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/* Copyright (C) 2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** 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.
*/
#include "android/skin/scaler.h"
#include <stdint.h>
#include <math.h>
struct SkinScaler {
double scale;
double xdisp, ydisp;
double invscale;
int valid;
};
static SkinScaler _scaler0;
SkinScaler*
skin_scaler_create( void )
{
_scaler0.scale = 1.0;
_scaler0.xdisp = 0.0;
_scaler0.ydisp = 0.0;
_scaler0.invscale = 1.0;
return &_scaler0;
}
/* change the scale of a given scaler. returns 0 on success, or -1 in case of
* problem (unsupported scale) */
int
skin_scaler_set( SkinScaler* scaler, double scale, double xdisp, double ydisp )
{
/* right now, we only support scales in the 0.5 .. 1.0 range */
if (scale < 0.1)
scale = 0.1;
else if (scale > 6.0)
scale = 6.0;
scaler->scale = scale;
scaler->xdisp = xdisp;
scaler->ydisp = ydisp;
scaler->invscale = 1/scale;
scaler->valid = 1;
return 0;
}
void
skin_scaler_free( SkinScaler* scaler )
{
scaler=scaler;
}
typedef struct {
SDL_Rect rd; /* destination rectangle */
int sx, sy; /* source start position in 16.16 format */
int ix, iy; /* source increments in 16.16 format */
int src_pitch;
int src_w;
int src_h;
int dst_pitch;
uint8_t* dst_line;
uint8_t* src_line;
double scale;
} ScaleOp;
#define ARGB_SCALE_GENERIC scale_generic
#define ARGB_SCALE_05_TO_10 scale_05_to_10
#define ARGB_SCALE_UP_BILINEAR scale_up_bilinear
#define ARGB_SCALE_UP_QUICK_4x4 scale_up_quick_4x4
#include "android/skin/argb.h"
void
skin_scaler_scale( SkinScaler* scaler,
SDL_Surface* dst_surface,
SDL_Surface* src_surface,
int sx,
int sy,
int sw,
int sh )
{
ScaleOp op;
if ( !scaler->valid )
return;
SDL_LockSurface( src_surface );
SDL_LockSurface( dst_surface );
{
op.scale = scaler->scale;
op.src_pitch = src_surface->pitch;
op.src_line = src_surface->pixels;
op.src_w = src_surface->w;
op.src_h = src_surface->h;
op.dst_pitch = dst_surface->pitch;
op.dst_line = dst_surface->pixels;
/* compute the destination rectangle */
op.rd.x = (int)(sx * scaler->scale + scaler->xdisp);
op.rd.y = (int)(sy * scaler->scale + scaler->ydisp);
op.rd.w = (int)(ceil((sx + sw) * scaler->scale + scaler->xdisp)) - op.rd.x;
op.rd.h = (int)(ceil((sy + sh) * scaler->scale + scaler->ydisp)) - op.rd.y;
/* compute the starting source position in 16.16 format
* and the corresponding increments */
op.sx = (int)((op.rd.x - scaler->xdisp) * scaler->invscale * 65536);
op.sy = (int)((op.rd.y - scaler->ydisp) * scaler->invscale * 65536);
op.ix = (int)( scaler->invscale * 65536 );
op.iy = op.ix;
op.dst_line += op.rd.x*4 + op.rd.y*op.dst_pitch;
if (op.scale >= 0.5 && op.scale <= 1.0)
scale_05_to_10( &op );
else if (op.scale > 1.0)
scale_up_bilinear( &op );
else
scale_generic( &op );
}
SDL_UnlockSurface( dst_surface );
SDL_UnlockSurface( src_surface );
SDL_UpdateRects( dst_surface, 1, &op.rd );
}
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