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transform.c
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transform.c
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/*
pygame - Python Game Library
Copyright (C) 2000-2001 Pete Shinners
Copyright (C) 2007 Rene Dudfield, Richard Goedeken
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Pete Shinners
pete@shinners.org
*/
/*
* surface transformations for pygame
*/
#include "pygame.h"
#include "pgcompat.h"
#include "doc/transform_doc.h"
#include <math.h>
#include <string.h>
#include "scale.h"
typedef void (*SMOOTHSCALE_FILTER_P)(Uint8 *, Uint8 *, int, int, int, int,
int);
struct _module_state {
const char *filter_type;
SMOOTHSCALE_FILTER_P filter_shrink_X;
SMOOTHSCALE_FILTER_P filter_shrink_Y;
SMOOTHSCALE_FILTER_P filter_expand_X;
SMOOTHSCALE_FILTER_P filter_expand_Y;
};
#define GETSTATE(m) ((struct _module_state *)PyModule_GetState(m))
#ifdef SCALE_MMX_SUPPORT
#include <SDL_cpuinfo.h>
#endif /* SCALE_MMX_SUPPORT */
void
scale2x(SDL_Surface *src, SDL_Surface *dst);
void
scale2xraw(SDL_Surface *src, SDL_Surface *dst);
extern SDL_Surface *
rotozoomSurface(SDL_Surface *src, double angle, double zoom, int smooth);
static int
_PgSurface_SrcAlpha(SDL_Surface *surf)
{
if (SDL_ISPIXELFORMAT_ALPHA(surf->format->format)) {
SDL_BlendMode mode;
if (SDL_GetSurfaceBlendMode(surf, &mode) < 0) {
return -1;
}
if (mode == SDL_BLENDMODE_BLEND)
return 1;
}
else {
Uint8 color = SDL_ALPHA_OPAQUE;
if (SDL_GetSurfaceAlphaMod(surf, &color) != 0) {
return -1;
}
if (color != SDL_ALPHA_OPAQUE)
return 1;
}
return 0;
}
static SDL_Surface *
newsurf_fromsurf(SDL_Surface *surf, int width, int height)
{
SDL_Surface *newsurf;
Uint32 colorkey;
Uint8 alpha;
int isalpha;
if (surf->format->BytesPerPixel == 0 || surf->format->BytesPerPixel > 4)
return (SDL_Surface *)(RAISE(
PyExc_ValueError, "unsupport Surface bit depth for transform"));
newsurf = SDL_CreateRGBSurface(surf->flags, width, height,
surf->format->BitsPerPixel,
surf->format->Rmask, surf->format->Gmask,
surf->format->Bmask, surf->format->Amask);
if (!newsurf)
return (SDL_Surface *)(RAISE(pgExc_SDLError, SDL_GetError()));
/* Copy palette, colorkey, etc info */
if (SDL_ISPIXELFORMAT_INDEXED(surf->format->format)) {
if (SDL_SetPaletteColors(newsurf->format->palette,
surf->format->palette->colors, 0,
surf->format->palette->ncolors) != 0) {
PyErr_SetString(pgExc_SDLError, SDL_GetError());
SDL_FreeSurface(newsurf);
return NULL;
}
}
if (SDL_GetSurfaceAlphaMod(surf, &alpha) != 0) {
PyErr_SetString(pgExc_SDLError, SDL_GetError());
SDL_FreeSurface(newsurf);
return NULL;
}
if (alpha != 255) {
if (SDL_SetSurfaceAlphaMod(newsurf, alpha) != 0) {
PyErr_SetString(pgExc_SDLError, SDL_GetError());
SDL_FreeSurface(newsurf);
return NULL;
}
}
isalpha = _PgSurface_SrcAlpha(surf);
if (isalpha == 1) {
if (SDL_SetSurfaceBlendMode(newsurf, SDL_BLENDMODE_BLEND) != 0) {
PyErr_SetString(pgExc_SDLError, SDL_GetError());
