Modules/VESA - Changed to use DrvUtil functions
[tpg/acess2.git] / Modules / Display / VESA / main.c
index e960888..02689ea 100644 (file)
@@ -2,12 +2,12 @@
  * AcessOS 1\r
  * Video BIOS Extensions (Vesa) Driver\r
  */\r
-#define DEBUG  1\r
+#define DEBUG  0\r
 #define VERSION        0x100\r
 \r
 #include <acess.h>\r
 #include <vfs.h>\r
-#include <tpl_drv_video.h>\r
+#include <api_drv_video.h>\r
 #include <fs_devfs.h>\r
 #include <modules.h>\r
 #include <vm8086.h>\r
 \r
 // === CONSTANTS ===\r
 #define        FLAG_LFB        0x1\r
+#define VESA_DEFAULT_FRAMEBUFFER       (KERNEL_BASE|0xA0000)\r
+#define BLINKING_CURSOR        1\r
+#if BLINKING_CURSOR\r
+# define VESA_CURSOR_PERIOD    1000\r
+#endif\r
 \r
 // === PROTOTYPES ===\r
  int   Vesa_Install(char **Arguments);\r
 Uint64 Vesa_Read(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);\r
 Uint64 Vesa_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer);\r
- int   Vesa_Ioctl(tVFS_Node *Node, int ID, void *Data);\r
+ int   Vesa_IOCtl(tVFS_Node *Node, int ID, void *Data);\r
  int   Vesa_Int_SetMode(int Mode);\r
  int   Vesa_Int_FindMode(tVideo_IOCtl_Mode *data);\r
  int   Vesa_Int_ModeInfo(tVideo_IOCtl_Mode *data);\r
+void   Vesa_FlipCursor(void *Arg);\r
+// --- 2D Acceleration Functions --\r
+void   Vesa_2D_Fill(void *Ent, Uint16 X, Uint16 Y, Uint16 W, Uint16 H, Uint32 Colour);\r
+void   Vesa_2D_Blit(void *Ent, Uint16 DstX, Uint16 DstY, Uint16 SrcX, Uint16 SrcY, Uint16 W, Uint16 H);\r
 \r
 // === GLOBALS ===\r
 MODULE_DEFINE(0, VERSION, Vesa, Vesa_Install, NULL, "PCI", "VM8086", NULL);\r
@@ -32,19 +41,33 @@ tDevFS_Driver       gVesa_DriverStruct = {
        {\r
        .Read = Vesa_Read,\r
        .Write = Vesa_Write,\r
-       .IOCtl = Vesa_Ioctl\r
+       .IOCtl = Vesa_IOCtl\r
        }\r
 };\r
-tSpinlock      glVesa_Lock;\r
+tMutex glVesa_Lock;\r
 tVM8086        *gpVesa_BiosState;\r
- int   giVesaCurrentMode = -1;\r
  int   giVesaDriverId = -1;\r
-char   *gVesaFramebuffer = (void*)0xC00A0000;\r
+// --- Video Modes ---\r
+ int   giVesaCurrentMode = 0;\r
 tVesa_Mode     *gVesa_Modes;\r
+tVesa_Mode     *gpVesaCurMode;\r
  int   giVesaModeCount = 0;\r
- int   giVesaPageCount = 0;\r
+// --- Framebuffer ---\r
+char   *gpVesa_Framebuffer = (void*)VESA_DEFAULT_FRAMEBUFFER;\r
+ int   giVesaPageCount = 0;    //!< Framebuffer size in pages\r
+// --- Cursor Control ---\r
+ int   giVesaCursorX = -1;\r
+ int   giVesaCursorY = -1;\r
+ int   giVesaCursorTimer = -1; // Invalid timer\r
+// --- 2D Video Stream Handlers ---\r
+tDrvUtil_Video_2DHandlers      gVesa_2DFunctions = {\r
+       NULL,\r
+       Vesa_2D_Fill,\r
+       Vesa_2D_Blit\r
+};\r
+tDrvUtil_Video_BufInfo gVesa_BufInfo;\r
 \r
-//CODE\r
+// === CODE ===\r
 int Vesa_Install(char **Arguments)\r
 {\r
        tVesa_CallInfo  *info;\r
@@ -66,22 +89,25 @@ int Vesa_Install(char **Arguments)
        // Call Interrupt\r
        VM8086_Int(gpVesa_BiosState, 0x10);\r
        if(gpVesa_BiosState->AX != 0x004F) {\r
-               Log_Warning("Vesa", "Vesa_Install - VESA/VBE Unsupported (AX = 0x%x)\n", gpVesa_BiosState->AX);\r
