diff options
Diffstat (limited to 'src/glut/fbdev/cursor.c')
| -rw-r--r-- | src/glut/fbdev/cursor.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/src/glut/fbdev/cursor.c b/src/glut/fbdev/cursor.c new file mode 100644 index 0000000000..b753a5c9ff --- /dev/null +++ b/src/glut/fbdev/cursor.c @@ -0,0 +1,260 @@ +/* + * Mesa 3-D graphics library + * Version: 6.5 + * Copyright (C) 1995-2006 Brian Paul + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Library General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Library General Public License for more details. + * + * You should have received a copy of the GNU Library General Public + * License along with this library; if not, write to the Free + * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +/* + * Library for glut using mesa fbdev driver + * + * Written by Sean D'Epagnier (c) 2006 + */ + +/* these routines are written to access graphics memory directly, not using mesa + to render the cursor, this is faster, and */ + +#include <stdlib.h> +#include <inttypes.h> + +#include <linux/fb.h> + +#include <GL/glut.h> + +#include "internal.h" +#include "cursors.h" + +int CurrentCursor = GLUT_CURSOR_LEFT_ARROW; + +static int LastMouseX, LastMouseY; +static unsigned char *MouseBuffer; + +void InitializeCursor(void) +{ + if((MouseBuffer = malloc(CURSOR_WIDTH * CURSOR_HEIGHT + * VarInfo.bits_per_pixel / 8)) == NULL) { + sprintf(exiterror, "malloc failure\n"); + exit(0); + } + + MouseX = VarInfo.xres / 2; + MouseY = VarInfo.yres / 2; +} + +void EraseCursor(void) +{ + int off = LastMouseY * FixedInfo.line_length + + LastMouseX * VarInfo.bits_per_pixel / 8; + int stride = CURSOR_WIDTH * VarInfo.bits_per_pixel / 8; + int i; + + unsigned char *src = MouseBuffer; + + for(i = 0; i<CURSOR_HEIGHT; i++) { + memcpy(BackBuffer + off, src, stride); + src += stride; + off += FixedInfo.line_length; + } +} + +static void SaveCursor(int x, int y) +{ + int bypp, off, stride, i; + unsigned char *src = MouseBuffer; + + if(x < 0) + LastMouseX = 0; + else + if(x > (int)VarInfo.xres - CURSOR_WIDTH) + LastMouseX = VarInfo.xres - CURSOR_WIDTH; + else + LastMouseX = x; + + if(y < 0) + LastMouseY = 0; + else + if(y > (int)VarInfo.yres - CURSOR_HEIGHT) + LastMouseY = VarInfo.yres - CURSOR_HEIGHT; + else + LastMouseY = y; + + bypp = VarInfo.bits_per_pixel / 8; + off = LastMouseY * FixedInfo.line_length + LastMouseX * bypp; + stride = CURSOR_WIDTH * bypp; + for(i = 0; i<CURSOR_HEIGHT; i++) { + memcpy(src, BackBuffer + off, stride); + src += stride; + off += FixedInfo.line_length; + } +} + +void DrawCursor(void) +{ + int i, j, px, py, xoff, xlen, yoff, ylen, bypp, cstride, dstride; + unsigned char *c; + const unsigned char *d; + + if(CurrentCursor < 0 || CurrentCursor >= NUM_CURSORS) + return; + + px = MouseX - CursorsXOffset[CurrentCursor]; + py = MouseY - CursorsYOffset[CurrentCursor]; + + SaveCursor(px, py); + + xoff = 0; + if(px < 0) + xoff = -px; + + xlen = CURSOR_WIDTH; + if(px + CURSOR_WIDTH > VarInfo.xres) + xlen = VarInfo.xres - px; + + yoff = 0; + if(py < 0) + yoff = -py; + + ylen = CURSOR_HEIGHT; + if(py + CURSOR_HEIGHT > VarInfo.yres) + ylen = VarInfo.yres - py; + + bypp = VarInfo.bits_per_pixel / 8; + + c = BackBuffer + FixedInfo.line_length * (py + yoff) + (px + xoff) * bypp; + cstride = FixedInfo.line_length - bypp * (xlen - xoff); + + d = Cursors[CurrentCursor] + (CURSOR_WIDTH * yoff + xoff)*4; + dstride = (CURSOR_WIDTH - xlen + xoff) * 4; + + switch(bypp) { + case 1: + { + const int shift = 8 - REVERSECMAPSIZELOG; + for(i = yoff; i < ylen; i++) { + for(j = xoff; j < xlen; j++) { + if(d[3] < 220) + *c = ReverseColorMap + [(d[0]+(((int)(RedColorMap[c[0]]>>8)*d[3])>>8))>>shift] + [(d[1]+(((int)(GreenColorMap[c[0]]>>8)*d[3])>>8))>>shift] + [(d[2]+(((int)(BlueColorMap[c[0]]>>8)*d[3])>>8))>>shift]; + c++; + d+=4; + } + d += dstride; + c += cstride; + } + } break; + case 2: + { + uint16_t *e = (void*)c; + cstride /= 2; + for(i = yoff; i < ylen; i++) { + for(j = xoff; j < xlen; j++) { + e[0] = ((((d[0] + (((int)(((e[0] >> 8) & 0xf8) + | ((c[0] >> 11) & 0x7)) * d[3]) >> 8)) & 0xf8) << 8) + | (((d[1] + (((int)(((e[0] >> 3) & 0xfc) + | ((e[0] >> 5) & 0x3)) * d[3]) >> 8)) & 0xfc) << 3) + | ((d[2] + (((int)(((e[0] << 3) & 0xf8) + | (e[0] & 0x7)) * d[3]) >> 8)) >> 3)); + + e++; + d+=4; + } + d += dstride; + e += cstride; + } + } break; + case 3: + case 4: + for(i = yoff; i < ylen; i++) { + for(j = xoff; j < xlen; j++) { + c[0] = d[0] + (((int)c[0] * d[3]) >> 8); + c[1] = d[1] + (((int)c[1] * d[3]) >> 8); + c[2] = d[2] + (((int)c[2] * d[3]) >> 8); + + c+=bypp; + d+=4; + } + d += dstride; + c += cstride; + } break; + } +} + +#define MIN(x, y) x < y ? x : y +void SwapCursor(void) +{ + int px = MouseX - CursorsXOffset[CurrentCursor]; + int py = MouseY - CursorsYOffset[CurrentCursor]; + + int minx = MIN(px, LastMouseX); + int sizex = abs(px - LastMouseX); + + int miny = MIN(py, LastMouseY); + int sizey = abs(py - LastMouseY); + + DrawCursor(); + /* now update the portion of the screen that has changed */ + + if(DisplayMode & GLUT_DOUBLE && (sizex || sizey)) { + int off, stride, i; + if(minx < 0) + minx = 0; + if(miny < 0) + miny = 0; + + if(minx + sizex > VarInfo.xres) + sizex = VarInfo.xres - minx; + if(miny + sizey > VarInfo.yres) + sizey = VarInfo.yres - miny; + off = FixedInfo.line_length * miny + + minx * VarInfo.bits_per_pixel / 8; + stride = (sizex + CURSOR_WIDTH) * VarInfo.bits_per_pixel / 8; + + for(i = 0; i< sizey + CURSOR_HEIGHT; i++) { + memcpy(FrameBuffer+off, BackBuffer+off, stride); + off += FixedInfo.line_length; + } + } +} + +void glutWarpPointer(int x, int y) +{ + if(x < 0) + x = 0; + if(x >= VarInfo.xres) + x = VarInfo.xres - 1; + MouseX = x; + + if(y < 0) + y = 0; + if(y >= VarInfo.yres) + y = VarInfo.yres - 1; + MouseY = y; + + EraseCursor(); + SwapCursor(); +} + +void glutSetCursor(int cursor) +{ + if(cursor == GLUT_CURSOR_FULL_CROSSHAIR) + cursor = GLUT_CURSOR_CROSSHAIR; + CurrentCursor = cursor; + MouseEnabled = 1; + EraseCursor(); + SwapCursor(); +} |