3 * Video BIOS Extensions (Vesa) Driver
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6 #define VERSION 0x100
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10 #include <tpl_drv_video.h>
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11 #include <fs_devfs.h>
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12 #include <modules.h>
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16 // === CONSTANTS ===
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17 #define FLAG_LFB 0x1
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18 #define VESA_DEFAULT_FRAMEBUFFER (KERNEL_BASE|0xA0000)
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19 #define BLINKING_CURSOR 0
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21 # define VESA_CURSOR_PERIOD 1000
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24 // === PROTOTYPES ===
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25 int Vesa_Install(char **Arguments);
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26 Uint64 Vesa_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
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27 Uint64 Vesa_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);
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28 int Vesa_Ioctl(tVFS_Node *Node, int ID, void *Data);
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29 int Vesa_Int_SetMode(int Mode);
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30 int Vesa_Int_FindMode(tVideo_IOCtl_Mode *data);
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31 int Vesa_Int_ModeInfo(tVideo_IOCtl_Mode *data);
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32 void Vesa_FlipCursor(void *Arg);
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33 // --- 2D Acceleration Functions --
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34 void Vesa_2D_Fill(void *Ent, Uint16 X, Uint16 Y, Uint16 W, Uint16 H, Uint32 Colour);
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35 void Vesa_2D_Blit(void *Ent, Uint16 DstX, Uint16 DstY, Uint16 SrcX, Uint16 SrcY, Uint16 W, Uint16 H);
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38 MODULE_DEFINE(0, VERSION, Vesa, Vesa_Install, NULL, "PCI", "VM8086", NULL);
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39 tDevFS_Driver gVesa_DriverStruct = {
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43 .Write = Vesa_Write,
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47 tSpinlock glVesa_Lock;
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48 tVM8086 *gpVesa_BiosState;
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49 int giVesaDriverId = -1;
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50 // --- Video Modes ---
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51 int giVesaCurrentMode = 0;
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52 int giVesaCurrentFormat = VIDEO_BUFFMT_TEXT;
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53 tVesa_Mode *gVesa_Modes;
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54 tVesa_Mode *gpVesaCurMode;
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55 int giVesaModeCount = 0;
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56 // --- Framebuffer ---
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57 char *gpVesa_Framebuffer = (void*)VESA_DEFAULT_FRAMEBUFFER;
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58 int giVesaPageCount = 0; //!< Framebuffer size in pages
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59 // --- Cursor Control ---
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60 int giVesaCursorX = -1;
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61 int giVesaCursorY = -1;
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62 int giVesaCursorTimer = -1; // Invalid timer
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63 // --- 2D Video Stream Handlers ---
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64 tDrvUtil_Video_2DHandlers gVesa_2DFunctions = {
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71 int Vesa_Install(char **Arguments)
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73 tVesa_CallInfo *info;
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75 tVesa_CallModeInfo *modeinfo;
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76 tFarPtr modeinfoPtr;
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80 // Allocate Info Block
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81 gpVesa_BiosState = VM8086_Init();
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82 info = VM8086_Allocate(gpVesa_BiosState, 512, &infoPtr.seg, &infoPtr.ofs);
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83 modeinfo = VM8086_Allocate(gpVesa_BiosState, 512, &modeinfoPtr.seg, &modeinfoPtr.ofs);
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84 // Set Requested Version
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85 memcpy(info->signature, "VBE2", 4);
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87 gpVesa_BiosState->AX = 0x4F00;
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88 gpVesa_BiosState->ES = infoPtr.seg; gpVesa_BiosState->DI = infoPtr.ofs;
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90 VM8086_Int(gpVesa_BiosState, 0x10);
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91 if(gpVesa_BiosState->AX != 0x004F) {
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92 Log_Warning("VESA", "Vesa_Install - VESA/VBE Unsupported (AX = 0x%x)", gpVesa_BiosState->AX);
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93 return MODULE_ERR_NOTNEEDED;
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96 Log_Debug("VESA", "info->VideoModes = %04x:%04x", info->VideoModes.seg, info->VideoModes.ofs);
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97 modes = (Uint16 *) VM8086_GetPointer(gpVesa_BiosState, info->VideoModes.seg, info->VideoModes.ofs);
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100 for( giVesaModeCount = 0; modes[giVesaModeCount] != 0xFFFF; giVesaModeCount++ );
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101 gVesa_Modes = (tVesa_Mode *)malloc( giVesaModeCount * sizeof(tVesa_Mode) );
