xrdp/uirdesktop/bsops.c
2006-06-26 00:33:04 +00:00

823 lines
17 KiB
C
Executable File

/* -*- c-basic-offset: 8 -*-
rdesktop: A Remote Desktop Protocol client.
Generics backingstore operations
Copyright (C) Jay Sorg 2005-2006
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <string.h>
#include "bsops.h"
/* externals */
extern int g_width;
extern int g_height;
extern int g_bs_bpp;
extern int g_bs_Bpp;
extern char * g_bs;
/* globals */
static int g_clip_left = 0;
static int g_clip_top = 0;
static int g_clip_right = 800;
static int g_clip_bottom = 600;
/* for bs_patblt */
static unsigned char g_hatch_patterns[] =
{
0x00, 0x00, 0x00, 0xff, 0x00, 0x00, 0x00, 0x00, /* 0 - bsHorizontal */
0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, 0x08, /* 1 - bsVertical */
0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01, /* 2 - bsFDiagonal */
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, /* 3 - bsBDiagonal */
0x08, 0x08, 0x08, 0xff, 0x08, 0x08, 0x08, 0x08, /* 4 - bsCross */
0x81, 0x42, 0x24, 0x18, 0x18, 0x24, 0x42, 0x81 /* 5 - bsDiagCross */
};
/*****************************************************************************/
/* do a raster op */
int
bs_do_rop(int rop, int src, int dst)
{
switch (rop)
{
case 0x0: return 0;
case 0x1: return ~(src | dst);
case 0x2: return (~src) & dst;
case 0x3: return ~src;
case 0x4: return src & (~dst);
case 0x5: return ~(dst);
case 0x6: return src ^ dst;
case 0x7: return ~(src & dst);
case 0x8: return src & dst;
case 0x9: return ~(src) ^ dst;
case 0xa: return dst;
case 0xb: return (~src) | dst;
case 0xc: return src;
case 0xd: return src | (~dst);
case 0xe: return src | dst;
case 0xf: return ~0;
}
return dst;
}
/*****************************************************************************/
/* get a pixel from the in memory copy of whats on the screen */
int
bs_get_pixel(int x, int y)
{
char * p;
if (x >= 0 && x < g_width && y >= 0 && y < g_height)
{
p = g_bs + (y * g_width * g_bs_Bpp) + (x * g_bs_Bpp);
if (g_bs_Bpp == 1)
{
return *((unsigned char *) p);
}
else if (g_bs_Bpp == 2)
{
return *((unsigned short *) p);
}
else
{
return *((unsigned int *) p);
}
}
else
{
return 0;
}
}
/*****************************************************************************/
/* set a pixel on the screen using the clip */
void
bs_set_pixel(int x, int y, int pixel, int rop, int use_clip)
{
char * p;
if (!use_clip ||
(x >= g_clip_left && x < g_clip_right &&
y >= g_clip_top && y < g_clip_bottom))
{
if (x >= 0 && x < g_width && y >= 0 && y < g_height)
{
p = g_bs + (y * g_width * g_bs_Bpp) + (x * g_bs_Bpp);
if (rop != 12)
{
pixel = bs_do_rop(rop, pixel, bs_get_pixel(x, y));
}
if (g_bs_Bpp == 1)
{
*((unsigned char *) p) = pixel;
}
else if (g_bs_Bpp == 2)
{
*((unsigned short *) p) = pixel;
}
else
{
*((unsigned int *) p) = pixel;
}
}
}
}
/*****************************************************************************/
static char *
get_bs_ptr(int x, int y)
{
char * p;
if (x >= 0 && x < g_width && y >= 0 && y < g_height)
{
p = g_bs + (y * g_width * g_bs_Bpp) + (x * g_bs_Bpp);
return p;
}
else
{
return 0;
}
}
/*****************************************************************************/
void
bs_init(void)
{
g_clip_left = 0;
g_clip_top = 0;
g_clip_right = g_width;
g_clip_bottom = g_height;
}
/*****************************************************************************/
