtrans) SDL_free(this->hidden->pixtrans);
630
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159 this->hidden->pixtrans = 0;
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160
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diff changeset
161 /* Get the size required for the buffer */
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Sam Lantinga <slouken@libsdl.org>
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162 _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
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Sam Lantinga <slouken@libsdl.org>
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163 if (regs.r[4])
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164 {
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165 this->hidden->pixtrans = SDL_malloc(regs.r[4]);
630
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166
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167 regs.r[4] = (unsigned int)this->hidden->pixtrans;
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168 /* Actually read the buffer */
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169 _kernel_swi(ColourTrans_GenerateTable, &regs, &regs);
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170 }
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Sam Lantinga <slouken@libsdl.org>
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171 }
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Sam Lantinga <slouken@libsdl.org>
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172
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Sam Lantinga <slouken@libsdl.org>
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173 /* Plot the sprite in the given context */
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Sam Lantinga <slouken@libsdl.org>
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174 void WIMP_PlotSprite(_THIS, int x, int y)
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Sam Lantinga <slouken@libsdl.org>
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175 {
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176 _kernel_swi_regs regs;
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Sam Lantinga <slouken@libsdl.org>
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177 _kernel_oserror *err;
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178
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Sam Lantinga <slouken@libsdl.org>
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179 regs.r[0] = 52 + 512;
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180 regs.r[1] = (unsigned int)this->hidden->bank[1];
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181 regs.r[2] = (unsigned int)this->hidden->bank[1]+16;
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182 regs.r[3] = x;
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183 regs.r[4] = y;
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Sam Lantinga <slouken@libsdl.org>
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184 regs.r[5] = 0|32; /* Overwrite screen and pixtrans contains wide colour entries */
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185 regs.r[6] = 0; /* No scale factors i.e. 1:1 */
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parents:
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186 regs.r[7] = (int)this->hidden->pixtrans;
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187
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188 if ((err = _kernel_swi(OS_SpriteOp, &regs, &regs)) != 0)
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189 {
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190 int *p = (int *)this->hidden->pixtrans;
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Sam Lantinga <slouken@libsdl.org>
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191 printf("OS_SpriteOp failed \n%s\n",err->errmess);
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192 printf("pixtrans %d\n", (int)this->hidden->pixtrans);
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193 printf("%x %x %x\n", p[0], p[1], p[2]);
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194 }
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195 }
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196
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197
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Sam Lantinga <slouken@libsdl.org>
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198 /* Wimp mode has changes so update colour mapping and pixel sizes
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Sam Lantinga <slouken@libsdl.org>
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199 of windows and the sprites they plot */
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200
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Sam Lantinga <slouken@libsdl.org>
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201 void WIMP_ModeChanged(_THIS)
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202 {
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Sam Lantinga <slouken@libsdl.org>
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203 int oldXeig = this->hidden->xeig;
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204 int oldYeig = this->hidden->yeig;
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205
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206 WIMP_ReadModeInfo(this);
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207
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208 if (oldXeig == this->hidden->xeig && oldYeig == this->hidden->yeig)
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209 {
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210 /* Only need to update the palette */
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211 WIMP_PaletteChanged(this);
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212 } else
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213 {
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214 _kernel_swi_regs regs;
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215 int window_state[9];
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216 int extent[4];
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217 int currWidth, currHeight;
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218 int newWidth, newHeight;
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219
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220 /* Need to resize windows and update the palette */
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221 WIMP_SetupPlotInfo(this);
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diff changeset
222
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223
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Sam Lantinga <slouken@libsdl.org>
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224 window_state[0] = this->hidden->window_handle;
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225 regs.r[1] = (unsigned int)window_state;
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226 _kernel_swi(Wimp_GetWindowState, &regs, &regs);
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227
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
228 currWidth = window_state[3] - window_state[1];
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229 currHeight = window_state[4] - window_state[2];
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230
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diff changeset
231 newWidth = (currWidth >> oldXeig) << this->hidden->xeig;
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232 newHeight = (currHeight >> oldYeig) << this->hidden->yeig;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
233 /* Need to avoid extent getting too small for visible part
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
234 of window */
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Sam Lantinga <slouken@libsdl.org>
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235 extent[0] = 0;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
236 if (currHeight <= newHeight)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237 {
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238 extent[1] = -newHeight;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
239 } else
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
240 {
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
241 extent[1] = -currHeight;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
242 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 if (currWidth <= newWidth)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244 {
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diff changeset
245 extent[2] = newWidth;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
246 } else
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
247 {
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
248 extent[2] = currWidth;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
249 }
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
250 extent[3] = 0;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
251
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
252 regs.r[0] = this->hidden->window_handle;
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Sam Lantinga <slouken@libsdl.org>
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253 regs.r[1] = (int)extent;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 _kernel_swi(Wimp_SetExtent, &regs, &regs);
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255
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 /*TODO: May need to set flag to resize window on next open */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
257 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
258 }
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
259
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
260 /* Palette has changed so update palettes used for windows sprites */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
261
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
262 void WIMP_PaletteChanged(_THIS)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
263 {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
264 WIMP_SetupPlotInfo(this);
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
265 }