+               Log_Warning("VESA", "Vesa_Install - VESA/VBE Unsupported (AX = 0x%x)", gpVesa_BiosState->AX);\r
                return MODULE_ERR_NOTNEEDED;\r
        }\r
        \r
+       //Log_Debug("VESA", "info->VideoModes = %04x:%04x", info->VideoModes.seg, info->VideoModes.ofs);\r
        modes = (Uint16 *) VM8086_GetPointer(gpVesa_BiosState, info->VideoModes.seg, info->VideoModes.ofs);\r
        \r
        // Read Modes\r
-       for( giVesaModeCount = 1; modes[giVesaModeCount] != 0xFFFF; giVesaModeCount++ );\r
+       for( giVesaModeCount = 0; modes[giVesaModeCount] != 0xFFFF; giVesaModeCount++ );\r
        gVesa_Modes = (tVesa_Mode *)malloc( giVesaModeCount * sizeof(tVesa_Mode) );\r
        \r
+       Log_Debug("VESA", "%i Modes", giVesaModeCount);\r
+       \r
        // Insert Text Mode\r
        gVesa_Modes[0].width = 80;\r
        gVesa_Modes[0].height = 25;\r
        gVesa_Modes[0].bpp = 12;\r
        gVesa_Modes[0].code = 0x3;\r
-       gVesa_Modes[0].flags = VIDEO_FLAG_TEXT;\r
+       gVesa_Modes[0].flags = 1;\r
        gVesa_Modes[0].fbSize = 80*25*2;\r
        gVesa_Modes[0].framebuffer = 0xB8000;\r
        \r
@@ -95,26 +121,25 @@ int Vesa_Install(char **Arguments)
                gpVesa_BiosState->DI = modeinfoPtr.ofs;\r
                VM8086_Int(gpVesa_BiosState, 0x10);\r
                \r
-               Log_Debug("Vesa", "gpVesa_BiosState->AX = 0x%04x", gpVesa_BiosState->AX);\r
-               \r
                // Parse Info\r
                gVesa_Modes[i].flags = 0;\r
                if ( (modeinfo->attributes & 0x90) == 0x90 )\r
                {\r
                        gVesa_Modes[i].flags |= FLAG_LFB;\r
                        gVesa_Modes[i].framebuffer = modeinfo->physbase;\r
-                       gVesa_Modes[i].fbSize = modeinfo->Xres*modeinfo->Yres*modeinfo->bpp/8;\r
+                       gVesa_Modes[i].fbSize = modeinfo->Yres*modeinfo->pitch;\r
                } else {\r
                        gVesa_Modes[i].framebuffer = 0;\r
                        gVesa_Modes[i].fbSize = 0;\r
                }\r
                \r
+               gVesa_Modes[i].pitch = modeinfo->pitch;\r
                gVesa_Modes[i].width = modeinfo->Xres;\r
                gVesa_Modes[i].height = modeinfo->Yres;\r
                gVesa_Modes[i].bpp = modeinfo->bpp;\r
                \r
                #if DEBUG\r
-               Log_Log("Vesa", "0x%x - %ix%ix%i",\r
+               Log_Log("VESA", "0x%x - %ix%ix%i",\r
                        gVesa_Modes[i].code, gVesa_Modes[i].width, gVesa_Modes[i].height, gVesa_Modes[i].bpp);\r
                #endif\r
        }\r
@@ -132,7 +157,7 @@ int Vesa_Install(char **Arguments)
 Uint64 Vesa_Read(tVFS_Node *Node, Uint64 off, Uint64 len, void *buffer)\r
 {\r
        #if DEBUG >= 2\r
-       LogF("Vesa_Read: () - NULL\n");\r
+       Log("Vesa_Read: () - NULL\n");\r
        #endif\r
        return 0;\r
 }\r
@@ -142,76 +167,26 @@ Uint64 Vesa_Read(tVFS_Node *Node, Uint64 off, Uint64 len, void *buffer)
  */\r
