mirror of
https://github.com/xemu-project/xemu.git
synced 2024-12-05 10:16:50 +00:00
cc69bda6c9
Careless use of malloc(): allocate Uint32[N], assign to int *, use int[N]. Fix by converting to g_new(). Functions can't fail anymore, so make them return void. Caller ignored the value anyway. Signed-off-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
220 lines
6.9 KiB
C
220 lines
6.9 KiB
C
/*
|
|
* SDL_zoom_template - surface scaling
|
|
*
|
|
* Copyright (c) 2009 Citrix Systems, Inc.
|
|
*
|
|
* Derived from: SDL_rotozoom, LGPL (c) A. Schiffler from the SDL_gfx library.
|
|
* Modifications by Stefano Stabellini.
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL version 2.
|
|
* See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#if BPP == 16
|
|
#define SDL_TYPE Uint16
|
|
#elif BPP == 32
|
|
#define SDL_TYPE Uint32
|
|
#else
|
|
#error unsupport depth
|
|
#endif
|
|
|
|
/*
|
|
* Simple helper functions to make the code looks nicer
|
|
*
|
|
* Assume spf = source SDL_PixelFormat
|
|
* dpf = dest SDL_PixelFormat
|
|
*
|
|
*/
|
|
#define getRed(color) (((color) & spf->Rmask) >> spf->Rshift)
|
|
#define getGreen(color) (((color) & spf->Gmask) >> spf->Gshift)
|
|
#define getBlue(color) (((color) & spf->Bmask) >> spf->Bshift)
|
|
#define getAlpha(color) (((color) & spf->Amask) >> spf->Ashift)
|
|
|
|
#define setRed(r, pcolor) do { \
|
|
*pcolor = ((*pcolor) & (~(dpf->Rmask))) + \
|
|
(((r) & (dpf->Rmask >> dpf->Rshift)) << dpf->Rshift); \
|
|
} while (0);
|
|
|
|
#define setGreen(g, pcolor) do { \
|
|
*pcolor = ((*pcolor) & (~(dpf->Gmask))) + \
|
|
(((g) & (dpf->Gmask >> dpf->Gshift)) << dpf->Gshift); \
|
|
} while (0);
|
|
|
|
#define setBlue(b, pcolor) do { \
|
|
*pcolor = ((*pcolor) & (~(dpf->Bmask))) + \
|
|
(((b) & (dpf->Bmask >> dpf->Bshift)) << dpf->Bshift); \
|
|
} while (0);
|
|
|
|
#define setAlpha(a, pcolor) do { \
|
|
*pcolor = ((*pcolor) & (~(dpf->Amask))) + \
|
|
(((a) & (dpf->Amask >> dpf->Ashift)) << dpf->Ashift); \
|
|
} while (0);
|
|
|
|
static void glue(sdl_zoom_rgb, BPP)(SDL_Surface *src, SDL_Surface *dst, int smooth,
|
|
SDL_Rect *dst_rect)
|
|
{
|
|
int x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy, ex, ey, t1, t2, sstep, sstep_jump;
|
|
SDL_TYPE *c00, *c01, *c10, *c11, *sp, *csp, *dp;
|
|
int d_gap;
|
|
SDL_PixelFormat *spf = src->format;
|
|
SDL_PixelFormat *dpf = dst->format;
|
|
|
|
if (smooth) {
|
|
/* For interpolation: assume source dimension is one pixel.
|
|
* Smaller here to avoid overflow on right and bottom edge.
|
|
*/
|
|
sx = (int) (65536.0 * (float) (src->w - 1) / (float) dst->w);
|
|
sy = (int) (65536.0 * (float) (src->h - 1) / (float) dst->h);
|
|
} else {
|
|
sx = (int) (65536.0 * (float) src->w / (float) dst->w);
|
|
sy = (int) (65536.0 * (float) src->h / (float) dst->h);
|
|
}
|
|
|
|
sax = g_new(int, dst->w + 1);
|
|
say = g_new(int, dst->h + 1);
|
|
|
|
sp = csp = (SDL_TYPE *) src->pixels;
|
|
dp = (SDL_TYPE *) (dst->pixels + dst_rect->y * dst->pitch +
|
|
dst_rect->x * dst->format->BytesPerPixel);
|
|
|
|
csx = 0;
|
|
csax = sax;
|
|
for (x = 0; x <= dst->w; x++) {
|
|
*csax = csx;
|
|
csax++;
|
|
csx &= 0xffff;
|
|
csx += sx;
|
|
}
|
|
csy = 0;
|
|
csay = say;
|
|
for (y = 0; y <= dst->h; y++) {
|
|
*csay = csy;
|
|
csay++;
|
|
csy &= 0xffff;
|
|
csy += sy;
|
|
}
|
|
|