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103 // Insert Text Mode
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104 gVesa_Modes[0].width = 80;
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105 gVesa_Modes[0].height = 25;
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106 gVesa_Modes[0].bpp = 12;
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107 gVesa_Modes[0].code = 0x3;
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108 gVesa_Modes[0].flags = 1;
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109 gVesa_Modes[0].fbSize = 80*25*2;
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110 gVesa_Modes[0].framebuffer = 0xB8000;
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112 for( i = 1; i < giVesaModeCount; i++ )
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114 gVesa_Modes[i].code = modes[i];
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116 gpVesa_BiosState->AX = 0x4F01;
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117 gpVesa_BiosState->CX = gVesa_Modes[i].code;
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118 gpVesa_BiosState->ES = modeinfoPtr.seg;
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119 gpVesa_BiosState->DI = modeinfoPtr.ofs;
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120 VM8086_Int(gpVesa_BiosState, 0x10);
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123 gVesa_Modes[i].flags = 0;
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124 if ( (modeinfo->attributes & 0x90) == 0x90 )
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126 gVesa_Modes[i].flags |= FLAG_LFB;
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127 gVesa_Modes[i].framebuffer = modeinfo->physbase;
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128 gVesa_Modes[i].fbSize = modeinfo->Xres*modeinfo->Yres*modeinfo->bpp/8;
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130 gVesa_Modes[i].framebuffer = 0;
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131 gVesa_Modes[i].fbSize = 0;
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134 gVesa_Modes[i].pitch = modeinfo->pitch;
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135 gVesa_Modes[i].width = modeinfo->Xres;
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136 gVesa_Modes[i].height = modeinfo->Yres;
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137 gVesa_Modes[i].bpp = modeinfo->bpp;
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140 Log_Log("VESA", "0x%x - %ix%ix%i",
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141 gVesa_Modes[i].code, gVesa_Modes[i].width, gVesa_Modes[i].height, gVesa_Modes[i].bpp);
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147 giVesaDriverId = DevFS_AddDevice( &gVesa_DriverStruct );
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148 if(giVesaDriverId == -1) return MODULE_ERR_MISC;
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150 return MODULE_ERR_OK;
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153 /* Read from the framebuffer
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155 Uint64 Vesa_Read(tVFS_Node *Node, Uint64 off, Uint64 len, void *buffer)
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158 Log("Vesa_Read: () - NULL\n");
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164 * \brief Write to the framebuffer
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166 Uint64 Vesa_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)
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168 ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);
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170 if(Buffer == NULL) {
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175 // Default Text mode
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176 if( giVesaCurrentMode == 0 )
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178 Uint16 *fb = (Uint16*)(KERNEL_BASE|0xB8000);
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179 tVT_Char *chars = Buffer;
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182 Length /= sizeof(tVT_Char);
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183 Offset /= sizeof(tVT_Char);
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185 if( giVesaCurrentFormat != VIDEO_BUFFMT_TEXT ) {
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186 Log_Warning("VESA", "Vesa_Write - Mode 0 is not framebuffer");
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191 if( Offset + Length > 25*80 ) {
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192 Log_Warning("VESA", "Vesa_Write - Framebuffer Overflow");
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198 LOG("fb = %p", fb);
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199 for(rem = Length; rem --; fb ++, chars++)
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201 if( chars->Ch < 0x80 )
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202 *fb = chars->Ch & 0x7F;
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206 *fb |= (chars->FGCol & 0x888) == 0x888 ? 0x8 : 0;
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207 *fb |= (chars->FGCol & 0x700) > 0x300 ? 0x4 : 0;
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208 *fb |= (chars->FGCol & 0x070) > 0x030 ? 0x2 : 0;
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209 *fb |= (chars->FGCol & 0x007) > 0x003 ? 0x1 : 0;
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210 *fb |= (chars->BGCol & 0x888) == 0x888 ? 0x80 : 0;
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211 *fb |= (chars->BGCol & 0x700) > 0x300 ? 0x40 : 0;
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212 *fb |= (chars->BGCol & 0x070) > 0x030 ? 0x20 : 0;
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213 *fb |= (chars->BGCol & 0x007) > 0x003 ? 0x10 : 0;
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214 //LOG("%08x (%03x,%03x) = %04x",
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215 // chars->Ch, chars->BGCol, chars->FGCol, *fb);
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217 Length *= sizeof(tVT_Char);
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218 LEAVE('X', Length);
