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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.
*
* $URL$
* $Id$
*
*/
// SCI 1 view resource defrobnicator
#include "common/endian.h"
#include "sci/gfx/gfx_system.h"
#include "sci/gfx/gfx_resource.h"
#include "sci/gfx/gfx_tools.h"
namespace Sci {
#define V1_LOOPS_NR_OFFSET 0
#define V1_MIRROR_MASK 2
#define V1_PALETTE_OFFSET 6
#define V1_FIRST_LOOP_OFFSET 8
#define V1_RLE 0x80 // run-length encode?
#define V1_RLE_BG 0x40 // background fill
#define V2_HEADER_SIZE 0
#define V2_BYTES_PER_LOOP 12
#define V2_BYTES_PER_CEL 13
#define V2_COPY_OF_LOOP 2
#define V2_CELS_NUM 4
#define V2_LOOP_OFFSET 14
#define NEXT_RUNLENGTH_BYTE(n) \
if (literal_pos == runlength_pos) \
literal_pos += n; \
runlength_pos += n;
#define NEXT_LITERAL_BYTE(n) \
if (literal_pos == runlength_pos) \
runlength_pos += n; \
literal_pos += n;
static int decompress_sci_view(int id, int loop, int cel, byte *resource, byte *dest, int mirrored, int pixmap_size, int size,
int runlength_pos, int literal_pos, int xl, int yl, int color_key) {
int writepos = mirrored ? xl : 0;
int linebase = 0;
// For some cels the RLE data ends at the last non-transparent pixel,
// so we initialize the whole pixmap to transparency first
memset(dest, color_key, pixmap_size);
while ((mirrored ? linebase < pixmap_size : writepos < pixmap_size) && literal_pos < size && runlength_pos < size) {
int op = resource[runlength_pos];
int bytes;
int readbytes = 0;
int color = 0;
NEXT_RUNLENGTH_BYTE(1);
if (op & V1_RLE) {
bytes = op & 0x3f;
op &= (V1_RLE | V1_RLE_BG);
readbytes = (op & V1_RLE_BG) ? 0 : 1;
} else {
readbytes = bytes = op & 0x3f;
op = 0;
}
assert(runlength_pos + readbytes <= size);
/*
if (writepos - bytes < 0) {
GFXWARN("View %02x:(%d/%d) describes more bytes than needed: %d/%d bytes at rel. offset 0x%04x\n",
id, loop, cel, writepos - bytes, pixmap_size, pos - 1);
bytes = pixmap_size - writepos;
}
*/
if (mirrored && op == V1_RLE) {
color = resource[literal_pos];
NEXT_LITERAL_BYTE(1);
}
assert(op || literal_pos + bytes <= size);
if (!mirrored && (writepos + bytes > pixmap_size)) {
GFXWARN("Writing out of bounds: %d bytes at %d > size %d\n", bytes, writepos, pixmap_size);
}
if (mirrored) {
while (bytes--) {
writepos--;
if (op) {
*(dest + writepos) = (op & V1_RLE_BG) ? color_key : color;
} else {
*(dest + writepos) = *(resource + literal_pos);
NEXT_LITERAL_BYTE(1);
}
if (writepos == linebase) {
writepos += 2 * xl;
linebase += xl;
}
}
} else {
if (op) {
if (op & V1_RLE_BG)
memset(dest + writepos, color_key, bytes);
else {
color = resource[literal_pos];
NEXT_LITERAL_BYTE(1);
memset(dest + writepos, color, bytes);
}
} else {
memcpy(dest + writepos, resource + literal_pos, bytes);
NEXT_LITERAL_BYTE(bytes);
}
writepos += bytes;
}
}
return 0;
}
static int decompress_sci_view_amiga(int id, int loop, int cel, byte *resource, byte *dest, int mirrored, int pixmap_size, int size,
int pos, int xl, int yl, int color_key) {
int writepos = mirrored ? xl - 1 : 0;
while (writepos < pixmap_size && pos < size) {
int op = resource[pos++];
int bytes = (op & 0x07) ? op & 0x07 : op >> 3;
int color = (op & 0x07) ? op >> 3 : color_key;
if (mirrored) {
while (bytes--) {
dest[writepos--] = color;
// If we've just written the first pixel of a line...
