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rotozoom!

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This commit is contained in:
Albert Fabregat 2002-09-29 11:18:52 +00:00
parent dd9f7ef627
commit bb089ddf35
3 changed files with 1423 additions and 0 deletions
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902
ediv/src/dlls/graphics/SDL_rotozoom.c Normal file
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/*
SDL_rotozoom.c
Copyright (C) A. Schiffler, July 2001
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef WIN32
#include <windows.h>
#endif
#include <stdlib.h>
#include <string.h>
#include "SDL_rotozoom.h"
#define MAX(a,b) (((a) > (b)) ? (a) : (b))
/*
32bit Zoomer with optional anti-aliasing by bilinear interpolation.
Zoomes 32bit RGBA/ABGR 'src' surface to 'dst' surface.
*/
int
zoomSurfaceRGBA (SDL_Surface * src, SDL_Surface * dst, int smooth)
{
int x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy, ex, ey, t1, t2, sstep;
tColorRGBA *c00, *c01, *c10, *c11;
tColorRGBA *sp, *csp, *dp;
int sgap, dgap, orderRGBA;
/* Variable setup */
if (smooth)
{
/* For interpolation: assume source dimension is one pixel */
/* smaller 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);
}
/* Allocate memory for row increments */
if ((sax = (int *) malloc ((dst->w + 1) * sizeof (Uint32))) == NULL)
{
return (-1);
}
if ((say = (int *) malloc ((dst->h + 1) * sizeof (Uint32))) == NULL)
{
free (sax);
return (-1);
}
/* Precalculate row increments */
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;
}
/* Pointer setup */
sp = csp = (tColorRGBA *) src->pixels;
dp = (tColorRGBA *) dst->pixels;
sgap = src->pitch - src->w * 4;
dgap = dst->pitch - dst->w * 4;
orderRGBA = (src->format->Rmask == 0x000000ff);
/* Switch between interpolating and non-interpolating code */
if (smooth)
{
/* Interpolating Zoom */
/* Scan destination */
csay = say;
for (y = 0; y < dst->h; y++)
{
/* Setup color source pointers */
c00 = csp;
c01 = csp;
c01++;
c10 = (tColorRGBA *) ((Uint8 *) csp + src->pitch);
c11 = c10;
c11++;
csax = sax;
for (x = 0; x < dst->w; x++)
{
/* ABGR ordering */
/* Interpolate colors */
ex = (*csax & 0xffff);
ey = (*csay & 0xffff);
t1 = ((((c01->r - c00->r) * ex) >> 16) + c00->r) & 0xff;
t2 = ((((c11->r - c10->r) * ex) >> 16) + c10->r) & 0xff;
dp->r = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01->g - c00->g) * ex) >> 16) + c00->g) & 0xff;
t2 = ((((c11->g - c10->g) * ex) >> 16) + c10->g) & 0xff;
dp->g = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01->b - c00->b) * ex) >> 16) + c00->b) & 0xff;
t2 = ((((c11->b - c10->b) * ex) >> 16) + c10->b) & 0xff;
dp->b = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01->a - c00->a) * ex) >> 16) + c00->a) & 0xff;
t2 = ((((c11->a - c10->a) * ex) >> 16) + c10->a) & 0xff;
dp->a = (((t2 - t1) * ey) >> 16) + t1;
/* Advance source pointers */
csax++;
sstep = (*csax >> 16);
c00 += sstep;
c01 += sstep;
c10 += sstep;
c11 += sstep;
/* Advance destination pointer */
dp++;
}
/* Advance source pointer */
csay++;
csp = (tColorRGBA *) ((Uint8 *) csp + (*csay >> 16) * src->pitch);
/* Advance destination pointers */
dp = (tColorRGBA *) ((Uint8 *) dp + dgap);
}
}
else
{
/* Non-Interpolating Zoom */
csay = say;
for (y = 0; y < dst->h; y++)
{
sp = csp;
csax = sax;
for (x = 0; x < dst->w; x++)
{
/* Draw */
*dp = *sp;
/* Advance source pointers */
csax++;
sp += (*csax >> 16);
/* Advance destination pointer */
dp++;
}
/* Advance source pointer */
csay++;
csp = (tColorRGBA *) ((Uint8 *) csp + (*csay >> 16) * src->pitch);
/* Advance destination pointers */
dp = (tColorRGBA *) ((Uint8 *) dp + dgap);
}
}
/* Remove temp arrays */
free (sax);
free (say);
return (0);
}
/*
8bit Zoomer without smoothing.
Zoomes 8bit palette/Y 'src' surface to 'dst' surface.