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222 if( gVesa_Modes[giVesaCurrentMode].framebuffer == 0 ) {
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223 Log_Warning("VESA", "Vesa_Write - Non-LFB Modes not yet supported.");
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229 switch( giVesaCurrentFormat )
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231 case VIDEO_BUFFMT_TEXT:
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233 tVT_Char *chars = Buffer;
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234 int pitch = gVesa_Modes[giVesaCurrentMode].width;
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235 int widthInChars = gVesa_Modes[giVesaCurrentMode].width/giVT_CharWidth;
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236 int heightInChars = gVesa_Modes[giVesaCurrentMode].height/giVT_CharHeight;
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238 Uint32 *dest = (void*)gpVesa_Framebuffer;
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241 Length /= sizeof(tVT_Char);
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242 Offset /= sizeof(tVT_Char);
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244 LOG("gVesa_Modes[%i].width = %i", giVesaCurrentMode, gVesa_Modes[giVesaCurrentMode].width);
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245 x = Offset % widthInChars;
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246 y = Offset / widthInChars;
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247 LOG("(x,y) = (%i,%i) = [%i,%i]", x, y, x * giVT_CharWidth, y * giVT_CharHeight * pitch);
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248 LOG("(w,h) = (%i,%i) = [%i,%i]",
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249 (int)(Length % widthInChars),
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250 (int)(Length / widthInChars),
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251 (int)((Length % widthInChars) * giVT_CharWidth),
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252 (int)((Length / widthInChars) * giVT_CharHeight * pitch)
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256 if(y >= heightInChars) {
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261 if( Offset + Length > heightInChars*widthInChars ) {
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262 Log_Debug("VESA", "%i + %i > %i*%i (%i)",
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263 (int)Offset, (int)Length, heightInChars, widthInChars, heightInChars*widthInChars);
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264 Length = heightInChars*widthInChars - Offset;
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265 Log_Notice("VESA", "Clipping write size to %i characters", (int)Length);
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268 dest += y * giVT_CharHeight * pitch;
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269 dest += x * giVT_CharWidth;
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271 LOG("dest = %p", dest);
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273 for( i = 0; i < Length; i++ )
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277 dest + x*giVT_CharWidth, pitch,
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278 VT_Colour12to24(chars->BGCol),
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279 VT_Colour12to24(chars->FGCol)
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284 if( x >= widthInChars ) {
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287 dest += pitch*giVT_CharHeight;
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290 Length *= sizeof(tVT_Char);
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294 case VIDEO_BUFFMT_FRAMEBUFFER:
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296 Uint8 *destBuf = (Uint8*) ((Uint)gpVesa_Framebuffer + (Uint)Offset);
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298 if(gVesa_Modes[giVesaCurrentMode].fbSize < Offset+Length)
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300 Log_Warning("VESA", "Vesa_Write - Framebuffer Overflow");
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305 LOG("buffer = %p", Buffer);
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306 LOG("Updating Framebuffer (%p to %p)", destBuf, destBuf + (Uint)Length);
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309 // Copy to Frambuffer
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310 memcpy(destBuf, Buffer, Length);
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312 LOG("BGA Framebuffer updated");
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316 case VIDEO_BUFFMT_2DSTREAM:
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317 Length = DrvUtil_Video_2DStream(
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318 NULL, // Single framebuffer, so Ent is unused
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319 Buffer, Length, &gVesa_2DFunctions, sizeof(gVesa_2DFunctions)
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328 LEAVE('X', Length);
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333 * \fn int Vesa_Ioctl(vfs_node *node, int id, void *data)
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334 * \brief Handle messages to the device
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336 int Vesa_Ioctl(tVFS_Node *Node, int ID, void *Data)
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339 //Log_Debug("VESA", "Vesa_Ioctl: (Node=%p, ID=%i, Data=%p)", Node, ID, Data);
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342 case DRV_IOCTL_TYPE: return DRV_TYPE_VIDEO;
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343 case DRV_IOCTL_IDENT: memcpy("VESA", Data, 4); return 1;
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344 case DRV_IOCTL_VERSION: return VERSION;
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346 case VIDEO_IOCTL_GETSETMODE:
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347 if( !Data ) return giVesaCurrentMode;
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348 return Vesa_Int_SetMode( *(int*)Data );
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350 case VIDEO_IOCTL_FINDMODE:
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351 return Vesa_Int_FindMode((tVideo_IOCtl_Mode*)Data);