if (!((writepos + 1) % xl)) {
// Then move to the end of next line
writepos += 2 * xl;
if (writepos >= pixmap_size && bytes) {
GFXWARN("View %02x:(%d/%d) writing out of bounds\n", id, loop, cel);
break;
}
}
}
} else {
if (writepos + bytes > pixmap_size) {
GFXWARN("View %02x:(%d/%d) describes more bytes than needed: %d/%d bytes at rel. offset 0x%04x\n",
id, loop, cel, writepos - bytes, pixmap_size, pos - 1);
bytes = pixmap_size - writepos;
}
memset(dest + writepos, color, bytes);
writepos += bytes;
}
}
if (writepos < pixmap_size) {
GFXWARN("View %02x:(%d/%d) not enough pixel data in view\n", id, loop, cel);
return 1;
}
return 0;
}
gfx_pixmap_t *gfxr_draw_cel1(int id, int loop, int cel, int mirrored, byte *resource, byte *cel_base, int size, gfxr_view_t *view, bool isAmiga, bool isSci11) {
int xl = READ_LE_UINT16(cel_base);
int yl = READ_LE_UINT16(cel_base + 2);
int pixmap_size = xl * yl;
int xdisplace = isSci11 ? READ_LE_UINT16(cel_base + 4) : (int8) cel_base[4];
int ydisplace = isSci11 ? READ_LE_UINT16(cel_base + 6) : (uint8) cel_base[5];
int runlength_offset = isSci11 ? READ_LE_UINT16(cel_base + 24) : 8;
int literal_offset = isSci11 ? READ_LE_UINT16(cel_base + 28) : 8;
gfx_pixmap_t *retval = gfx_pixmap_alloc_index_data(gfx_new_pixmap(xl, yl, id, loop, cel));
byte *dest = retval->index_data;
int decompress_failed;
retval->color_key = cel_base[isSci11 ? 8 : 6];
retval->xoffset = (mirrored) ? xdisplace : -xdisplace;
retval->yoffset = -ydisplace;
// FIXME: In LSL5, it seems that the inventory has views without palettes (or we don't load palettes properly)
retval->palette = (view && view->palette) ? view->palette->getref() : NULL;
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 (!isAmiga)
decompress_failed = decompress_sci_view(id, loop, cel, resource, dest, mirrored, pixmap_size, size, runlength_offset,
literal_offset, xl, yl, retval->color_key);
else
decompress_failed = decompress_sci_view_amiga(id, loop, cel, resource, dest, mirrored, pixmap_size, size, runlength_offset,
xl, yl, retval->color_key);
if (decompress_failed) {
gfx_free_pixmap(retval);
return NULL;
}
return retval;
}
gfxr_view_t *gfxr_draw_view1(int id, byte *resource, int size, Palette *static_pal, bool isSci11) {
uint16 palOffset = READ_LE_UINT16(resource + V1_PALETTE_OFFSET + (isSci11 ? 2 : 0));
uint16 headerSize = isSci11 ? READ_LE_UINT16(resource + V2_HEADER_SIZE) : 0;
byte* seeker = resource + headerSize;
uint16 loopOffset = 0;
int amiga_game = 0;
gfxr_view_t *view = (gfxr_view_t *)malloc(sizeof(gfxr_view_t));
view->ID = id;
view->flags = 0;
view->loops_nr = READ_LE_UINT16(resource + V1_LOOPS_NR_OFFSET + (isSci11 ? 2 : 0)) & 0xFF;
if (palOffset > 0) {
if (!isSci11)
view->palette = gfxr_read_pal1(id, resource + palOffset, size - palOffset);
else
view->palette = gfxr_read_pal11(id, resource + palOffset, size - palOffset);
} else if (static_pal && static_pal->size() == GFX_SCI1_AMIGA_COLORS_NR) {
// Assume we're running an amiga game.
amiga_game = 1;
view->palette = static_pal->getref();
} else {
view->palette = NULL;
}
view->loops = (gfxr_loop_t *)calloc(view->loops_nr, sizeof(gfxr_loop_t));
for (int i = 0; i < view->loops_nr; i++) {
if (!isSci11) {
bool mirrored = READ_LE_UINT16(resource + V1_MIRROR_MASK) & (1 << i);
loopOffset = READ_LE_UINT16(resource + V1_FIRST_LOOP_OFFSET + (i << 1));
view->loops[i].cels_nr = READ_LE_UINT16(resource + loopOffset);
view->loops[i].cels = (gfx_pixmap_t**)calloc(view->loops[i].cels_nr, sizeof(gfx_pixmap_t *));
for (int j = 0; j < view->loops[i].cels_nr; j++) {
int cel_offset = READ_LE_UINT16(resource + loopOffset + 4 + (j << 1));
view->loops[i].cels[j] = gfxr_draw_cel1(id, i, j, mirrored,
resource + cel_offset,
resource + cel_offset,
size - cel_offset,
view, amiga_game, false);
}
} else {
byte copy_entry = seeker[V2_COPY_OF_LOOP];
bool mirrored = (copy_entry != 255);
byte *buf = !mirrored ? seeker : resource + headerSize + copy_entry * resource[V2_BYTES_PER_LOOP];
loopOffset = READ_LE_UINT16(buf + V2_LOOP_OFFSET);
view->loops[i].cels_nr = buf[V2_CELS_NUM];
view->loops[i].cels = (gfx_pixmap_t**)calloc(view->loops[i].cels_nr, sizeof(gfx_pixmap_t *));
byte* cellSeeker = resource + loopOffset;
for (int j = 0; j < view->loops[i].cels_nr; j++) {
view->loops[i].cels[j] = gfxr_draw_cel1(id, i, j, mirrored, resource, cellSeeker, size, view, 0, true);
cellSeeker += resource[V2_BYTES_PER_CEL];
}
seeker += resource[V2_BYTES_PER_LOOP];
}
}
return view;
}
} // End of namespace Sci
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