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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.
*
* $URL$
* $Id$
*
*/
/* Required defines:
** FUNCNAME: Function name
** SIZETYPE: Type used for each pixel
*/
#include "sci/gfx/gfx_system.h"
#include "sci/gfx/gfx_resource.h"
#include "sci/gfx/gfx_tools.h"
namespace Sci {
// TODO: Replace this code with our common scalers (/graphics/scaler.h)
static void _gfx_xlate_pixmap_unfiltered(gfx_mode_t *mode, gfx_pixmap_t *pxm, int scale) {
byte result_colors[GFX_PIC_COLORS];
int scaleFactor = (scale) ? mode->scaleFactor : 1;
int widthc, heightc; // Width duplication counter
int line_width = scaleFactor * pxm->index_width;
int x, y;
int i;
byte byte_transparent = 0;
byte byte_opaque = 255;
byte *src = pxm->index_data;
byte *dest = pxm->data;
byte *alpha_dest = pxm->alpha_map;
int using_alpha = pxm->color_key != GFX_PIXMAP_COLOR_KEY_NONE;
int separate_alpha_map = using_alpha;
if (separate_alpha_map && !alpha_dest)
alpha_dest = pxm->alpha_map = (byte *)malloc(pxm->index_width * scaleFactor * pxm->index_height * scaleFactor);
// Calculate all colors
for (i = 0; i < pxm->colors_nr(); i++)
result_colors[i] = pxm->palette->getColor(i).parent_index;
if (!separate_alpha_map && pxm->color_key != GFX_PIXMAP_COLOR_KEY_NONE)
result_colors[pxm->color_key] = 0;
src = pxm->index_data; // Workaround for gcc 4.2.3 bug on EMT64
for (y = 0; y < pxm->index_height; y++) {
byte *prev_dest = dest;
byte *prev_alpha_dest = alpha_dest;
for (x = 0; x < pxm->index_width; x++) {
int isalpha;
byte col = result_colors[isalpha = *src++];
isalpha = (isalpha == pxm->color_key) && using_alpha;
// O(n) loops. There is an O(ln(n)) algorithm for this, but its slower for small n (which we're optimizing for here).
// And, anyway, most of the time is spent in memcpy() anyway.
for (widthc = 0; widthc < scaleFactor; widthc++) {
memcpy(dest, &col, 1);
dest++;
}
if (separate_alpha_map) { // Set separate alpha map
memset(alpha_dest, (isalpha) ? byte_transparent : byte_opaque, scaleFactor);
alpha_dest += scaleFactor;
}
}
// Copies each line. O(n) iterations; again, this could be optimized to O(ln(n)) for very high resolutions,
// but that wouldn't really help that much, as the same amount of data still would have to be transferred.
for (heightc = 1; heightc < scaleFactor; heightc++) {
memcpy(dest, prev_dest, line_width);
dest += line_width;
if (separate_alpha_map) {
memcpy(alpha_dest, prev_alpha_dest, line_width);
alpha_dest += line_width;
}
}
}
if (pxm->flags & GFX_PIXMAP_FLAG_SCALED_INDEX) {
pxm->width = pxm->index_width;
pxm->height = pxm->index_height;
} else {
pxm->width = pxm->index_width * mode->scaleFactor;
pxm->height = pxm->index_height * mode->scaleFactor;
}
}
void gfx_xlate_pixmap(gfx_pixmap_t *pxm, gfx_mode_t *mode) {
if (pxm->palette && pxm->palette != mode->palette)
pxm->palette->mergeInto(mode->palette);
if (!pxm->data) {
pxm->data = (byte*)malloc(mode->scaleFactor * mode->scaleFactor * pxm->index_width * pxm->index_height + 1);
// +1: Eases coying on BE machines in 24 bpp packed mode
// Assume that memory, if allocated already, will be sufficient
// Allocate alpha map
if (pxm->colors_nr() < GFX_PIC_COLORS)
pxm->alpha_map = (byte*)malloc(mode->scaleFactor * mode->scaleFactor * pxm->index_width * pxm->index_height + 1);
}
_gfx_xlate_pixmap_unfiltered(mode, pxm, !(pxm->flags & GFX_PIXMAP_FLAG_SCALED_INDEX));
if (pxm->palette)
pxm->palette_revision = pxm->palette->getRevision();
}
} // End of namespace Sci
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