*/
int
zoomSurfaceY (SDL_Surface * src, SDL_Surface * dst)
{
Uint32 x, y, sx, sy, *sax, *say, *csax, *csay, csx, csy;
Uint8 *sp, *dp, *csp;
int dgap;
/* Variable setup */
sx = (Uint32) (65536.0 * (float) src->w / (float) dst->w);
sy = (Uint32) (65536.0 * (float) src->h / (float) dst->h);
/* Allocate memory for row increments */
if ((sax = (Uint32 *) malloc (dst->w * sizeof (Uint32))) == NULL)
{
return (-1);
}
if ((say = (Uint32 *) malloc (dst->h * sizeof (Uint32))) == NULL)
{
if (sax != NULL)
{
free (sax);
}
return (-1);
}
/* Precalculate row increments */
csx = 0;
csax = sax;
for (x = 0; x < dst->w; x++)
{
csx += sx;
*csax = (csx >> 16);
csx &= 0xffff;
csax++;
}
csy = 0;
csay = say;
for (y = 0; y < dst->h; y++)
{
csy += sy;
*csay = (csy >> 16);
csy &= 0xffff;
csay++;
}
csx = 0;
csax = sax;
for (x = 0; x < dst->w; x++)
{
csx += (*csax);
csax++;
}
csy = 0;
csay = say;
for (y = 0; y < dst->h; y++)
{
csy += (*csay);
csay++;
}
/* Pointer setup */
sp = csp = (Uint8 *) src->pixels;
dp = (Uint8 *) dst->pixels;
dgap = dst->pitch - dst->w;
/* Draw */
csay = say;
for (y = 0; y < dst->h; y++)
{
csax = sax;
sp = csp;
for (x = 0; x < dst->w; x++)
{
/* Draw */
*dp = *sp;
/* Advance source pointers */
sp += (*csax);
csax++;
/* Advance destination pointer */
dp++;
}
/* Advance source pointer (for row) */
csp += ((*csay) * src->pitch);
csay++;
/* Advance destination pointers */
dp += dgap;
}
/* Remove temp arrays */
free (sax);
free (say);
return (0);
}
/*
32bit Rotozoomer with optional anti-aliasing by bilinear interpolation.
Rotates and zoomes 32bit RGBA/ABGR 'src' surface to 'dst' surface.
*/
void
transformSurfaceRGBA (SDL_Surface * src, SDL_Surface * dst, int cx, int cy,
int isin, int icos, int smooth)
{
int x, y, t1, t2, dx, dy, xd, yd, sdx, sdy, ax, ay, ex, ey, sw, sh;
tColorRGBA c00, c01, c10, c11;
tColorRGBA *pc, *sp;
int gap, orderRGBA;
xd = ((src->w - dst->w) << 15);
yd = ((src->h - dst->h) << 15);
ax = (cx << 16) - (icos * cx);
ay = (cy << 16) - (isin * cx);
sw = src->w - 1;
sh = src->h - 1;
pc = dst->pixels;
gap = dst->pitch - dst->w * 4;
orderRGBA = (src->format->Rmask == 0x000000ff);
if (smooth)
{
for (y = 0; y < dst->h; y++)
{
dy = cy - y;
sdx = (ax + (isin * dy)) + xd;
sdy = (ay - (icos * dy)) + yd;
for (x = 0; x < dst->w; x++)
{
dx = (sdx >> 16);
dy = (sdy >> 16);
if ((dx >= -1) && (dy >= -1) && (dx < src->w) && (dy < src->h))
{
if ((dx >= 0) && (dy >= 0) && (dx < sw) && (dy < sh))
{
sp =
(tColorRGBA *) ((Uint8 *) src->pixels +
src->pitch * dy);
sp += dx;
c00 = *sp;
sp += 1;
c01 = *sp;
