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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
/* Graphics support functions for drivers and replacements for driver functions
** for use with the graphical state manager
*/
#include "sci/gfx/gfx_system.h"
#include "sci/gfx/gfx_tools.h"
#include "sci/gfx/line.h"
#include "sci/gfx/crossblit.h"
namespace Sci {
int gfx_crossblit_alpha_threshold = 128;
static void gfx_draw_line_buffer(byte *buffer, int linewidth, int pixelwidth,
Common::Point start, Common::Point end, unsigned int color) {
switch (pixelwidth) {
case 1:
_gfx_draw_line_buffer<1>(buffer, linewidth, start, end, color);
return;
case 2:
_gfx_draw_line_buffer<2>(buffer, linewidth, start, end, color);
return;
case 3:
_gfx_draw_line_buffer<3>(buffer, linewidth, start, end, color);
return;
case 4:
_gfx_draw_line_buffer<4>(buffer, linewidth, start, end, color);
return;
default:
GFXERROR("pixelwidth=%d not supported!\n", pixelwidth);
return;
}
}
void gfx_draw_line_pixmap_i(gfx_pixmap_t *pxm, Common::Point start, Common::Point end, int color) {
gfx_draw_line_buffer(pxm->index_data, pxm->index_xl, 1, start, end, color);
}
void gfx_draw_box_buffer(byte *buffer, int linewidth, rect_t zone, int color) {
byte *dest = buffer + zone.x + (linewidth * zone.y);
int i;
if (zone.xl <= 0 || zone.yl <= 0)
return;
for (i = 0; i < zone.yl; i++) {
memset(dest, color, zone.xl);
dest += linewidth;
}
}
void gfx_draw_box_pixmap_i(gfx_pixmap_t *pxm, rect_t box, int color) {
gfx_clip_box_basic(&box, pxm->index_xl - 1, pxm->index_yl - 1);
gfx_draw_box_buffer(pxm->index_data, pxm->index_xl, box, color);
}
static void (*crossblit_fns[5])(byte *, byte *, int, int, int, int, byte *, int, int, unsigned int, unsigned int, byte *, int, int, int) = { NULL,
_gfx_crossblit<1, false, false>,
_gfx_crossblit<2, false, false>,
_gfx_crossblit<3, false, false>,
_gfx_crossblit<4, false, false>
};
static void (*crossblit_fns_P[5])(byte *, byte *, int, int, int, int, byte *, int, int, unsigned int, unsigned int, byte *, int, int, int) = { NULL,
_gfx_crossblit<1, true, false>,
_gfx_crossblit<2, true, false>,
_gfx_crossblit<3, true, false>,
_gfx_crossblit<4, true, false>
};
static void (*crossblit_fns_RA[5])(byte *, byte *, int, int, int, int, byte *, int, int, unsigned int, unsigned int, byte *, int, int, int) = { NULL,
_gfx_crossblit<1, false, true>,
_gfx_crossblit<2, false, true>,
_gfx_crossblit<3, false, true>,
_gfx_crossblit<4, false, true>
};
static void (*crossblit_fns_P_RA[5])(byte *, byte *, int, int, int, int, byte *, int, int, unsigned int, unsigned int, byte *, int, int, int) = { NULL,
_gfx_crossblit<1, true, true>,
_gfx_crossblit<2, true, true>,
_gfx_crossblit<3, true, true>,
_gfx_crossblit<4, true, true>
};
void _gfx_crossblit_simple(byte *dest, byte *src, int dest_line_width, int src_line_width, int xl, int yl, int bpp) {
int line_width = xl * bpp;
int i;
for (i = 0; i < yl; i++) {
memcpy(dest, src, line_width);
dest += dest_line_width;
src += src_line_width;
}
}
int gfx_crossblit_pixmap(gfx_mode_t *mode, gfx_pixmap_t *pxm, int priority, rect_t src_coords, rect_t dest_coords,
byte *dest, int dest_line_width, byte *priority_dest, int priority_line_width, int priority_skip, int flags) {
int maxx = 320 * mode->xfact;
int maxy = 200 * mode->yfact;
byte *src = pxm->data;