void
bs_exit(void)
{
}
/*****************************************************************************/
void
bs_set_clip(int x, int y, int cx, int cy)
{
g_clip_left = x;
g_clip_top = y;
g_clip_right = x + cx;
g_clip_bottom = y + cy;
}
/*****************************************************************************/
void
bs_reset_clip(void)
{
g_clip_left = 0;
g_clip_top = 0;
g_clip_right = g_width;
g_clip_bottom = g_height;
}
/*****************************************************************************/
/* check if a certain pixel is set in a bitmap */
int
bs_is_pixel_on(char * data, int x, int y, int width, int bpp)
{
int start;
int shift;
if (bpp == 1)
{
width = (width + 7) / 8;
start = (y * width) + x / 8;
shift = x % 8;
return (data[start] & (0x80 >> shift)) != 0;
}
else if (bpp == 8)
{
return data[y * width + x] != 0;
}
else if (bpp == 24)
{
return data[(y * 3) * width + (x * 3)] != 0 &&
data[(y * 3) * width + (x * 3) + 1] != 0 &&
data[(y * 3) * width + (x * 3) + 2] != 0;
}
else
{
return 0;
}
}
/*****************************************************************************/
void
bs_set_pixel_on(char * data, int x, int y, int width, int bpp,
int pixel)
{
int start;
int shift;
if (bpp == 1)
{
width = (width + 7) / 8;
start = (y * width) + x / 8;
shift = x % 8;
if (pixel != 0)
{
data[start] = data[start] | (0x80 >> shift);
}
else
{
data[start] = data[start] & ~(0x80 >> shift);
}
}
else if (bpp == 8)
{
data[y * width + x] = pixel;
}
else if (bpp == 15 || bpp == 16)
{
((unsigned short *) data)[y * width + x] = pixel;
}
}
/*****************************************************************************/
void
bs_copy_mem(char * d, char * s, int n)
{
while (n & (~7))
{
*(d++) = *(s++);
*(d++) = *(s++);
*(d++) = *(s++);
*(d++) = *(s++);
*(d++) = *(s++);
*(d++) = *(s++);
*(d++) = *(s++);
*(d++) = *(s++);
n = n - 8;
}
while (n > 0)
{
*(d++) = *(s++);
n--;
}
}
/*****************************************************************************/
void
bs_copy_memb(char * d, char * s, int n)
{
d = (d + n) - 1;
s = (s + n) - 1;
while (n & (~7))
{
*(d--) = *(s--);
*(d--) = *(s--);
*(d--) = *(s--);
*(d--) = *(s--);
*(d--) = *(s--);
*(d--) = *(s--);
*(d--) = *(s--);
*(d--) = *(s--);
n = n - 8;
}
while (n > 0)
{
*(d--) = *(s--);
n--;
}
}
/*****************************************************************************/
/* return true is the is something to draw */
int
bs_warp_coords(int * x, int * y, int * cx, int * cy,
int * srcx, int * srcy)
{
int dx;
int dy;
if (g_clip_left > *x)
{
dx = g_clip_left - *x;
}
else
{
dx = 0;
}
if (g_clip_top > *y)
{
dy = g_clip_top - *y;
}
else
{
dy = 0;
}
if (*x + *cx > g_clip_right)
{
*cx = (*cx - ((*x + *cx) - g_clip_right));
}
if (*y + *cy > g_clip_bottom)
{
*cy = (*cy - ((*y + *cy) - g_clip_bottom));
}
*cx = *cx - dx;
*cy = *cy - dy;
if (*cx <= 0)
{
return 0;
}
if (*cy <= 0)
{
return 0;
}
*x = *x + dx;
*y = *y + dy;
if (srcx != 0)
{
*srcx = *srcx + dx;
}
if (srcy != 0)
{
*srcy = *srcy + dy;
}
return 1;
}
/*****************************************************************************/
void
bs_rect(int x, int y, int cx, int cy, int colour, int rop)
{
int i;
int j;
unsigned char * p8;
unsigned short * p16;
unsigned int * p32;
if (bs_warp_coords(&x, &y, &cx, &cy, 0, 0))
{
if (rop == 0) /* black */
{
rop = 12;
colour = 0;
}
else if (rop == 15) /* white */
{
rop = 12;
colour = 0xffffff;