sp = (tColorRGBA *) ((Uint8 *) sp + src->pitch);
sp -= 1;
c10 = *sp;
sp += 1;
c11 = *sp;
}
else if ((dx == sw) && (dy == sh))
{
sp =
(tColorRGBA *) ((Uint8 *) src->pixels +
src->pitch * dy);
sp += dx;
c00 = *sp;
c01 = *pc;
c10 = *pc;
c11 = *pc;
}
else if ((dx == -1) && (dy == -1))
{
sp = (tColorRGBA *) (src->pixels);
c00 = *pc;
c01 = *pc;
c10 = *pc;
c11 = *sp;
}
else if ((dx == -1) && (dy == sh))
{
sp = (tColorRGBA *) (src->pixels);
sp =
(tColorRGBA *) ((Uint8 *) src->pixels +
src->pitch * dy);
c00 = *pc;
c01 = *sp;
c10 = *pc;
c11 = *pc;
}
else if ((dx == sw) && (dy == -1))
{
sp = (tColorRGBA *) (src->pixels);
sp += dx;
c00 = *pc;
c01 = *pc;
c10 = *sp;
c11 = *pc;
}
else if (dx == -1)
{
sp =
(tColorRGBA *) ((Uint8 *) src->pixels +
src->pitch * dy);
c00 = *pc;
c01 = *sp;
c10 = *pc;
sp = (tColorRGBA *) ((Uint8 *) sp + src->pitch);
c11 = *sp;
}
else if (dy == -1)
{
sp = (tColorRGBA *) (src->pixels);
sp += dx;
c00 = *pc;
c01 = *pc;
c10 = *sp;
sp += 1;
c11 = *sp;
}
else if (dx == sw)
{
sp =
(tColorRGBA *) ((Uint8 *) src->pixels +
src->pitch * dy);
sp += dx;
c00 = *sp;
c01 = *pc;
sp = (tColorRGBA *) ((Uint8 *) sp + src->pitch);
c10 = *sp;
c11 = *pc;
}
else if (dy == sh)
{
sp =
(tColorRGBA *) ((Uint8 *) src->pixels +
src->pitch * dy);
sp += dx;
c00 = *sp;
sp += 1;
c01 = *sp;
c10 = *pc;
c11 = *pc;
}
ex = (sdx & 0xffff);
ey = (sdy & 0xffff);
t1 = ((((c01.r - c00.r) * ex) >> 16) + c00.r) & 0xff;
t2 = ((((c11.r - c10.r) * ex) >> 16) + c10.r) & 0xff;
pc->r = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01.g - c00.g) * ex) >> 16) + c00.g) & 0xff;
t2 = ((((c11.g - c10.g) * ex) >> 16) + c10.g) & 0xff;
pc->g = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01.b - c00.b) * ex) >> 16) + c00.b) & 0xff;
t2 = ((((c11.b - c10.b) * ex) >> 16) + c10.b) & 0xff;
pc->b = (((t2 - t1) * ey) >> 16) + t1;
t1 = ((((c01.a - c00.a) * ex) >> 16) + c00.a) & 0xff;
t2 = ((((c11.a - c10.a) * ex) >> 16) + c10.a) & 0xff;
pc->a = (((t2 - t1) * ey) >> 16) + t1;
}
sdx += icos;
sdy += isin;
pc++;
}
pc = (tColorRGBA *) ((Uint8 *) pc + gap);
}
}
else
{
for (y = 0; y < dst->h; y++)
{
dy = cy - y;
sdx = (ax + (isin * dy)) + xd;
sdy = (ay - (icos * dy)) + yd;
for (x = 0; x < dst->w; x++)
{
dx = (short) (sdx >> 16);
dy = (short) (sdy >> 16);
if ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h))
{
sp =
(tColorRGBA *) ((Uint8 *) src->pixels + src->pitch * dy);
sp += dx;
*pc = *sp;
}
sdx += icos;
sdy += isin;
pc++;
}
pc = (tColorRGBA *) ((Uint8 *) pc + gap);
}
}
}
/*
8bit Rotozoomer without smoothing
Rotates and zoomes 8bit palette/Y 'src' surface to 'dst' surface.