 Uint64 Vesa_Write(tVFS_Node *Node, Uint64 Offset, Uint64 Length, void *Buffer)\r
 {\r
-       ENTER("pNode XOffset XLength pBuffer", Node, Offset, Length, Buffer);\r
-\r
-       if(Buffer == NULL) {\r
-               LEAVE('i', 0);\r
-               return 0;\r
-       }\r
-\r
-       // Default Text mode\r
-       if( giVesaCurrentMode == 0 )\r
-       {\r
-               Uint8   *fb = (Uint8 *)(KERNEL_BASE|0xB8000);\r
-               Uint32  *buf = Buffer;\r
-               if( Offset + Length > 25*80*8 ) {\r
-                       Log_Warning("VESA", "Vesa_Write - Framebuffer Overflow");\r
-                       LEAVE('i', 0);\r
-                       return 0;\r
-               }\r
-               \r
-               fb += 2*Offset;\r
-               for(; Length > 0; Length -= 8, fb += 2)\r
-               {\r
-                       if( *buf < 0x80 )\r
-                               *fb = *buf & 0x7F;\r
-                       else\r
-                               *fb = 0x00;\r
-                       buf ++;\r
-                       \r
-                       fb[1] = 0;\r
-                       fb[1] |= (*buf & 0x888) == 0x888 ? 0x8 : 0;\r
-                       fb[1] |= (*buf & 0x700) > 0x300 ? 0x4 : 0;\r
-                       fb[1] |= (*buf & 0x070) > 0x030 ? 0x2 : 0;\r
-                       fb[1] |= (*buf & 0x007) > 0x003 ? 0x1 : 0;\r
-                       fb[1] |= (*buf & 0x888000) == 0x888000 ? 0x80 : 0;\r
-                       fb[1] |= (*buf & 0x700000) > 0x300000 ? 0x40 : 0;\r
-                       fb[1] |= (*buf & 0x070000) > 0x030000 ? 0x20 : 0;\r
-                       fb[1] |= (*buf & 0x007000) > 0x003000 ? 0x10 : 0;\r
-                       buf ++;\r
-               }\r
-       }\r
-\r
        if( gVesa_Modes[giVesaCurrentMode].framebuffer == 0 ) {\r
                Log_Warning("VESA", "Vesa_Write - Non-LFB Modes not yet supported.");\r
-               LEAVE('i', 0);\r
-               return 0;\r
-       }\r
-       if(gVesa_Modes[giVesaCurrentMode].fbSize < Offset+Length)\r
-       {\r
-               Log_Warning("VESA", "Vesa_Write - Framebuffer Overflow");\r
-               LEAVE('i', 0);\r
                return 0;\r
        }\r
-       \r
-       memcpy(gVesaFramebuffer + Offset, Buffer, Length);\r
-       \r
-       LEAVE('X', Length);\r
-       return Length;\r
+\r
+       return DrvUtil_Video_WriteLFB(&gVesa_BufInfo, Offset, Length, Buffer);\r
 }\r
 \r
+const char *csaVESA_IOCtls[] = {DRV_IOCTLNAMES, DRV_VIDEO_IOCTLNAMES, NULL};\r
 /**\r
- * \fn int Vesa_Ioctl(vfs_node *node, int id, void *data)\r
  * \brief Handle messages to the device\r
  */\r
-int Vesa_Ioctl(tVFS_Node *Node, int ID, void *Data)\r
+int Vesa_IOCtl(tVFS_Node *Node, int ID, void *Data)\r
 {\r
+        int    ret;\r
+       //Log_Debug("VESA", "Vesa_Ioctl: (Node=%p, ID=%i, Data=%p)", Node, ID, Data);\r
        switch(ID)\r
        {\r
-       case DRV_IOCTL_TYPE:    return DRV_TYPE_VIDEO;\r
-       case DRV_IOCTL_IDENT:   memcpy("VESA", Data, 4);        return 1;\r
-       case DRV_IOCTL_VERSION: return VERSION;\r
-       \r
