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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"
namespace Sci {
#define LINEMACRO(startx, starty, deltalinear, deltanonlinear, linearvar, nonlinearvar, \
linearend, nonlinearstart, linearmod, nonlinearmod) \
incrNE = ((deltalinear) > 0) ? (deltalinear) : -(deltalinear); \
incrNE <<= 1; \
deltanonlinear <<= 1; \
incrE = ((deltanonlinear) > 0) ? -(deltanonlinear) : (deltanonlinear); \
d = nonlinearstart - 1; \
while (linearvar != (linearend)) { \
memcpy(buffer + linewidth * (starty) + (startx), &color, PIXELWIDTH); \
linearvar += linearmod; \
if ((d += incrE) < 0) { \
d += incrNE; \
nonlinearvar += nonlinearmod; \
}; \
}; \
memcpy(buffer + linewidth * (starty) + (startx), &color, PIXELWIDTH);
template <int PIXELWIDTH>
void _gfx_draw_line_buffer(byte *buffer, int linewidth, Common::Point start, Common::Point end, unsigned int color) {
int incrE, incrNE, d;
int dx = ABS(end.x - start.x);
int dy = ABS(end.y - start.y);
#ifdef SCUMM_BIG_ENDIAN
color = SWAP_BYTES_32(color);
#endif
if (dx > dy) {
int sign1 = (end.x < start.x) ? -1 : 1;
int sign2 = (end.y < start.y) ? -1 : 1;
LINEMACRO(start.x, start.y, dx, dy, start.x, start.y, end.x, dx, sign1 * PIXELWIDTH, sign2);
} else { // dx <= dy
int sign1 = (end.y < start.y) ? -1 : 1;
int sign2 = (end.x < start.x) ? -1 : 1;
LINEMACRO(start.x, start.y, dy, dx, start.y, start.x, end.y, dy, sign1, sign2 * PIXELWIDTH);
}
}
#undef LINEMACRO
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:
error("pixelwidth=%d not supported", 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_width, 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.width <= 0 || zone.height <= 0)
return;
for (i = 0; i < zone.height; i++) {
memset(dest, color, zone.width);
dest += linewidth;
}
}
void gfx_draw_box_pixmap_i(gfx_pixmap_t *pxm, rect_t box, int color) {
gfx_clip_box_basic(&box, pxm->index_width - 1, pxm->index_height - 1);
gfx_draw_box_buffer(pxm->index_data, pxm->index_width, box, color);
}
/* Template parameters:
* BYTESPP: Bytes per pixel
* USE_PRIORITY: Whether to care about the priority buffer
*/
template <int BYTESPP, bool USE_PRIORITY>
void _gfx_crossblit(byte *dest, byte *src, int bytes_per_dest_line, int bytes_per_src_line,
int xl, int yl, byte *alpha, int bytes_per_alpha_line, int bytes_per_alpha_pixel,
unsigned int alpha_test_mask, unsigned int alpha_min,
byte *priority_buffer, int bytes_per_priority_line, int bytes_per_priority_pixel, int priority
) {
int x, y;
int alpha_end = xl * bytes_per_alpha_pixel;
for (y = 0; y < yl; y++) {
int pixel_offset = 0;
int alpha_offset = 0;
int priority_offset = 0;
for (x = 0; x < alpha_end; x += bytes_per_alpha_pixel) {
if (((alpha_test_mask & alpha[x]) < alpha_min) ^ 1) {
if (USE_PRIORITY) {
if (priority_buffer[priority_offset] <= priority) {
priority_buffer[priority_offset] = priority;
memcpy(dest + pixel_offset, src + pixel_offset, BYTESPP);
}
} else {
memcpy(dest + pixel_offset, src + pixel_offset, BYTESPP);
}
}
pixel_offset += BYTESPP;
alpha_offset += bytes_per_alpha_pixel;
if (USE_PRIORITY)
priority_offset += bytes_per_priority_pixel;
}
dest += bytes_per_dest_line;
src += bytes_per_src_line;
alpha += bytes_per_alpha_line;
if (USE_PRIORITY)
priority_buffer += bytes_per_priority_line;
}
}
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>,
_gfx_crossblit<2, false>,
_gfx_crossblit<3, false>,
_gfx_crossblit<4, 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>,
_gfx_crossblit<2, true>,
_gfx_crossblit<3, true>,
_gfx_crossblit<4, 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 = bpp;
int bytes_per_alpha_line = bytes_per_alpha_pixel * pxm->width;
int xl = pxm->width, yl = pxm->height;
int xoffset = (dest_coords.x < 0) ? - dest_coords.x : 0;
int yoffset = (dest_coords.y < 0) ? - dest_coords.y : 0;
if (src_coords.x + src_coords.width > xl)
src_coords.width = xl - src_coords.x;
if (src_coords.y + src_coords.height > yl)
src_coords.height = 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->width;
alpha += yoffset * bytes_per_alpha_line;
}
// Adjust length for clip box
if (xl > src_coords.width)
xl = src_coords.width;
if (yl > src_coords.height)
yl = src_coords.height;
// now calculate alpha
if (pxm->alpha_map)
alpha_mask = 0xff;
else {
int shift_nr = 0;
alpha_mask = 0;
if (!alpha_mask && pxm->alpha_map) {
error("Invalid alpha mode: both pxm->alpha_map and alpha_mask are white");
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
}
/**
* Crossblitting functions use this value as threshold for distinguishing
* between transparent and opaque wrt alpha values.
*/
int gfx_crossblit_alpha_threshold = 0x90; // was 128
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;
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->width * bpp, xl, yl, bpp);
else
if (priority == GFX_NO_PRIORITY) {
if (bpp > 0 && bpp < 5)
crossblit_fns[bpp](dest, src, dest_line_width, pxm->width * bpp,
xl, yl, alpha, bytes_per_alpha_line, bytes_per_alpha_pixel, alpha_mask, alpha_min,
0, 0, 0, 0);
else {
error("Invalid mode->bytespp: %d", mode->bytespp);
return GFX_ERROR;
}
} else { // priority
if (bpp > 0 && bpp < 5)
crossblit_fns_P[bpp](dest, src, dest_line_width, pxm->width * 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 {
error("Invalid mode->bytespp: %d", mode->bytespp);
return GFX_ERROR;
}
}
return GFX_OK;
}
} // End of namespace Sci
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