byte *alpha = pxm->alpha_map ? pxm->alpha_map : pxm->data;
byte *priority_pos = priority_dest;
unsigned int alpha_mask, alpha_min;
int bpp = mode->bytespp;
int bytes_per_alpha_pixel = pxm->alpha_map ? 1 : bpp;
int bytes_per_alpha_line = bytes_per_alpha_pixel * pxm->xl;
int xl = pxm->xl, yl = pxm->yl;
int xoffset = (dest_coords.x < 0) ? - dest_coords.x : 0;
int yoffset = (dest_coords.y < 0) ? - dest_coords.y : 0;
int revalpha = mode->flags & GFX_MODE_FLAG_REVERSE_ALPHA;
if (src_coords.x + src_coords.xl > xl)
src_coords.xl = xl - src_coords.x;
if (src_coords.y + src_coords.yl > yl)
src_coords.yl = yl - src_coords.y;
// --???--
if (src_coords.y > yl)
return GFX_OK;
if (src_coords.x > xl)
return GFX_OK;
// --???--
if (dest_coords.x + xl >= maxx)
xl = maxx - dest_coords.x;
if (dest_coords.y + yl >= maxy)
yl = maxy - dest_coords.y;
xl -= xoffset;
yl -= yoffset;
if (!pxm->data)
return GFX_ERROR;
if (xl <= 0 || yl <= 0)
return GFX_OK;
// Set destination offsets
// Set x offsets
if (!(flags & GFX_CROSSBLIT_FLAG_DATA_IS_HOMED))
dest += dest_coords.x * bpp;
priority_pos += dest_coords.x * priority_skip;
// Set y offsets
if (!(flags & GFX_CROSSBLIT_FLAG_DATA_IS_HOMED))
dest += dest_coords.y * dest_line_width;
priority_pos += dest_coords.y * priority_line_width;
// Set source offsets
if (xoffset += src_coords.x) {
dest_coords.x = 0;
src += xoffset * bpp;
alpha += xoffset * bytes_per_alpha_pixel;
}
if (yoffset += src_coords.y) {
dest_coords.y = 0;
src += yoffset * bpp * pxm->xl;
alpha += yoffset * bytes_per_alpha_line;
}
// Adjust length for clip box
if (xl > src_coords.xl)
xl = src_coords.xl;
if (yl > src_coords.yl)
yl = src_coords.yl;
// now calculate alpha
if (pxm->alpha_map)
alpha_mask = 0xff;
else {
int shift_nr = 0;
alpha_mask = mode->alpha_mask;
if (!alpha_mask && pxm->alpha_map) {
GFXERROR("Invalid alpha mode: both pxm->alpha_map and alpha_mask are white!\n");
return GFX_ERROR;
}
if (alpha_mask) {
while (!(alpha_mask & 0xff)) {
alpha_mask >>= 8;
shift_nr++;
}
alpha_mask &= 0xff;
}
#ifdef SCUMM_BIG_ENDIAN
alpha += (mode->bytespp) - (shift_nr + 1);
#else
alpha += shift_nr;
#endif
}
if (alpha_mask & 0xff)
alpha_min = ((alpha_mask * gfx_crossblit_alpha_threshold) >> 8) & alpha_mask;
else
alpha_min = ((alpha_mask >> 8) * gfx_crossblit_alpha_threshold) & alpha_mask;
if (revalpha)
alpha_min = 255 - alpha_min; // Since we use it for the reverse effect
if (!alpha_mask)
_gfx_crossblit_simple(dest, src, dest_line_width, pxm->xl * bpp, xl, yl, bpp);
else
if (priority == GFX_NO_PRIORITY) {
if (bpp > 0 && bpp < 5)
((revalpha) ? crossblit_fns_RA : crossblit_fns)[bpp](dest, src, dest_line_width, pxm->xl * bpp,
xl, yl, alpha, bytes_per_alpha_line, bytes_per_alpha_pixel, alpha_mask, alpha_min,
0, 0, 0, 0);
else {
GFXERROR("Invalid mode->bytespp: %d\n", mode->bytespp);
return GFX_ERROR;
}
} else { // priority
if (bpp > 0 && bpp < 5)
((revalpha) ? crossblit_fns_P_RA : crossblit_fns_P)[bpp](dest, src, dest_line_width, pxm->xl * bpp,
xl, yl, alpha, bytes_per_alpha_line, bytes_per_alpha_pixel, alpha_mask, alpha_min,
priority_pos, priority_line_width, priority_skip, priority);
else {
GFXERROR("Invalid mode->bytespp: %d\n", mode->bytespp);
return GFX_ERROR;
}
}
return GFX_OK;
}
} // End of namespace Sci
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