|
d_gap = dst->pitch - dst_rect->w * dst->format->BytesPerPixel;
|
|
|
|
if (smooth) {
|
|
csay = say;
|
|
for (y = 0; y < dst_rect->y; y++) {
|
|
csay++;
|
|
sstep = (*csay >> 16) * src->pitch;
|
|
csp = (SDL_TYPE *) ((Uint8 *) csp + sstep);
|
|
}
|
|
|
|
/* Calculate sstep_jump */
|
|
csax = sax;
|
|
sstep_jump = 0;
|
|
for (x = 0; x < dst_rect->x; x++) {
|
|
csax++;
|
|
sstep = (*csax >> 16);
|
|
sstep_jump += sstep;
|
|
}
|
|
|
|
for (y = 0; y < dst_rect->h ; y++) {
|
|
/* Setup colour source pointers */
|
|
c00 = csp + sstep_jump;
|
|
c01 = c00 + 1;
|
|
c10 = (SDL_TYPE *) ((Uint8 *) csp + src->pitch) + sstep_jump;
|
|
c11 = c10 + 1;
|
|
csax = sax + dst_rect->x;
|
|
|
|
for (x = 0; x < dst_rect->w; x++) {
|
|
|
|
/* Interpolate colours */
|
|
ex = (*csax & 0xffff);
|
|
ey = (*csay & 0xffff);
|
|
t1 = ((((getRed(*c01) - getRed(*c00)) * ex) >> 16) +
|
|
getRed(*c00)) & (dpf->Rmask >> dpf->Rshift);
|
|
t2 = ((((getRed(*c11) - getRed(*c10)) * ex) >> 16) +
|
|
getRed(*c10)) & (dpf->Rmask >> dpf->Rshift);
|
|
setRed((((t2 - t1) * ey) >> 16) + t1, dp);
|
|
t1 = ((((getGreen(*c01) - getGreen(*c00)) * ex) >> 16) +
|
|
getGreen(*c00)) & (dpf->Gmask >> dpf->Gshift);
|
|
t2 = ((((getGreen(*c11) - getGreen(*c10)) * ex) >> 16) +
|
|
getGreen(*c10)) & (dpf->Gmask >> dpf->Gshift);
|
|
setGreen((((t2 - t1) * ey) >> 16) + t1, dp);
|
|
t1 = ((((getBlue(*c01) - getBlue(*c00)) * ex) >> 16) +
|
|
getBlue(*c00)) & (dpf->Bmask >> dpf->Bshift);
|
|
t2 = ((((getBlue(*c11) - getBlue(*c10)) * ex) >> 16) +
|
|
getBlue(*c10)) & (dpf->Bmask >> dpf->Bshift);
|
|
setBlue((((t2 - t1) * ey) >> 16) + t1, dp);
|
|
t1 = ((((getAlpha(*c01) - getAlpha(*c00)) * ex) >> 16) +
|
|
getAlpha(*c00)) & (dpf->Amask >> dpf->Ashift);
|
|
t2 = ((((getAlpha(*c11) - getAlpha(*c10)) * ex) >> 16) +
|
|
getAlpha(*c10)) & (dpf->Amask >> dpf->Ashift);
|
|
setAlpha((((t2 - t1) * ey) >> 16) + t1, dp);
|
|
|
|
/* Advance source pointers */
|
|
csax++;
|
|
sstep = (*csax >> 16);
|
|
c00 += sstep;
|
|
c01 += sstep;
|
|
c10 += sstep;
|
|
c11 += sstep;
|
|
/* Advance destination pointer */
|
|
dp++;
|
|
}
|
|
/* Advance source pointer */
|
|
csay++;
|
|
csp = (SDL_TYPE *) ((Uint8 *) csp + (*csay >> 16) * src->pitch);
|
|
/* Advance destination pointers */
|
|
dp = (SDL_TYPE *) ((Uint8 *) dp + d_gap);
|
|
}
|
|
|
|
|
|
} else {
|
|
csay = say;
|
|
|
|
for (y = 0; y < dst_rect->y; y++) {
|
|
csay++;
|
|
sstep = (*csay >> 16) * src->pitch;
|
|
csp = (SDL_TYPE *) ((Uint8 *) csp + sstep);
|
|
}
|
|
|
|
/* Calculate sstep_jump */
|
|
csax = sax;
|
|
sstep_jump = 0;
|
|
for (x = 0; x < dst_rect->x; x++) {
|
|
csax++;
|
|
sstep = (*csax >> 16);
|
|
sstep_jump += sstep;
|
|
}
|
|
|
|
for (y = 0 ; y < dst_rect->h ; y++) {
|
|
sp = csp + sstep_jump;
|
|
csax = sax + dst_rect->x;
|
|
|
|
for (x = 0; x < dst_rect->w; x++) {
|
|
|
|
/* Draw */
|
|
*dp = *sp;
|
|
|
|
/* Advance source pointers */
|
|
csax++;
|
|
sstep = (*csax >> 16);
|
|
sp += sstep;
|
|
|
|
/* Advance destination pointer */
|
|
dp++;
|
|
}
|
|
/* Advance source pointers */
|
|
csay++;
|
|
sstep = (*csay >> 16) * src->pitch;
|
|
csp = (SDL_TYPE *) ((Uint8 *) csp + sstep);
|
|
|
|
/* Advance destination pointer */
|
|
dp = (SDL_TYPE *) ((Uint8 *) dp + d_gap);
|
|
}
|
|
}
|
|
|
|
g_free(sax);
|
|
g_free(say);
|
|
}
|
|
|
|
#undef SDL_TYPE
|
|
|