+       BASE_IOCTLS(DRV_TYPE_VIDEO, "VESA", VERSION, csaVESA_IOCtls);\r
+\r
        case VIDEO_IOCTL_GETSETMODE:\r
                if( !Data )     return giVesaCurrentMode;\r
                return Vesa_Int_SetMode( *(int*)Data );\r
@@ -221,25 +196,69 @@ int Vesa_Ioctl(tVFS_Node *Node, int ID, void *Data)
        case VIDEO_IOCTL_MODEINFO:\r
                return Vesa_Int_ModeInfo((tVideo_IOCtl_Mode*)Data);\r
        \r
-       case VIDEO_IOCTL_REQLFB:        // Request Linear Framebuffer\r
+       case VIDEO_IOCTL_SETBUFFORMAT:\r
+               ret = gVesa_BufInfo.BufferFormat;\r
+               if(Data)        gVesa_BufInfo.BufferFormat = *(int*)Data;\r
+               return ret;\r
+       \r
+       case VIDEO_IOCTL_SETCURSOR:     // Set cursor position\r
+               #if !BLINKING_CURSOR\r
+               if(giVesaCursorX >= 0)\r
+                       Vesa_FlipCursor(Node);\r
+               #endif\r
+               giVesaCursorX = ((tVideo_IOCtl_Pos*)Data)->x;\r
+               giVesaCursorY = ((tVideo_IOCtl_Pos*)Data)->y;\r
+               //Log_Debug("VESA", "Cursor position (%i,%i)", giVesaCursorX, giVesaCursorY);\r
+               if(\r
+                       giVesaCursorX < 0 || giVesaCursorY < 0\r
+               ||      giVesaCursorX >= gpVesaCurMode->width/giVT_CharWidth\r
+               ||      giVesaCursorY >= gpVesaCurMode->height/giVT_CharHeight)\r
+               {\r
+                       #if BLINKING_CURSOR\r
+                       if(giVesaCursorTimer != -1) {\r
+                               Time_RemoveTimer(giVesaCursorTimer);\r
+                               giVesaCursorTimer = -1;\r
+                       }\r
+                       #endif\r
+                       giVesaCursorX = -1;\r
+                       giVesaCursorY = -1;\r
+               }\r
+               else {\r
+                       #if BLINKING_CURSOR\r
+               //      Log_Debug("VESA", "Updating timer %i?", giVesaCursorTimer);\r
+                       if(giVesaCursorTimer == -1)\r
+                               giVesaCursorTimer = Time_CreateTimer(VESA_CURSOR_PERIOD, Vesa_FlipCursor, Node);\r
+                       #else\r
+                       Vesa_FlipCursor(Node);\r
+                       #endif\r
+               }\r
+               //Log_Debug("VESA", "Cursor position (%i,%i) Timer %i", giVesaCursorX, giVesaCursorY, giVesaCursorTimer);\r
                return 0;\r
        }\r
        return 0;\r
 }\r
 \r
+/**\r
+ * \brief Updates the video mode\r
+ */\r
 int Vesa_Int_SetMode(int mode)\r
 {      \r
-       #if DEBUG\r
-       LogF("Vesa_Int_SetMode: (mode=%i)\n", mode);\r
-       #endif\r
-       \r
        // Sanity Check values\r
        if(mode < 0 || mode > giVesaModeCount)  return -1;\r
+\r
+       Log_Log("VESA", "Setting mode to %i (%ix%i %ibpp)",\r
+               mode,\r
+               gVesa_Modes[mode].width, gVesa_Modes[mode].height,\r
+               gVesa_Modes[mode].bpp\r
+               );\r
        \r
        // Check for fast return\r
        if(mode == giVesaCurrentMode)   return 1;\r
