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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.
*
* $URL$
* $Id$
*
*/
#include "common/endian.h"
#include "sci/gfx/gfx_system.h"
#include "sci/gfx/gfx_resource.h"
#include "sci/gfx/gfx_tools.h"
namespace Sci {
gfx_pixmap_t *gfxr_draw_cel0(int id, int loop, int cel, byte *resource, int size, gfxr_view_t *view, int mirrored) {
int xl = READ_LE_UINT16(resource);
int yl = READ_LE_UINT16(resource + 2);
int xhot = ((signed char *)resource)[4];
int yhot = ((signed char *)resource)[5];
int color_key = resource[6];
int pos = 7;
int writepos = mirrored ? xl : 0;
int pixmap_size = xl * yl;
int line_base = 0;
gfx_pixmap_t *retval = gfx_pixmap_alloc_index_data(gfx_new_pixmap(xl, yl, id, loop, cel));
byte *dest = retval->index_data;
retval->color_key = 255; // Pick something larger than 15
retval->xoffset = mirrored ? xhot : -xhot;
retval->yoffset = -yhot;
if (view) {
retval->palette = view->palette->getref();
} else {
retval->palette = gfx_sci0_image_pal[sci0_palette]->getref();
}
if (xl <= 0 || yl <= 0) {
gfx_free_pixmap(retval);
GFXERROR("View %02x:(%d/%d) has invalid xl=%d or yl=%d\n", id, loop, cel, xl, yl);
return NULL;
}
if (mirrored) {
while (yl && pos < size) {
int op = resource[pos++];
int count = op >> 4;
int color = op & 0xf;
if (view->flags & GFX_PIXMAP_FLAG_PALETTIZED)
color = view->translation[color];
if (color == color_key)
color = retval->color_key;
while (count) {
int pixels = writepos - line_base;
if (pixels > count)
pixels = count;
writepos -= pixels;
memset(dest + writepos, color, pixels);
count -= pixels;
if (writepos == line_base) {
yl--;
writepos += (xl << 1);
line_base += xl;
}
}
}
} else {
while (writepos < pixmap_size && pos < size) {
int op = resource[pos++];
int count = op >> 4;
int color = op & 0xf;
if (view && (view->flags & GFX_PIXMAP_FLAG_PALETTIZED))
color = view->translation[color];
if (color == color_key)
color = retval->color_key;
if (writepos + count > pixmap_size) {
GFXERROR("View %02x:(%d/%d) writes RLE data over its designated end at rel. offset 0x%04x\n", id, loop, cel, pos);
return NULL;
}
memset(dest + writepos, color, count);
writepos += count;
}
}
return retval;
}
static int gfxr_draw_loop0(gfxr_loop_t *dest, int id, int loop, byte *resource, int offset, int size, gfxr_view_t *view, int mirrored) {
int i;
int cels_nr = READ_LE_UINT16(resource + offset);
if (READ_LE_UINT16(resource + offset + 2)) {
GFXWARN("View %02x:(%d): Gray magic %04x in loop, expected white\n", id, loop, READ_LE_UINT16(resource + offset + 2));
}
if (cels_nr * 2 + 4 + offset > size) {
GFXERROR("View %02x:(%d): Offset array for %d cels extends beyond resource space\n", id, loop, cels_nr);
dest->cels_nr = 0; /* Mark as "delete no cels" */
dest->cels = NULL;
return 1;
}
dest->cels = (gfx_pixmap_t**)malloc(sizeof(gfx_pixmap_t *) * cels_nr);
for (i = 0; i < cels_nr; i++) {
int cel_offset = READ_LE_UINT16(resource + offset + 4 + (i << 1));
gfx_pixmap_t *cel = NULL;
if (cel_offset >= size) {
GFXERROR("View %02x:(%d/%d) supposed to be at illegal offset 0x%04x\n", id, loop, i, cel_offset);
cel = NULL;
} else
cel = gfxr_draw_cel0(id, loop, i, resource + cel_offset, size - cel_offset, view, mirrored);
if (!cel) {
dest->cels_nr = i;
return 1;
}
dest->cels[i] = cel;
}
dest->cels_nr = cels_nr;
return 0;
}
#define V0_LOOPS_NR_OFFSET 0
#define V0_FIRST_LOOP_OFFSET 8
#define V0_MIRROR_LIST_OFFSET 2
gfxr_view_t *gfxr_draw_view0(int id, byte *resource, int size, int palette) {
int i;
gfxr_view_t *view;
int mirror_bitpos = 1;
int mirror_bytepos = V0_MIRROR_LIST_OFFSET;
int palette_ofs = READ_LE_UINT16(resource + 6);
if (size < V0_FIRST_LOOP_OFFSET + 8) {
GFXERROR("Attempt to draw empty view %04x\n", id);
return NULL;
}
view = (gfxr_view_t *)malloc(sizeof(gfxr_view_t));
view->ID = id;
view->loops_nr = resource[V0_LOOPS_NR_OFFSET];
// Set palette
view->flags = 0;
view->palette = gfx_sci0_image_pal[sci0_palette]->getref();
if ((palette_ofs) && (palette >= 0)) {
byte *paldata = resource + palette_ofs + (palette * GFX_SCI0_IMAGE_COLORS_NR);
for (i = 0; i < GFX_SCI0_IMAGE_COLORS_NR; i++)
view->translation[i] = *(paldata++);
view->flags |= GFX_PIXMAP_FLAG_PALETTIZED;
}
if (view->loops_nr * 2 + V0_FIRST_LOOP_OFFSET > size) {
GFXERROR("View %04x: Not enough space in resource to accomodate for the claimed %d loops\n", id, view->loops_nr);
free(view);
return NULL;
}
view->loops = (gfxr_loop_t*)malloc(sizeof(gfxr_loop_t) * ((view->loops_nr) ? view->loops_nr : 1)); /* Alloc 1 if no loop */
for (i = 0; i < view->loops_nr; i++) {
int error_token = 0;
int loop_offset = READ_LE_UINT16(resource + V0_FIRST_LOOP_OFFSET + (i << 1));
int mirrored = resource[mirror_bytepos] & mirror_bitpos;
if ((mirror_bitpos <<= 1) == 0x100) {
mirror_bytepos++;
mirror_bitpos = 1;
}
if (loop_offset >= size) {
GFXERROR("View %04x:(%d) supposed to be at illegal offset 0x%04x\n", id, i, loop_offset);
error_token = 1;
}
if (error_token || gfxr_draw_loop0(view->loops + i, id, i, resource, loop_offset, size, view, mirrored)) {
// An error occured
view->loops_nr = i;
gfxr_free_view(view);
return NULL;
}
}
return view;
}
} // End of namespace Sci
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