mirror of
https://github.com/libretro/scummvm.git
synced 2025-04-11 03:01:01 +00:00
137 lines
4.3 KiB
C++
137 lines
4.3 KiB
C++
/* ResidualVM - A 3D game interpreter
|
|
*
|
|
* ResidualVM is the legal property of its developers, whose names
|
|
* are too numerous to list here. Please refer to the AUTHORS
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* This file is based on, or a modified version of code from TinyGL (C) 1997-1998 Fabrice Bellard,
|
|
* which is licensed under the zlib-license (see LICENSE).
|
|
* It also has modifications by the ResidualVM-team, which are covered under the GPLv2 (or later).
|
|
*/
|
|
|
|
#include "graphics/tinygl/zgl.h"
|
|
|
|
namespace TinyGL {
|
|
|
|
// linear interpolation with xf, yf normalized to 2^16
|
|
|
|
#define INTERP_NORM_BITS 16
|
|
#define INTERP_NORM (1 << INTERP_NORM_BITS)
|
|
|
|
static inline int interpolate(int v00, int v01, int v10, int xf, int yf) {
|
|
return v00 + (((v01 - v00) * xf + (v10 - v00) * yf) >> INTERP_NORM_BITS);
|
|
}
|
|
|
|
// TODO: more accurate resampling
|
|
|
|
void gl_resizeImage(Graphics::PixelBuffer &dest, int xsize_dest, int ysize_dest,
|
|
const Graphics::PixelBuffer &src, int xsize_src, int ysize_src) {
|
|
int point1_offset, point2_offset, point3_offset, dest_offset = 0;
|
|
int point_y_offset, point_offset;
|
|
float x1, y1, x1inc, y1inc;
|
|
int xi, yi, xf, yf, curr_yf;
|
|
bool space_below, space_right;
|
|
uint8 r00, g00, b00, a00;
|
|
uint8 r01, g01, b01, a01;
|
|
uint8 r10, g10, b10, a10;
|
|
|
|
x1inc = (float)(xsize_src - 1) / (float)(xsize_dest - 1);
|
|
y1inc = (float)(ysize_src - 1) / (float)(ysize_dest - 1);
|
|
|
|
y1 = 0;
|
|
for (int y = 0; y < ysize_dest; y++) {
|
|
x1 = 0;
|
|
yi = (int)floorf(y1);
|
|
yf = (int)((y1 - yi) * INTERP_NORM);
|
|
point_y_offset = yi * xsize_src;
|
|
space_below = (yi + 1) < ysize_src;
|
|
for (int x = 0; x < xsize_dest; x++) {
|
|
xi = (int)floorf(x1);
|
|
xf = (int)((x1 - xi) * INTERP_NORM);
|
|
point1_offset = point_offset = point_y_offset + xi;
|
|
space_right = (xi + 1) < xsize_src;
|
|
if ((xf + yf) <= INTERP_NORM) {
|
|
curr_yf = yf;
|
|
if (space_right)
|
|
point2_offset = point_offset + 1;
|
|
else
|
|
point2_offset = point_offset;
|
|
if (space_below)
|
|
point3_offset = point_offset + xsize_src;
|
|
else
|
|
point3_offset = point_offset;
|
|
} else {
|
|
xf = INTERP_NORM - xf;
|
|
curr_yf = INTERP_NORM - yf;
|
|
if (space_right) {
|
|
point1_offset += 1;
|
|
point3_offset = point_offset + 1;
|
|
} else
|
|
point3_offset = point_offset;
|
|
if (space_below) {
|
|
point1_offset += xsize_src;
|
|
point2_offset = point_offset + xsize_src;
|
|
} else
|
|
point2_offset = point_offset;
|
|
}
|
|
src.getARGBAt(point1_offset, r00, g00, b00, a00);
|
|
src.getARGBAt(point2_offset, r01, g01, b01, a01);
|
|
src.getARGBAt(point3_offset, r10, g10, b10, a10);
|
|
dest.setPixelAt(
|
|
dest_offset++,
|
|
interpolate(r00, r01, r10, xf, curr_yf),
|
|
interpolate(g00, g01, g10, xf, curr_yf),
|
|
interpolate(b00, b01, b10, xf, curr_yf),
|
|
interpolate(a00, a01, a10, xf, curr_yf)
|
|
);
|
|
x1 += x1inc;
|
|
}
|
|
y1 += y1inc;
|
|
}
|
|
}
|
|
|
|
#define FRAC_BITS 16
|
|
|
|
// resizing with no interlating nor nearest pixel
|
|
void gl_resizeImageNoInterpolate(Graphics::PixelBuffer &dest, int xsize_dest, int ysize_dest,
|
|
const Graphics::PixelBuffer &src, int xsize_src, int ysize_src) {
|
|
int dest_offset = 0;
|
|
int x1, y1, x1inc, y1inc;
|
|
int yi;
|
|
uint8 r, g, b, a;
|
|
|
|
x1inc = (int)((float)((xsize_src) << FRAC_BITS) / (float)(xsize_dest));
|
|
y1inc = (int)((float)((ysize_src) << FRAC_BITS) / (float)(ysize_dest));
|
|
|
|
y1 = 0;
|
|
for (int y = 0; y < ysize_dest; y++) {
|
|
yi = (y1 >> FRAC_BITS) * xsize_src;
|
|
x1 = 0;
|
|
for (int x = 0; x < xsize_dest; x++) {
|
|
src.getARGBAt(yi + (x1 >> FRAC_BITS), r, g, b, a);
|
|
dest.setPixelAt(dest_offset++, r, g, b, a);
|
|
x1 += x1inc;
|
|
}
|
|
y1 += y1inc;
|
|
}
|
|
}
|
|
|
|
} // end of namespace TinyGL
|