SDL_FreeSurface(newsurf);
return NULL;
}
}
else if (isalpha == -1) {
PyErr_SetString(pgExc_SDLError, SDL_GetError());
SDL_FreeSurface(newsurf);
return NULL;
}
else {
if (SDL_SetSurfaceBlendMode(newsurf, SDL_BLENDMODE_NONE) != 0) {
PyErr_SetString(pgExc_SDLError, SDL_GetError());
SDL_FreeSurface(newsurf);
return NULL;
}
}
if (SDL_GetColorKey(surf, &colorkey) == 0) {
if (SDL_SetColorKey(newsurf, SDL_TRUE, colorkey) != 0 ||
SDL_SetSurfaceRLE(newsurf, SDL_TRUE) != 0) {
PyErr_SetString(pgExc_SDLError, SDL_GetError());
SDL_FreeSurface(newsurf);
return NULL;
}
}
return newsurf;
}
static SDL_Surface *
rotate90(SDL_Surface *src, int angle)
{
int numturns = (angle / 90) % 4;
int dstwidth, dstheight;
SDL_Surface *dst;
char *srcpix, *dstpix, *srcrow, *dstrow;
int srcstepx, srcstepy, dststepx, dststepy;
int loopx, loopy;
if (numturns < 0)
numturns = 4 + numturns;
if (!(numturns % 2)) {
dstwidth = src->w;
dstheight = src->h;
}
else {
dstwidth = src->h;
dstheight = src->w;
}
dst = newsurf_fromsurf(src, dstwidth, dstheight);
if (!dst)
return NULL;
Py_BEGIN_ALLOW_THREADS;
SDL_LockSurface(dst);
srcrow = (char *)src->pixels;
dstrow = (char *)dst->pixels;
srcstepx = dststepx = src->format->BytesPerPixel;
srcstepy = src->pitch;
dststepy = dst->pitch;
switch (numturns) {
/*case 0: we don't need to change anything*/
case 1:
srcrow += ((src->w - 1) * srcstepx);
srcstepy = -srcstepx;
srcstepx = src->pitch;
break;
case 2:
srcrow += ((src->h - 1) * srcstepy) + ((src->w - 1) * srcstepx);
srcstepx = -srcstepx;
srcstepy = -srcstepy;
break;
case 3:
srcrow += ((src->h - 1) * srcstepy);
srcstepx = -srcstepy;
srcstepy = src->format->BytesPerPixel;
break;
}
switch (src->format->BytesPerPixel) {
case 1:
for (loopy = 0; loopy < dstheight; ++loopy) {
dstpix = dstrow;
srcpix = srcrow;
for (loopx = 0; loopx < dstwidth; ++loopx) {
*dstpix = *srcpix;
srcpix += srcstepx;
dstpix += dststepx;
}
dstrow += dststepy;
srcrow += srcstepy;
}
break;
case 2:
for (loopy = 0; loopy < dstheight; ++loopy) {
dstpix = dstrow;
srcpix = srcrow;
for (loopx = 0; loopx < dstwidth; ++loopx) {
*(Uint16 *)dstpix = *(Uint16 *)srcpix;
srcpix += srcstepx;
dstpix += dststepx;
}
dstrow += dststepy;
srcrow += srcstepy;
}
break;
case 3:
for (loopy = 0; loopy < dstheight; ++loopy) {
dstpix = dstrow;
srcpix = srcrow;
for (loopx = 0; loopx < dstwidth; ++loopx) {
dstpix[0] = srcpix[0];
dstpix[1] = srcpix[1];
dstpix[2] = srcpix[2];
srcpix += srcstepx;
dstpix += dststepx;
}
dstrow += dststepy;
srcrow += srcstepy;
}
break;
case 4:
for (loopy = 0; loopy < dstheight; ++loopy) {
dstpix = dstrow;
srcpix = srcrow;
for (loopx = 0; loopx < dstwidth; ++loopx) {
*(Uint32 *)dstpix = *(Uint32 *)srcpix;
srcpix += srcstepx;
dstpix += dststepx;
}
dstrow += dststepy;
srcrow += srcstepy;
}
break;
}
SDL_UnlockSurface(dst);
Py_END_ALLOW_THREADS;
return dst;
}
static void
rotate(SDL_Surface *src, SDL_Surface *dst, Uint32 bgcolor, double sangle,
double cangle)