        \r
-       LOCK( &glVesa_Lock );\r
+       Time_RemoveTimer(giVesaCursorTimer);\r
+       giVesaCursorTimer = -1;\r
+       \r
+       Mutex_Acquire( &glVesa_Lock );\r
        \r
        gpVesa_BiosState->AX = 0x4F02;\r
        gpVesa_BiosState->BX = gVesa_Modes[mode].code;\r
@@ -252,18 +271,26 @@ int Vesa_Int_SetMode(int mode)
        VM8086_Int(gpVesa_BiosState, 0x10);\r
        \r
        // Map Framebuffer\r
-       MM_UnmapHWPages((tVAddr)gVesaFramebuffer, giVesaPageCount);\r
+       if( (tVAddr)gpVesa_Framebuffer != VESA_DEFAULT_FRAMEBUFFER )\r
+               MM_UnmapHWPages((tVAddr)gpVesa_Framebuffer, giVesaPageCount);\r
        giVesaPageCount = (gVesa_Modes[mode].fbSize + 0xFFF) >> 12;\r
-       gVesaFramebuffer = (void*)MM_MapHWPages(gVesa_Modes[mode].framebuffer, giVesaPageCount);\r
+       gpVesa_Framebuffer = (void*)MM_MapHWPages(gVesa_Modes[mode].framebuffer, giVesaPageCount);\r
        \r
-       LogF("Vesa", "Framebuffer (Phys) = 0x%x", gVesa_Modes[mode].framebuffer);\r
-       LogF("Vesa", "Framebuffer (Virt) = 0x%x", gVesaFramebuffer);\r
+       Log_Log("VESA", "Framebuffer (Phys) = 0x%x, (Virt) = 0x%x, Size = 0x%x",\r
+               gVesa_Modes[mode].framebuffer, gpVesa_Framebuffer, giVesaPageCount << 12);\r
        \r
        // Record Mode Set\r
        giVesaCurrentMode = mode;\r
+       gpVesaCurMode = &gVesa_Modes[giVesaCurrentMode];\r
        \r
-       RELEASE( &glVesa_Lock );\r
-       \r
+       Mutex_Release( &glVesa_Lock );\r
+\r
+       gVesa_BufInfo.Framebuffer = gpVesa_Framebuffer;\r
+       gVesa_BufInfo.Pitch = gVesa_Modes[mode].pitch;\r
+       gVesa_BufInfo.Width = gVesa_Modes[mode].width;\r
+       gVesa_BufInfo.Height = gVesa_Modes[mode].height;\r
+       gVesa_BufInfo.Depth = gVesa_Modes[mode].bpp;    \r
+\r
        return 1;\r
 }\r
 \r
@@ -275,28 +302,40 @@ int Vesa_Int_FindMode(tVideo_IOCtl_Mode *data)
        \r
        ENTER("idata->width idata->height idata->bpp", data->width, data->height, data->bpp);\r
        \r
-       if(data->flags & VIDEO_FLAG_TEXT) {\r
-               LEAVE('i', 0);\r
-               return 0;\r
-       }\r
-       \r
        for(i=0;i<giVesaModeCount;i++)\r
        {\r
                LOG("Mode %i (%ix%ix%i)", i, gVesa_Modes[i].width, gVesa_Modes[i].height, gVesa_Modes[i].bpp);\r
        \r
-               if(gVesa_Modes[i].width == data->width\r
-               && gVesa_Modes[i].height == data->height\r
-               && gVesa_Modes[i].bpp == data->bpp)\r
+               if(gVesa_Modes[i].width == data->width && gVesa_Modes[i].height == data->height)\r
                {\r
-                       LOG("Perfect!");\r
-                       best = i;\r
-                       break;\r
+                       //if( (data->bpp == 32 || data->bpp == 24)\r
+                       // && (gVesa_Modes[i].bpp == 32 || gVesa_Modes[i].bpp == 24) )\r
+                       if( data->bpp == gVesa_Modes[i].bpp )\r
+                       {\r
+                               LOG("Perfect!");\r
+                               best = i;\r