}
if (rop == 12) /* copy */
{
if (g_bs_Bpp == 1)
{
for (i = 0; i < cy; i++)
{
p8 = (unsigned char *) get_bs_ptr(x, y + i);
if (p8 != 0)
{
for (j = 0; j < cx; j++)
{
*p8 = colour;
p8++;
}
}
}
}
else if (g_bs_Bpp == 2)
{
for (i = 0; i < cy; i++)
{
p16 = (unsigned short *) get_bs_ptr(x, y + i);
if (p16 != 0)
{
for (j = 0; j < cx; j++)
{
*p16 = colour;
p16++;
}
}
}
}
else
{
for (i = 0; i < cy; i++)
{
p32 = (unsigned int *) get_bs_ptr(x, y + i);
if (p32 != 0)
{
for (j = 0; j < cx; j++)
{
*p32 = colour;
p32++;
}
}
}
}
}
else /* slow */
{
for (i = 0; i < cy; i++)
{
for (j = 0; j < cx; j++)
{
bs_set_pixel(j + x, i + y, colour, rop, 0);
}
}
}
}
}
/*****************************************************************************/
void
bs_screenblt(int rop, int x, int y, int cx, int cy,
int srcx, int srcy)
{
int p;
int i;
int j;
char * src;
char * dst;
if (bs_warp_coords(&x, &y, &cx, &cy, &srcx, &srcy))
{
if (rop == 12) /* copy */
{
if (srcy < y) /* copy down - bottom to top */
{
for (i = cy - 1; i >= 0; i--)
{
src = get_bs_ptr(srcx, srcy + i);
dst = get_bs_ptr(x, y + i);
if (src != 0 && dst != 0)
{
bs_copy_mem(dst, src, cx * g_bs_Bpp);
}
}
}
else if (srcy > y || srcx > x) /* copy up or left - top to bottom */
{
for (i = 0; i < cy; i++)
{
src = get_bs_ptr(srcx, srcy + i);
dst = get_bs_ptr(x, y + i);
if (src != 0 && dst != 0)
{
bs_copy_mem(dst, src, cx * g_bs_Bpp);
}
}
}
else /* copy straight right */
{
for (i = 0; i < cy; i++)
{
src = get_bs_ptr(srcx, srcy + i);
dst = get_bs_ptr(x, y + i);
if (src != 0 && dst != 0)
{
bs_copy_memb(dst, src, cx * g_bs_Bpp);
}
}
}
}
else /* slow */
{
if (srcy < y) /* copy down - bottom to top */
{
for (i = cy - 1; i >= 0; i--)
{
for (j = 0; j < cx; j++)
{
p = bs_get_pixel(srcx + j, srcy + i);
bs_set_pixel(x + j, y + i, p, rop, 0);
}
}
}
else if (srcy > y || srcx > x) /* copy up or left - top to bottom */
{
for (i = 0; i < cy; i++)
{
for (j = 0; j < cx; j++)
{
p = bs_get_pixel(srcx + j, srcy + i);
bs_set_pixel(x + j, y + i, p, rop, 0);
}
}
}
else /* copy straight right */
{
for (i = 0; i < cy; i++)
{
for (j = cx - 1; j >= 0; j--)
{
p = bs_get_pixel(srcx + j, srcy + i);
bs_set_pixel(x + j, y + i, p, rop, 0);
}
}
}
}
}
}
/*****************************************************************************/
void
bs_memblt(int opcode, int x, int y, int cx, int cy,
void * srcdata, int srcwidth, int srcheight,
int srcx, int srcy)
{
int i;
int j;
int p;
char * dst;
char * src;
if (bs_warp_coords(&x, &y, &cx, &cy, &srcx, &srcy))
{
if (opcode == 12) /* copy */
{
if (g_bs_Bpp == 1)
{
src = (char *) (((unsigned char *) srcdata) + srcy * srcwidth + srcx);
}
else if (g_bs_Bpp == 2)
{
src = (char *) (((unsigned short *) srcdata) + srcy * srcwidth + srcx);
}
else
{
src = (char *) (((unsigned int *) srcdata) + srcy * srcwidth + srcx);
}
for (i = 0; i < cy; i++)
{
dst = get_bs_ptr(x, y + i);
if (dst != 0)
{
bs_copy_mem(dst, src, cx * g_bs_Bpp);
src += srcwidth * g_bs_Bpp;
}
}
}
else /* slow */
{
if (g_bs_Bpp == 1)
{
for (i = 0; i < cy; i++)
{
for (j = 0; j < cx; j++)
{
p = *(((unsigned char *) srcdata) +
((i + srcy) * srcwidth + (j + srcx)));
bs_set_pixel(x + j, y + i, p, opcode, 0);
}
}
}
else if (g_bs_Bpp == 2)
{
for (i = 0; i < cy; i++)
{
for (j = 0; j < cx; j++)
{
p = *(((unsigned short *) srcdata) +
((i + srcy) * srcwidth + (j + srcx)));
bs_set_pixel(x + j, y + i, p, opcode, 0);
}