*/
void
transformSurfaceY (SDL_Surface * src, SDL_Surface * dst, int cx, int cy,
int isin, int icos)
{
int x, y, dx, dy, xd, yd, sdx, sdy, ax, ay, sw, sh;
tColorY *pc, *sp;
int gap;
/* Variable setup */
xd = ((src->w - dst->w) << 15);
yd = ((src->h - dst->h) << 15);
ax = (cx << 16) - (icos * cx);
ay = (cy << 16) - (isin * cx);
sw = src->w - 1;
sh = src->h - 1;
pc = dst->pixels;
gap = dst->pitch - dst->w;
/* Clear surface to colorkey */
memset (pc, (unsigned char) (src->format->colorkey & 0xff),
dst->pitch * dst->h);
/* Iterate through destination surface */
for (y = 0; y < dst->h; y++)
{
dy = cy - y;
sdx = (ax + (isin * dy)) + xd;
sdy = (ay - (icos * dy)) + yd;
for (x = 0; x < dst->w; x++)
{
dx = (short) (sdx >> 16);
dy = (short) (sdy >> 16);
if ((dx >= 0) && (dy >= 0) && (dx < src->w) && (dy < src->h))
{
sp = (tColorY *) (src->pixels);
sp += (src->pitch * dy + dx);
*pc = *sp;
}
sdx += icos;
sdy += isin;
pc++;
}
pc += gap;
}
}
/*
rotozoomSurface()
Rotates and zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
'angle' is the rotation in degrees. 'zoom' a scaling factor. If 'smooth' is 1
then the destination 32bit surface is anti-aliased. If the surface is not 8bit
or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
*/
/*XPUT/* Sanity check */
/* Determine if source surface is 32bit or 8bit */
/* New source surface is 32bit with a defined RGBA ordering */
/* Sanity check zoom factor */
/* Check if we have a rotozoom or just a zoom */
/* Angle!=0: full rotozoom *
//* ----------------------- */
/* Calculate target factors from sin/cos and zoom
*/
/* Determine destination width and height by rotating a centered source box */
/* Alloc space to completely contain the rotated surface */
/* Target surface is 32bit with source RGBA/ABGR ordering */
/* Lock source surface */
/* Check which kind of surface we have */
/* Call the 32bit transformation routine to do the rotation (using alpha) */
#define VALUE_LIMIT 0.001
SDL_Surface *
rotozoomSurface (SDL_Surface * src, double angle, double zoom, int smooth)
{
SDL_Surface *rz_src;
SDL_Surface *rz_dst;
double zoominv;
double radangle, sanglezoom, canglezoom, sanglezoominv, canglezoominv;
int dstwidthhalf, dstwidth, dstheighthalf, dstheight;
double x, y, cx, cy, sx, sy;
int is32bit;
int i, src_converted;
if (src == NULL)
return (NULL);
is32bit = (src->format->BitsPerPixel == 32);
if ((is32bit) || (src->format->BitsPerPixel == 8))
{
rz_src = src;
src_converted = 0;
}
else
{
rz_src =
SDL_CreateRGBSurface (SDL_SWSURFACE, src->w, src->h, 32, 0x000000ff,
0x0000ff00, 0x00ff0000, 0xff000000);
SDL_BlitSurface (src, NULL, rz_src, NULL);
src_converted = 1;
is32bit = 1;
}
if (zoom < VALUE_LIMIT)
{
zoom = VALUE_LIMIT;
}
zoominv = 65536.0 / zoom;
if (fabs (angle) > VALUE_LIMIT)
{
radangle = angle * (M_PI / 180.0);
sanglezoom = sanglezoominv = sin (radangle);
canglezoom = canglezoominv = cos (radangle);
sanglezoom *= zoom;
canglezoom *= zoom;
sanglezoominv *= zoominv;
canglezoominv *= zoominv;
x = rz_src->w / 2;
y = rz_src->h / 2;
cx = canglezoom * x;
cy = canglezoom * y;
sx = sanglezoom * x;
sy = sanglezoom * y;
dstwidthhalf = src->w;
dstheighthalf = src->h;
/*dstwidthhalf =MAX ((int)
ceil (MAX
(MAX
(MAX (fabs (cx + sy), fabs (cx - sy)), fabs (-cx + sy)),
fabs (-cx - sy))), 1);
dstheighthalf = MAX ((int) ceil (MAX (MAX (MAX (fabs (sx + cy), fabs (sx - cy)), fabs (-sx + cy)),fabs (-sx - cy))), 1);
*/
dstwidth = 2 * dstwidthhalf;
dstheight = 2 * dstheighthalf;
rz_dst = NULL;
if (is32bit)
{
rz_dst =
SDL_CreateRGBSurface (SDL_SWSURFACE, dstwidth, dstheight, 32,
rz_src->format->Rmask,
rz_src->format->Gmask,
rz_src->format->Bmask,
rz_src->format->Amask);
}
else
{
rz_dst =
SDL_CreateRGBSurface (SDL_SWSURFACE, dstwidth, dstheight, 8, 0, 0,
0, 0);
}
SDL_LockSurface (rz_src);
if (is32bit)
{
transformSurfaceRGBA (rz_src, rz_dst, dstwidthhalf, dstheighthalf,
(int) (sanglezoominv),
(int) (canglezoominv), smooth);
SDL_SetAlpha (rz_dst, SDL_SRCALPHA, 255);
}
else
{
for (i = 0; i < rz_src->format->palette->ncolors; i++)
{
rz_dst->format->palette->colors[i] =
rz_src->format->palette->colors[i];
}
rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
transformSurfaceY (rz_src, rz_dst, dstwidthhalf, dstheighthalf,
(int) (sanglezoominv), (int) (canglezoominv));
SDL_SetColorKey (rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL,