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352 case VIDEO_IOCTL_MODEINFO:
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353 return Vesa_Int_ModeInfo((tVideo_IOCtl_Mode*)Data);
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355 case VIDEO_IOCTL_SETBUFFORMAT:
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356 ret = giVesaCurrentFormat;
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358 //Log_Log("VESA", "Buffer mode to %i", *(int*)Data);
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359 giVesaCurrentFormat = *(int*)Data;
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363 case VIDEO_IOCTL_SETCURSOR: // Set cursor position
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364 #if !BLINKING_CURSOR
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365 if(giVesaCursorX > 0 && giVesaCursorY)
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366 Vesa_FlipCursor(Node);
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368 giVesaCursorX = ((tVideo_IOCtl_Pos*)Data)->x;
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369 giVesaCursorY = ((tVideo_IOCtl_Pos*)Data)->y;
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370 //Log_Debug("VESA", "Cursor position (%i,%i)", giVesaCursorX, giVesaCursorY);
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372 giVesaCursorX < 0 || giVesaCursorY < 0
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373 || giVesaCursorX >= gpVesaCurMode->width/giVT_CharWidth
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374 || giVesaCursorY >= gpVesaCurMode->height/giVT_CharHeight)
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376 #if BLINKING_CURSOR
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377 if(giVesaCursorTimer != -1) {
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378 Time_RemoveTimer(giVesaCursorTimer);
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379 giVesaCursorTimer = -1;
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382 giVesaCursorX = -1;
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383 giVesaCursorY = -1;
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386 #if BLINKING_CURSOR
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387 // Log_Debug("VESA", "Updating timer %i?", giVesaCursorTimer);
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388 if(giVesaCursorTimer == -1)
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389 giVesaCursorTimer = Time_CreateTimer(VESA_CURSOR_PERIOD, Vesa_FlipCursor, Node);
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391 Vesa_FlipCursor(Node);
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394 //Log_Debug("VESA", "Cursor position (%i,%i) Timer %i", giVesaCursorX, giVesaCursorY, giVesaCursorTimer);
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397 case VIDEO_IOCTL_REQLFB: // Request Linear Framebuffer
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404 * \brief Updates the video mode
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406 int Vesa_Int_SetMode(int mode)
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408 Log_Log("VESA", "Setting mode to %i", mode);
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410 // Sanity Check values
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411 if(mode < 0 || mode > giVesaModeCount) return -1;
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413 // Check for fast return
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414 if(mode == giVesaCurrentMode) return 1;
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416 Time_RemoveTimer(giVesaCursorTimer);
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417 giVesaCursorTimer = -1;
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419 LOCK( &glVesa_Lock );
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421 gpVesa_BiosState->AX = 0x4F02;
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422 gpVesa_BiosState->BX = gVesa_Modes[mode].code;
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423 if(gVesa_Modes[mode].flags & FLAG_LFB) {
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424 Log_Log("VESA", "Using LFB");
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425 gpVesa_BiosState->BX |= 0x4000; // Bit 14 - Use LFB
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429 VM8086_Int(gpVesa_BiosState, 0x10);
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432 if( (tVAddr)gpVesa_Framebuffer != VESA_DEFAULT_FRAMEBUFFER )
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433 MM_UnmapHWPages((tVAddr)gpVesa_Framebuffer, giVesaPageCount);
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434 giVesaPageCount = (gVesa_Modes[mode].fbSize + 0xFFF) >> 12;
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435 gpVesa_Framebuffer = (void*)MM_MapHWPages(gVesa_Modes[mode].framebuffer, giVesaPageCount);
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437 Log_Log("VESA", "Framebuffer (Phys) = 0x%x", gVesa_Modes[mode].framebuffer);
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438 Log_Log("VESA", "Framebuffer (Virt) = 0x%x", gpVesa_Framebuffer);
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441 giVesaCurrentMode = mode;
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442 gpVesaCurMode = &gVesa_Modes[giVesaCurrentMode];
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444 RELEASE( &glVesa_Lock );
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449 int Vesa_Int_FindMode(tVideo_IOCtl_Mode *data)
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452 int best = -1, bestFactor = 1000;
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455 ENTER("idata->width idata->height idata->bpp", data->width, data->height, data->bpp);
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457 for(i=0;i<giVesaModeCount;i++)
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459 LOG("Mode %i (%ix%ix%i)", i, gVesa_Modes[i].width, gVesa_Modes[i].height, gVesa_Modes[i].bpp);
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461 if(gVesa_Modes[i].width == data->width
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462 && gVesa_Modes[i].height == data->height
