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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.
*
* $URL$
* $Id$
*
*/
// Conversion routines for planar graphics in Amiga versions
#include "agos/agos.h"
#include "agos/intern.h"
namespace AGOS {
enum {
kMaxColorDepth = 5
};
static void uncompressPlane(const byte *plane, byte *outptr, int length) {
while (length != 0) {
int wordlen;
signed char x = *plane++;
if (x >= 0) {
wordlen = MIN<int>(x + 1, length);
uint16 w = READ_UINT16(plane); plane += 2;
for (int i = 0; i < wordlen; ++i) {
WRITE_UINT16(outptr, w); outptr += 2;
}
} else {
wordlen = MIN<int>(-x, length);
memcpy(outptr, plane, wordlen * 2);
outptr += wordlen * 2;
plane += wordlen * 2;
}
length -= wordlen;
}
}
static void bitplaneToChunky(uint16 *w, uint8 colorDepth, uint8 *&dst) {
for (int j = 0; j < 8; j++) {
byte color1 = 0;
byte color2 = 0;
for (int p = 0; p < colorDepth; ++p) {
if (w[p] & 0x8000) {
color1 |= 1 << p;
}
if (w[p] & 0x4000) {
color2 |= 1 << p;
}
w[p] <<= 2;
}
if (colorDepth > 4) {
*dst++ = color1;
*dst++ = color2;
} else {
*dst++ = (color1 << 4) | color2;
}
}
}
static void bitplaneToChunkyText(uint16 *w, uint8 colorDepth, uint8 *&dst) {
for (int j = 0; j < 16; j++) {
byte color = 0;
for (int p = 0; p < colorDepth; ++p) {
if (w[p] & 0x8000) {
color |= 1 << p;
}
w[p] <<= 1;
}
if (color)
color |= 0xC0;
*dst++ = color;
}
}
static void convertCompressedImage(const byte *src, byte *dst, uint8 colorDepth, int height, int width) {
const byte *plane[kMaxColorDepth];
byte *uncptr[kMaxColorDepth];
int length, i, j;
byte *uncbfrout = (byte *)malloc(width * height);
length = (width + 15) / 16 * height;
for (i = 0; i < colorDepth; ++i) {
plane[i] = src + READ_BE_UINT16(src + i * 4) + READ_BE_UINT16(src + i * 4 + 2);
uncptr[i] = (uint8 *)malloc(length * 2);
uncompressPlane(plane[i], uncptr[i], length);
plane[i] = uncptr[i];
}
byte *uncbfroutptr = uncbfrout;
for (i = 0; i < length; ++i) {
uint16 w[kMaxColorDepth];
for (j = 0; j < colorDepth; ++j) {
w[j] = READ_BE_UINT16(plane[j]); plane[j] += 2;
}
bitplaneToChunky(w, colorDepth, uncbfroutptr);
}
uncbfroutptr = uncbfrout;
const int chunkSize = colorDepth > 4 ? 16 : 8;
for (i = 0; i < width / 16; ++i) {
for (j = 0; j < height; ++j) {
memcpy(dst + width * chunkSize / 16 * j + chunkSize * i, uncbfroutptr, chunkSize);
uncbfroutptr += chunkSize;
}
}
free(uncbfrout);
for (i = 0; i < colorDepth; ++i) {
free(uncptr[i]);
}
}
byte *AGOSEngine::convertImage(VC10_state *state, bool compressed) {
int length, i, j;
uint8 colorDepth = 4;
if (getGameType() == GType_SIMON1) {
if (((_lockWord & 0x20) && !state->palette) || ((getFeatures() & GF_32COLOR) &&
state->palette != 0xC0)) {
colorDepth = 5;
}
}
const byte *src = state->srcPtr;
int width = state->width * 16;
int height = state->height;
free(_planarBuf);
_planarBuf = (byte *)malloc(width * height);
byte *dst = _planarBuf;
if (compressed) {
convertCompressedImage(src, dst, colorDepth, height, width);
} else {
length = (width + 15) / 16 * height;
for (i = 0; i < length; i++) {
uint16 w[kMaxColorDepth];
if (getGameType() == GType_SIMON1 && colorDepth == 4) {
for (j = 0; j < colorDepth; ++j) {
w[j] = READ_BE_UINT16(src + j * length * 2);
}
if (state->palette == 0xC0) {
bitplaneToChunkyText(w, colorDepth, dst);
} else {
bitplaneToChunky(w, colorDepth, dst);
}
src += 2;
} else {
for (j = 0; j < colorDepth; ++j) {
w[j] = READ_BE_UINT16(src); src += 2;
}
bitplaneToChunky(w, colorDepth, dst);
}
}
}
return _planarBuf;
}
} // End of namespace AGOS
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