{
int x, y, dx, dy;
Uint8 *srcpix = (Uint8 *)src->pixels;
Uint8 *dstrow = (Uint8 *)dst->pixels;
int srcpitch = src->pitch;
int dstpitch = dst->pitch;
int cy = dst->h / 2;
int xd = ((src->w - dst->w) << 15);
int yd = ((src->h - dst->h) << 15);
int isin = (int)(sangle * 65536);
int icos = (int)(cangle * 65536);
int ax = ((dst->w) << 15) - (int)(cangle * ((dst->w - 1) << 15));
int ay = ((dst->h) << 15) - (int)(sangle * ((dst->w - 1) << 15));
int xmaxval = ((src->w) << 16) - 1;
int ymaxval = ((src->h) << 16) - 1;
switch (src->format->BytesPerPixel) {
case 1:
for (y = 0; y < dst->h; y++) {
Uint8 *dstpos = (Uint8 *)dstrow;
dx = (ax + (isin * (cy - y))) + xd;
dy = (ay - (icos * (cy - y))) + yd;
for (x = 0; x < dst->w; x++) {
if (dx < 0 || dy < 0 || dx > xmaxval || dy > ymaxval)
*dstpos++ = bgcolor;
else
*dstpos++ =
*(Uint8 *)(srcpix + ((dy >> 16) * srcpitch) +
(dx >> 16));
dx += icos;
dy += isin;
}
dstrow += dstpitch;
}
break;
case 2:
for (y = 0; y < dst->h; y++) {
Uint16 *dstpos = (Uint16 *)dstrow;
dx = (ax + (isin * (cy - y))) + xd;
dy = (ay - (icos * (cy - y))) + yd;
for (x = 0; x < dst->w; x++) {
if (dx < 0 || dy < 0 || dx > xmaxval || dy > ymaxval)
*dstpos++ = bgcolor;
else
*dstpos++ =
*(Uint16 *)(srcpix + ((dy >> 16) * srcpitch) +
(dx >> 16 << 1));
dx += icos;
dy += isin;
}
dstrow += dstpitch;
}
break;
case 4:
for (y = 0; y < dst->h; y++) {
Uint32 *dstpos = (Uint32 *)dstrow;
dx = (ax + (isin * (cy - y))) + xd;
dy = (ay - (icos * (cy - y))) + yd;
for (x = 0; x < dst->w; x++) {
if (dx < 0 || dy < 0 || dx > xmaxval || dy > ymaxval)
*dstpos++ = bgcolor;
else
*dstpos++ =
*(Uint32 *)(srcpix + ((dy >> 16) * srcpitch) +
(dx >> 16 << 2));
dx += icos;
dy += isin;
}
dstrow += dstpitch;
}
break;
default: /*case 3:*/
for (y = 0; y < dst->h; y++) {
Uint8 *dstpos = (Uint8 *)dstrow;
dx = (ax + (isin * (cy - y))) + xd;
dy = (ay - (icos * (cy - y))) + yd;
for (x = 0; x < dst->w; x++) {
if (dx < 0 || dy < 0 || dx > xmaxval || dy > ymaxval) {
dstpos[0] = ((Uint8 *)&bgcolor)[0];
dstpos[1] = ((Uint8 *)&bgcolor)[1];
dstpos[2] = ((Uint8 *)&bgcolor)[2];
dstpos += 3;
}
else {
Uint8 *srcpos =
(Uint8 *)(srcpix + ((dy >> 16) * srcpitch) +
((dx >> 16) * 3));
dstpos[0] = srcpos[0];
dstpos[1] = srcpos[1];
dstpos[2] = srcpos[2];
dstpos += 3;
}
dx += icos;
dy += isin;
}
dstrow += dstpitch;
}
break;
}
}
static void
stretch(SDL_Surface *src, SDL_Surface *dst)
{
int looph, loopw;
Uint8 *srcrow = (Uint8 *)src->pixels;
Uint8 *dstrow = (Uint8 *)dst->pixels;
int srcpitch = src->pitch;
int dstpitch = dst->pitch;
int dstwidth = dst->w;
int dstheight = dst->h;
int dstwidth2 = dst->w << 1;
int dstheight2 = dst->h << 1;
int srcwidth2 = src->w << 1;
int srcheight2 = src->h << 1;
int w_err, h_err = srcheight2 - dstheight2;
switch (src->format->BytesPerPixel) {
case 1:
for (looph = 0; looph < dstheight; ++looph) {
Uint8 *srcpix = (Uint8 *)srcrow, *dstpix = (Uint8 *)dstrow;
w_err = srcwidth2 - dstwidth2;