rz_src->format->colorkey);
}
SDL_UnlockSurface (rz_src);
}
else
{
dstwidth = (int) ((double) rz_src->w * zoom);
dstheight = (int) ((double) rz_src->h * zoom);
if (dstwidth < 1)
{
dstwidth = 1;
}
if (dstheight < 1)
{
dstheight = 1;
}
rz_dst = NULL;
if (is32bit)
{
rz_dst =
SDL_CreateRGBSurface (SDL_SWSURFACE, dstwidth, dstheight, 32,
rz_src->format->Rmask,
rz_src->format->Gmask,
rz_src->format->Bmask,
rz_src->format->Amask);
}
else
{
rz_dst =
SDL_CreateRGBSurface (SDL_SWSURFACE, dstwidth, dstheight, 8, 0, 0,
0, 0);
}
SDL_LockSurface (rz_src);
if (is32bit)
{
zoomSurfaceRGBA (rz_src, rz_dst, smooth);
SDL_SetAlpha (rz_dst, SDL_SRCALPHA, 255);
}
else
{
for (i = 0; i < rz_src->format->palette->ncolors; i++)
{
rz_dst->format->palette->colors[i] =
rz_src->format->palette->colors[i];
}
rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
zoomSurfaceY (rz_src, rz_dst);
SDL_SetColorKey (rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL,
rz_src->format->colorkey);
}
SDL_UnlockSurface (rz_src);
}
if (src_converted)
{
SDL_FreeSurface (rz_src);
}
return (rz_dst);
}
/*
zoomSurface()
Zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
'zoomx' and 'zoomy' are scaling factors for width and height. If 'smooth' is 1
then the destination 32bit surface is anti-aliased. If the surface is not 8bit
or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
*/
#define VALUE_LIMIT 0.001
SDL_Surface *
zoomSurface (SDL_Surface * src, double zoomx, double zoomy, int smooth)
{
SDL_Surface *rz_src;
SDL_Surface *rz_dst;
int dstwidth, dstheight;
int is32bit;
int i, src_converted;
if (src == NULL)
return (NULL);
is32bit = (src->format->BitsPerPixel == 32);
if ((is32bit) || (src->format->BitsPerPixel == 8))
{
rz_src = src;
src_converted = 0;
}
else
{
rz_src =
SDL_CreateRGBSurface (SDL_SWSURFACE, src->w, src->h, 32, 0x000000ff,
0x0000ff00, 0x00ff0000, 0xff000000);
SDL_BlitSurface (src, NULL, rz_src, NULL);
src_converted = 1;
is32bit = 1;
}
if (zoomx < VALUE_LIMIT)
{
zoomx = VALUE_LIMIT;
}
if (zoomy < VALUE_LIMIT)
{
zoomy = VALUE_LIMIT;
}
dstwidth = (int) ((double) rz_src->w * zoomx);
dstheight = (int) ((double) rz_src->h * zoomy);
if (dstwidth < 1)
{
dstwidth = 1;
}
if (dstheight < 1)
{
dstheight = 1;
}
rz_dst = NULL;
if (is32bit)
{
rz_dst =
SDL_CreateRGBSurface (SDL_SWSURFACE, dstwidth, dstheight, 32,
rz_src->format->Rmask, rz_src->format->Gmask,
rz_src->format->Bmask, rz_src->format->Amask);
}
else
{
rz_dst =
SDL_CreateRGBSurface (SDL_SWSURFACE, dstwidth, dstheight, 8, 0, 0, 0,
0);
}
SDL_LockSurface (rz_src);
if (is32bit)
{
zoomSurfaceRGBA (rz_src, rz_dst, smooth);
SDL_SetAlpha (rz_dst, SDL_SRCALPHA, 255);
}
else
{
for (i = 0; i < rz_src->format->palette->ncolors; i++)
{
rz_dst->format->palette->colors[i] =
rz_src->format->palette->colors[i];
}
rz_dst->format->palette->ncolors = rz_src->format->palette->ncolors;
zoomSurfaceY (rz_src, rz_dst);
SDL_SetColorKey (rz_dst, SDL_SRCCOLORKEY | SDL_RLEACCEL,
rz_src->format->colorkey);
}
SDL_UnlockSurface (rz_src);
if (src_converted)
{
SDL_FreeSurface (rz_src);
}
return (rz_dst);
}
#ifdef WIN32
/* For DLL building under VC6 */
BOOL APIENTRY
DllMain (HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
#endif

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ediv/src/dlls/graphics/SDL_rotozoom.h Normal file
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#ifndef _SDL_rotozoom_h
#define _SDL_rotozoom_h
/* Set up for C function definitions, even when using C++ */
#ifdef __cplusplus
extern "C"
{
#endif
#include <math.h>
#ifndef M_PI
#define M_PI 3.141592654
#endif
#include "SDL.h"
/* ---- Defines */
#define SMOOTHING_OFF 0
#define SMOOTHING_ON 1
/* ---- Structures */
typedef struct tColorRGBA
{
Uint8 r;
Uint8 g;
Uint8 b;
Uint8 a;
}
tColorRGBA;
typedef struct tColorY
{
Uint8 y;
}
tColorY;
/* ---- Prototypes */
/*
rotozoomSurface()
Rotates and zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
'angle' is the rotation in degrees. 'zoom' a scaling factor. If 'smooth' is 1
then the destination 32bit surface is anti-aliased. If the surface is not 8bit
or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
*/
SDL_Surface *rotozoomSurface (SDL_Surface * src, double angle, double zoom,
int smooth);
/*
zoomSurface()
Zoomes a 32bit or 8bit 'src' surface to newly created 'dst' surface.