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463 && gVesa_Modes[i].bpp == data->bpp)
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470 tmp = gVesa_Modes[i].width * gVesa_Modes[i].height * gVesa_Modes[i].bpp;
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471 tmp -= data->width * data->height * data->bpp;
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472 tmp = tmp < 0 ? -tmp : tmp;
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473 factor = tmp * 100 / (data->width * data->height * data->bpp);
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475 LOG("factor = %i", factor);
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477 if(factor < bestFactor)
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479 bestFactor = factor;
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484 data->width = gVesa_Modes[best].width;
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485 data->height = gVesa_Modes[best].height;
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486 data->bpp = gVesa_Modes[best].bpp;
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491 int Vesa_Int_ModeInfo(tVideo_IOCtl_Mode *data)
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493 if(data->id < 0 || data->id > giVesaModeCount) return -1;
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494 data->width = gVesa_Modes[data->id].width;
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495 data->height = gVesa_Modes[data->id].height;
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496 data->bpp = gVesa_Modes[data->id].bpp;
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501 * \brief Updates the state of the text cursor
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502 * \note Just does a bitwise not on the cursor region
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504 void Vesa_FlipCursor(void *Arg)
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506 int pitch = gpVesaCurMode->pitch/4;
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507 int x = giVesaCursorX*giVT_CharWidth;
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508 int y = giVesaCursorY*giVT_CharHeight;
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510 Uint32 *fb = (void*)gpVesa_Framebuffer;
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512 //Debug("Cursor flip");
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515 if(giVesaCursorX < 0 || giVesaCursorY < 0
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516 || y*pitch + x + giVT_CharHeight*pitch > gpVesaCurMode->fbSize/4) {
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517 Debug("Cursor OOB (%i,%i)", x, y);
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518 giVesaCursorTimer = -1;
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523 fb += (y+1)*pitch + x;
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524 for( i = 1; i < giVT_CharHeight-1; i++, fb += pitch )
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527 #if BLINKING_CURSOR
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528 giVesaCursorTimer = Time_CreateTimer(VESA_CURSOR_PERIOD, Vesa_FlipCursor, Arg);
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532 // ------------------------
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533 // --- 2D Accelleration ---
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534 // ------------------------
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535 void Vesa_2D_Fill(void *Ent, Uint16 X, Uint16 Y, Uint16 W, Uint16 H, Uint32 Colour)
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537 int pitch = gpVesaCurMode->pitch/4;
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538 Uint32 *buf = (Uint32*)gpVesa_Framebuffer + Y*pitch + X;
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540 memsetd(buf, Colour, W);
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545 void Vesa_2D_Blit(void *Ent, Uint16 DstX, Uint16 DstY, Uint16 SrcX, Uint16 SrcY, Uint16 W, Uint16 H)
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547 int scrnpitch = gVesa_Modes[giVesaCurrentMode].pitch;
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548 int dst = DstY*scrnpitch + DstX;
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549 int src = SrcY*scrnpitch + SrcX;
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552 //Log("Vesa_2D_Blit: (Ent=%p, DstX=%i, DstY=%i, SrcX=%i, SrcY=%i, W=%i, H=%i)",
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553 // Ent, DstX, DstY, SrcX, SrcY, W, H);
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555 if(SrcX + W > gVesa_Modes[giVesaCurrentMode].width)
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556 W = gVesa_Modes[giVesaCurrentMode].width - SrcX;
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557 if(DstX + W > gVesa_Modes[giVesaCurrentMode].width)
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558 W = gVesa_Modes[giVesaCurrentMode].width - DstX;
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559 if(SrcY + H > gVesa_Modes[giVesaCurrentMode].height)
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560 H = gVesa_Modes[giVesaCurrentMode].height - SrcY;
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561 if(DstY + H > gVesa_Modes[giVesaCurrentMode].height)
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562 H = gVesa_Modes[giVesaCurrentMode].height - DstY;
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564 //Debug("W = %i, H = %i", W, H);
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568 dst += H*scrnpitch;
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569 src += H*scrnpitch;
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574 for( tmp = W; tmp --; ) {
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575 *(Uint32*)(gpVesa_Framebuffer + dst + tmp) = *(Uint32*)(gpVesa_Framebuffer + src + tmp);
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580 // Normal copy is OK
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582 memcpy((void*)gpVesa_Framebuffer + dst, (void*)gpVesa_Framebuffer + src, W*sizeof(Uint32));
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