+                               break;\r
+                       }\r
                }\r
                \r
-               tmp = gVesa_Modes[i].width * gVesa_Modes[i].height * gVesa_Modes[i].bpp;\r
-               tmp -= data->width * data->height * data->bpp;\r
+               tmp = gVesa_Modes[i].width * gVesa_Modes[i].height;\r
+               tmp -= data->width * data->height;\r
                tmp = tmp < 0 ? -tmp : tmp;\r
-               factor = tmp * 100 / (data->width * data->height * data->bpp);\r
+               factor = tmp * 1000 / (data->width * data->height);\r
+               \r
+               if( data->bpp == 8 && gVesa_Modes[i].bpp != 8 ) continue;\r
+               if( data->bpp == 16 && gVesa_Modes[i].bpp != 16 )       continue;\r
+               \r
+               if( (data->bpp == 32 || data->bpp == 24)\r
+                && (gVesa_Modes[i].bpp == 32 || gVesa_Modes[i].bpp == 24) )\r
+               {\r
+                       if( data->bpp == gVesa_Modes[i].bpp )\r
+                               factor /= 2;\r
+               }\r
+               else {\r
+                       if( data->bpp != gVesa_Modes[i].bpp )\r
+                               continue ;\r
+               }\r
                \r
                LOG("factor = %i", factor);\r
                \r
@@ -322,3 +361,127 @@ int Vesa_Int_ModeInfo(tVideo_IOCtl_Mode *data)
        data->bpp = gVesa_Modes[data->id].bpp;\r
        return 1;\r
 }\r
+\r
+/**\r
+ * \brief Updates the state of the text cursor\r
+ * \note Just does a bitwise not on the cursor region\r
+ */\r
+void Vesa_FlipCursor(void *Arg)\r
+{\r
+        int    pitch = gpVesaCurMode->pitch;\r
+        int    bytes_per_px = (gpVesaCurMode->bpp + 7) / 8;\r
+        int    x = giVesaCursorX*giVT_CharWidth;\r
+        int    y = giVesaCursorY*giVT_CharHeight;\r
+        int    i;\r
+       Uint8   *fb = (void*)gpVesa_Framebuffer;\r
+       \r
+       //Debug("Cursor flip");\r
+       \r
+       // Sanity check\r
+       if(giVesaCursorX < 0 || giVesaCursorY < 0\r
+       || y*pitch + x + (giVT_CharHeight-1)*pitch > (int)gpVesaCurMode->fbSize) {\r
+               Log_Notice("VESA", "Cursor OOB (%i,%i)", x, y);\r
+               giVesaCursorTimer = -1;\r
+               return;\r
+       }\r
+       \r
+       // Draw cursor\r
+       fb += (y+1)*pitch + x*bytes_per_px;\r
+       \r
+       switch(bytes_per_px)\r
+       {\r
+       case 1:\r
+               for( i = 1; i < giVT_CharHeight-1; i++, fb += pitch )\r
+                       *fb = ~*fb;\r
+               break;\r
+       case 2:\r
+               for( i = 1; i < giVT_CharHeight-1; i++, fb += pitch ) {\r
+                       fb[0] = ~fb[0];\r
+                       fb[1] = ~fb[1];\r
+               }\r
+               break;\r
+       case 3:\r
+               for( i = 1; i < giVT_CharHeight-1; i++, fb += pitch ) {\r
+                       fb[0] = ~fb[0];\r
+                       fb[1] = ~fb[1];\r
+                       fb[2] = ~fb[2];\r
+               }\r
+               break;\r