}
}
else
{
for (i = 0; i < cy; i++)
{
for (j = 0; j < cx; j++)
{
p = *(((unsigned int *) srcdata) +
((i + srcy) * srcwidth + (j + srcx)));
bs_set_pixel(x + j, y + i, p, opcode, 0);
}
}
}
}
}
}
/*****************************************************************************/
void
bs_draw_glyph(int x, int y, char * glyph_data, int glyph_width,
int glyph_height, int fgcolour)
{
int i;
int j;
for (i = 0; i < glyph_height; i++)
{
for (j = 0; j < glyph_width; j++)
{
if (bs_is_pixel_on(glyph_data, j, i, glyph_width, 8))
{
bs_set_pixel(x + j, y + i, fgcolour, 12, 1);
}
}
}
}
/*****************************************************************************/
/* Bresenham's line drawing algorithm */
void
bs_line(int opcode, int startx, int starty, int endx, int endy,
int pen_width, int pen_style, int pen_colour)
{
int dx;
int dy;
int incx;
int incy;
int dpr;
int dpru;
int p;
if (startx > endx)
{
dx = startx - endx;
incx = -1;
}
else
{
dx = endx - startx;
incx = 1;
}
if (starty > endy)
{
dy = starty - endy;
incy = -1;
}
else
{
dy = endy - starty;
incy = 1;
}
if (dx >= dy)
{
dpr = dy << 1;
dpru = dpr - (dx << 1);
p = dpr - dx;
for (; dx >= 0; dx--)
{
if (startx != endx || starty != endy)
{
bs_set_pixel(startx, starty, pen_colour, opcode, 1);
}
if (p > 0)
{
startx += incx;
starty += incy;
p += dpru;
}
else
{
startx += incx;
p += dpr;
}
}
}
else
{
dpr = dx << 1;
dpru = dpr - (dy << 1);
p = dpr - dy;
for (; dy >= 0; dy--)
{
if (startx != endx || starty != endy)
{
bs_set_pixel(startx, starty, pen_colour, opcode, 1);
}
if (p > 0)
{
startx += incx;
starty += incy;
p += dpru;
}
else
{
starty += incy;
p += dpr;
}
}
}
}
/*****************************************************************************/
void
bs_patblt(int opcode, int x, int y, int cx, int cy,
int brush_style, char * brush_pattern,
int brush_x_org, int brush_y_org,
int bgcolour, int fgcolour)
{
int i;
int j;
char ipattern[8];
char * b;
b = 0;
switch (brush_style)
{
case 0:
bs_rect(x, y, cx, cy, fgcolour, opcode);
break;
case 2: /* Hatch */
b = g_hatch_patterns + brush_pattern[0] * 8;
break;
case 3:
for (i = 0; i < 8; i++)
{
ipattern[i] = ~brush_pattern[7 - i];
}
b = ipattern;
break;
}
if (b != 0)
{
for (i = 0; i < cy; i++)
{
for (j = 0; j < cx; j++)
{
if (bs_is_pixel_on(b, (x + j + brush_x_org) % 8,
(y + i + brush_y_org) % 8, 8, 1))
{
bs_set_pixel(x + j, y + i, fgcolour, opcode, 1);
}
else
{
bs_set_pixel(x + j, y + i, bgcolour, opcode, 1);
}
}
}
}
}
/*****************************************************************************/
void
bs_copy_box(char * dst, int x, int y, int cx, int cy, int line_size)
{
char * src;
int i;
/* shouldn't happen */
if (cx < 1 || cy < 1)
{
return;
}
/* nothing to draw, memset and leave */
if (x + cx < 0 || y + cy < 0 || x >= g_width || y >= g_height)
{
memset(dst, 0, cx * cy * g_bs_Bpp);
return;
}
/* check if it goes over an edge */
if (x < 0 || y < 0 || x + cx > g_width || y + cy > g_height)
{
memset(dst, 0, cx * cy * g_bs_Bpp);
if (x < 0)
{
cx += x;
dst += -x * g_bs_Bpp;
x = 0;
}
if (x + cx > g_width)
{
cx = g_width - x;
}
for (i = 0; i < cy; i++)
{
src = get_bs_ptr(x, y + i);
if (src != 0)
{
bs_copy_mem(dst, src, cx * g_bs_Bpp);
}
dst += line_size;
}
}
else /* whole box is within */
{
for (i = 0; i < cy; i++)
{
src = get_bs_ptr(x, y + i);
if (src != 0)
{
bs_copy_mem(dst, src, cx * g_bs_Bpp);
}
dst += line_size;
}
}
}