'zoomx' and 'zoomy' are scaling factors for width and height. If 'smooth' is 1
then the destination 32bit surface is anti-aliased. If the surface is not 8bit
or 32bit RGBA/ABGR it will be converted into a 32bit RGBA format on the fly.
*/
SDL_Surface *zoomSurface (SDL_Surface * src, double zoomx, double zoomy,
int smooth);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
};
#endif
#endif /* _SDL_rotozoom_h */

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/*
SDL_rotozoom - test program
Copyright (C) A. Schiffler, July 2001
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef WIN32
#include <windows.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "SDL.h"
#include "SDL_rotozoom.h"
void
HandleEvent ()
{
SDL_Event event;
/* Check for events */
while (SDL_PollEvent (&event))
{
switch (event.type)
{
case SDL_KEYDOWN:
case SDL_QUIT:
exit (0);
break;
}
}
}
void
ClearScreen (SDL_Surface * screen)
{
int i;
/* Set the screen to black */
if (SDL_LockSurface (screen) == 0)
{
Uint32 black;
Uint8 *pixels;
black = SDL_MapRGB (screen->format, 0, 0, 0);
pixels = (Uint8 *) screen->pixels;
for (i = 0; i < screen->h; ++i)
{
memset (pixels, black, screen->w * screen->format->BytesPerPixel);
pixels += screen->pitch;
}
SDL_UnlockSurface (screen);
}
}
void
RotatePicture (SDL_Surface * screen, SDL_Surface * picture, int rotate,
int smooth)
{
SDL_Surface *rotozoom_picture;
SDL_Rect dest;
int framecount, framemax, frameinc;
float zoomf;
/* Rotate and display the picture */
framemax = 4 * 360;
frameinc = 1;
for (framecount = 360; framecount < framemax; framecount += frameinc)
{
if ((framecount % 360) == 0)
frameinc++;
HandleEvent ();
ClearScreen (screen);
zoomf = (float) framecount / (float) framemax;
zoomf = 1.5 * zoomf * zoomf;
if ((rotozoom_picture =
rotozoomSurface (picture, framecount * rotate, zoomf,
smooth)) != NULL)
{
dest.x = (screen->w - rotozoom_picture->w) / 2;;
dest.y = (screen->h - rotozoom_picture->h) / 2;
dest.w = rotozoom_picture->w;
dest.h = rotozoom_picture->h;
if (SDL_BlitSurface (rotozoom_picture, NULL, screen, &dest) < 0)
{
fprintf (stderr, "Blit failed: %s\n", SDL_GetError ());
break;
}
SDL_FreeSurface (rotozoom_picture);
}
/* Display by flipping screens */
SDL_UpdateRect (screen, 0, 0, 0, 0);
}
if (rotate)
{
/* Final display with angle=0 */
HandleEvent ();
ClearScreen (screen);
if ((rotozoom_picture =
rotozoomSurface (picture, 0.01, zoomf, smooth)) != NULL)
{
dest.x = (screen->w - rotozoom_picture->w) / 2;;
dest.y = (screen->h - rotozoom_picture->h) / 2;
dest.w = rotozoom_picture->w;
dest.h = rotozoom_picture->h;
if (SDL_BlitSurface (rotozoom_picture, NULL, screen, &dest) < 0)
{
fprintf (stderr, "Blit failed: %s\n", SDL_GetError ());
return;
}
SDL_FreeSurface (rotozoom_picture);
}
/* Display by flipping screens */
SDL_UpdateRect (screen, 0, 0, 0, 0);
}
/* Pause for a sec */
SDL_Delay (1000);
}
void
ZoomPicture (SDL_Surface * screen, SDL_Surface * picture, int smooth)
{
SDL_Surface *rotozoom_picture;
SDL_Rect dest;
int framecount, framemax, frameinc;
float zoomxf, zoomyf;
/* Zoom and display the picture */
framemax = 4 * 360;
frameinc = 1;
for (framecount = 360; framecount < framemax; framecount += frameinc)
{
if ((framecount % 360) == 0)
frameinc++;