+       case 4:\r
+               for( i = 1; i < giVT_CharHeight-1; i++, fb += pitch ) {\r
+                       fb[0] = ~fb[0];\r
+                       fb[1] = ~fb[1];\r
+                       fb[2] = ~fb[2];\r
+                       fb[3] = ~fb[3];\r
+               }\r
+               break;\r
+       default:\r
+               Log_Error("VESA", "Vesa_FlipCursor - Bug Report, unknown bytes_per_px (%i)", bytes_per_px);\r
+               giVesaCursorTimer = -1;\r
+               return ;\r
+       }\r
+       \r
+       #if BLINKING_CURSOR\r
+       giVesaCursorTimer = Time_CreateTimer(VESA_CURSOR_PERIOD, Vesa_FlipCursor, Arg);\r
+       #endif\r
+}\r
+\r
+// ------------------------\r
+// --- 2D Accelleration ---\r
+// ------------------------\r
+void Vesa_2D_Fill(void *Ent, Uint16 X, Uint16 Y, Uint16 W, Uint16 H, Uint32 Colour)\r
+{\r
+       // TODO: Handle non-32bit modes\r
+        int    pitch = gpVesaCurMode->pitch/4;\r
+       Uint32  *buf = (Uint32*)gpVesa_Framebuffer + Y*pitch + X;\r
+       while( H -- ) {\r
+               memsetd(buf, Colour, W);\r
+               buf += pitch;\r
+       }\r
+}\r
+\r
+void Vesa_2D_Blit(void *Ent, Uint16 DstX, Uint16 DstY, Uint16 SrcX, Uint16 SrcY, Uint16 W, Uint16 H)\r
+{\r
+        int    scrnpitch = gpVesaCurMode->pitch;\r
+        int    bytes_per_px = (gpVesaCurMode->bpp + 7) / 8;\r
+        int    dst = DstY*scrnpitch + DstX;\r
+        int    src = SrcY*scrnpitch + SrcX;\r
+        int    tmp;\r
+       \r
+       //Log("Vesa_2D_Blit: (Ent=%p, DstX=%i, DstY=%i, SrcX=%i, SrcY=%i, W=%i, H=%i)",\r
+       //      Ent, DstX, DstY, SrcX, SrcY, W, H);\r
+       \r
+       if(SrcX + W > gpVesaCurMode->width)\r
+               W = gpVesaCurMode->width - SrcX;\r
+       if(DstX + W > gpVesaCurMode->width)\r
+               W = gpVesaCurMode->width - DstX;\r
+       if(SrcY + H > gpVesaCurMode->height)\r
+               H = gpVesaCurMode->height - SrcY;\r
+       if(DstY + H > gpVesaCurMode->height)\r
+               H = gpVesaCurMode->height - DstY;\r
+       \r
+       //Debug("W = %i, H = %i", W, H);\r
+       \r
+       if( dst > src ) {\r
+               // Reverse copy\r
+               dst += H*scrnpitch;\r
+               src += H*scrnpitch;\r
+               while( H -- ) {\r
+                       dst -= scrnpitch;\r
+                       src -= scrnpitch;\r
+                       tmp = W*bytes_per_px;\r
+                       for( tmp = W; tmp --; ) {\r
+                               *(Uint8*)(gpVesa_Framebuffer + dst + tmp) = *(Uint8*)(gpVesa_Framebuffer + src + tmp);\r
+                       }\r
+               }\r
+       }\r
+       else {\r
+               // Normal copy is OK\r
+               while( H -- ) {\r
+                       memcpy((void*)gpVesa_Framebuffer + dst, (void*)gpVesa_Framebuffer + src, W*bytes_per_px);\r
+                       dst += scrnpitch;\r
+                       src += scrnpitch;\r
+               }\r
+       }\r
+       //Log("Vesa_2D_Blit: RETURN");\r
+}\r

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