HandleEvent ();
ClearScreen (screen);
zoomxf = (float) framecount / (float) framemax;
zoomxf = 1.5 * zoomxf * zoomxf;
zoomyf = 0.5 + fabs (1.0 * sin ((double) framecount / 80.0));
if ((rotozoom_picture =
zoomSurface (picture, zoomxf, zoomyf, smooth)) != NULL)
{
dest.x = (screen->w - rotozoom_picture->w) / 2;;
dest.y = (screen->h - rotozoom_picture->h) / 2;
dest.w = rotozoom_picture->w;
dest.h = rotozoom_picture->h;
if (SDL_BlitSurface (rotozoom_picture, NULL, screen, &dest) < 0)
{
fprintf (stderr, "Blit failed: %s\n", SDL_GetError ());
break;
}
SDL_FreeSurface (rotozoom_picture);
}
/* Display by flipping screens */
SDL_UpdateRect (screen, 0, 0, 0, 0);
}
/* Pause for a sec */
SDL_Delay (1000);
}
void
Draw (SDL_Surface * screen)
{
SDL_Surface *picture, *picture_again;
char *bmpfile;
/* --------- 8 bit test -------- */
/* Message */
fprintf (stderr, "Loading 8bit image\n");
/* Load the image into a surface */
/*
bmpfile = "sample8.bmp";
fprintf (stderr, "Loading picture: %s\n", bmpfile);
picture = SDL_LoadBMP (bmpfile);
if (picture == NULL)
{
fprintf (stderr, "Couldn't load %s: %s\n", bmpfile, SDL_GetError ());
return;
}
fprintf (stderr, "rotozoom: Rotating and zooming\n");
RotatePicture (screen, picture, 1, SMOOTHING_OFF);
fprintf (stderr, "rotozoom: Just zooming (angle=0)\n");
RotatePicture (screen, picture, 0, SMOOTHING_OFF);
fprintf (stderr, "zoom: Just zooming\n");
ZoomPicture (screen, picture, SMOOTHING_OFF);
fprintf (stderr,
"rotozoom: Rotating and zooming, interpolation on but unused\n");
RotatePicture (screen, picture, 1, SMOOTHING_ON);
fprintf (stderr,
"rotozoom: Just zooming (angle=0), interpolation on but unused\n");
RotatePicture (screen, picture, 0, SMOOTHING_ON);
fprintf (stderr, "zoom: Just zooming, interpolation on but unused\n");
ZoomPicture (screen, picture, SMOOTHING_ON);
SDL_FreeSurface (picture);
*/
/* -------- 24 bit test --------- */
/* Message */
fprintf (stderr, "Loading 24bit image\n");
/* Load the image into a surface */
bmpfile = "sample24.bmp";
fprintf (stderr, "Loading picture: %s\n", bmpfile);
picture = SDL_LoadBMP (bmpfile);
if (picture == NULL)
{
fprintf (stderr, "Couldn't load %s: %s\n", bmpfile, SDL_GetError ());
return;
}
RotatePicture (screen, picture, 1, SMOOTHING_OFF);
/*
fprintf (stderr, "rotozoom: Rotating and zooming, no interpolation\n");
RotatePicture (screen, picture, 1, SMOOTHING_OFF);
fprintf (stderr, "rotozoom: Just zooming (angle=0), no interpolation\n");
RotatePicture (screen, picture, 0, SMOOTHING_OFF);
fprintf (stderr, "zoom: Just zooming, no interpolation\n");
ZoomPicture (screen, picture, SMOOTHING_OFF);
fprintf (stderr, "rotozoom: Rotating and zooming, with interpolation\n");
RotatePicture (screen, picture, 1, SMOOTHING_ON);
fprintf (stderr, "rotozoom: Just zooming (angle=0), with interpolation\n");
RotatePicture (screen, picture, 0, SMOOTHING_ON);
fprintf (stderr, "zoom: Just zooming, with interpolation\n");
ZoomPicture (screen, picture, SMOOTHING_ON);
fprintf (stderr, "Converting 24bit image into 32bit RGBA surface ...\n");
picture_again =
SDL_CreateRGBSurface (SDL_SWSURFACE, picture->w, picture->h, 32,
0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
SDL_BlitSurface (picture, NULL, picture_again, NULL);
fprintf (stderr, "Rotating and zooming, with interpolation\n");
RotatePicture (screen, picture_again, 1, SMOOTHING_ON);
fprintf (stderr, "Just zooming (angle=0), with interpolation\n");
RotatePicture (screen, picture_again, 0, SMOOTHING_ON);
SDL_FreeSurface (picture_again);
fprintf (stderr, "Converting 24bit image into 32bit ABGR surface ...\n");
picture_again =
SDL_CreateRGBSurface (SDL_SWSURFACE, picture->w, picture->h, 32,
0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000);
SDL_BlitSurface (picture, NULL, picture_again, NULL);
fprintf (stderr, "Rotating and zooming, with interpolation\n");
RotatePicture (screen, picture_again, 1, SMOOTHING_ON);
fprintf (stderr, "Just zooming (angle=0), with interpolation\n");
RotatePicture (screen, picture_again, 0, SMOOTHING_ON);
SDL_FreeSurface (picture_again);
/* Free the picture */
//SDL_FreeSurface (picture);
return;
}
#ifdef WIN32
extern char **__argv;
extern int __argc;
int APIENTRY
WinMain (HINSTANCE hInstance,
HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
#else // non WIN32
int
main (int argc, char *argv[])
#endif
{
SDL_Surface *screen;
int w, h;
int desired_bpp;
Uint32 video_flags;
#ifdef WIN32
int argc;
char **argv;
argv = __argv;
argc = __argc;
#endif
/* Title */
fprintf (stderr, "SDL_rotozoom test\n");
/* Set default options and check command-line */
w = 640;
h = 480;
desired_bpp = 0;
video_flags = 0;
while (argc > 1)
{
if (strcmp (argv[1], "-width") == 0)
{
if (argv[2] && ((w = atoi (argv[2])) > 0))
{
argv += 2;
argc -= 2;
}
else
{
fprintf (stderr, "The -width option requires an argument\n");
exit (1);
}
}
else if (strcmp (argv[1], "-height") == 0)
{
if (argv[2] && ((h = atoi (argv[2])) > 0))
{
argv += 2;
argc -= 2;
}
else
{
fprintf (stderr, "The -height option requires an argument\n");
exit (1);
}
}
else if (strcmp (argv[1], "-bpp") == 0)
{
if (argv[2])
{
desired_bpp = atoi (argv[2]);
argv += 2;
argc -= 2;
}
else
{
fprintf (stderr, "The -bpp option requires an argument\n");
exit (1);
}
}
else if (strcmp (argv[1], "-warp") == 0)
{
video_flags |= SDL_HWPALETTE;
argv += 1;
argc -= 1;
}
else if (strcmp (argv[1], "-hw") == 0)
{
video_flags |= SDL_HWSURFACE;
argv += 1;
argc -= 1;
}
else if (strcmp (argv[1], "-fullscreen") == 0)
{
video_flags |= SDL_FULLSCREEN;
argv += 1;
argc -= 1;
}
else
break;
}
/* Force double buffering */
video_flags |= SDL_DOUBLEBUF;
/* Initialize SDL */
if (SDL_Init (SDL_INIT_VIDEO) < 0)
{
fprintf (stderr, "Couldn't initialize SDL: %s\n", SDL_GetError ());
exit (1);
}
atexit (SDL_Quit); /* Clean up on exit */
/* Initialize the display */
screen = SDL_SetVideoMode (w, h, desired_bpp, video_flags);
if (screen == NULL)
{
fprintf (stderr, "Couldn't set %dx%dx%d video mode: %s\n",
w, h, desired_bpp, SDL_GetError ());
exit (1);
}
/* Show some info */
printf ("Set %dx%dx%d mode\n",
screen->w, screen->h, screen->format->BitsPerPixel);
printf ("Video surface located in %s memory.\n",
(screen->flags & SDL_HWSURFACE) ? "video" : "system");
/* Check for double buffering */
if (screen->flags & SDL_DOUBLEBUF)
{
printf ("Double-buffering enabled - good!\n");
}
/* Set the window manager title bar */
SDL_WM_SetCaption ("SDL_rotozoom test", "rotozoom");
/* Do all the drawing work */
Draw (screen);
return (0);
}