for (loopw = 0; loopw < dstwidth; ++loopw) {
*dstpix++ = *srcpix;
while (w_err >= 0) {
++srcpix;
w_err -= dstwidth2;
}
w_err += srcwidth2;
}
while (h_err >= 0) {
srcrow += srcpitch;
h_err -= dstheight2;
}
dstrow += dstpitch;
h_err += srcheight2;
}
break;
case 2:
for (looph = 0; looph < dstheight; ++looph) {
Uint16 *srcpix = (Uint16 *)srcrow, *dstpix = (Uint16 *)dstrow;
w_err = srcwidth2 - dstwidth2;
for (loopw = 0; loopw < dstwidth; ++loopw) {
*dstpix++ = *srcpix;
while (w_err >= 0) {
++srcpix;
w_err -= dstwidth2;
}
w_err += srcwidth2;
}
while (h_err >= 0) {
srcrow += srcpitch;
h_err -= dstheight2;
}
dstrow += dstpitch;
h_err += srcheight2;
}
break;
case 3:
for (looph = 0; looph < dstheight; ++looph) {
Uint8 *srcpix = (Uint8 *)srcrow, *dstpix = (Uint8 *)dstrow;
w_err = srcwidth2 - dstwidth2;
for (loopw = 0; loopw < dstwidth; ++loopw) {
dstpix[0] = srcpix[0];
dstpix[1] = srcpix[1];
dstpix[2] = srcpix[2];
dstpix += 3;
while (w_err >= 0) {
srcpix += 3;
w_err -= dstwidth2;
}
w_err += srcwidth2;
}
while (h_err >= 0) {
srcrow += srcpitch;
h_err -= dstheight2;
}
dstrow += dstpitch;
h_err += srcheight2;
}
break;
default: /*case 4:*/
for (looph = 0; looph < dstheight; ++looph) {
Uint32 *srcpix = (Uint32 *)srcrow, *dstpix = (Uint32 *)dstrow;
w_err = srcwidth2 - dstwidth2;
for (loopw = 0; loopw < dstwidth; ++loopw) {
*dstpix++ = *srcpix;
while (w_err >= 0) {
++srcpix;
w_err -= dstwidth2;
}
w_err += srcwidth2;
}
while (h_err >= 0) {
srcrow += srcpitch;
h_err -= dstheight2;
}
dstrow += dstpitch;
h_err += srcheight2;
}
break;
}
}
static PyObject *
surf_scale(PyObject *self, PyObject *args, PyObject *kwargs)
{
pgSurfaceObject *surfobj;
PyObject *surfobj2 = NULL;
PyObject *size;
SDL_Surface *surf, *newsurf;
int width, height;
static char *keywords[] = {"surface", "size", "dest_surface", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O!O|O!", keywords,
&pgSurface_Type, &surfobj, &size,
&pgSurface_Type, &surfobj2))
return NULL;
if (!pg_TwoIntsFromObj(size, &width, &height))
return RAISE(PyExc_TypeError, "size must be two numbers");
if (width < 0 || height < 0)
return RAISE(PyExc_ValueError, "Cannot scale to negative size");
surf = pgSurface_AsSurface(surfobj);
if (!surfobj2) {
newsurf = newsurf_fromsurf(surf, width, height);
if (!newsurf)
return NULL;
}
else
newsurf = pgSurface_AsSurface(surfobj2);
/* check to see if the size is twice as big. */
if (newsurf->w != width || newsurf->h != height)
return RAISE(PyExc_ValueError,
"Destination surface not the given width or height.");
/* check to see if the format of the surface is the same. */
if (surf->format->BytesPerPixel != newsurf->format->BytesPerPixel)
return RAISE(PyExc_ValueError,
"Source and destination surfaces need the same format.");
if ((width && height) && (surf->w && surf->h)) {
SDL_LockSurface(newsurf);
pgSurface_Lock(surfobj);
Py_BEGIN_ALLOW_THREADS;
if (width == 2 * surf->w && height == 2 * surf->h) {
scale2xraw(surf, newsurf);
}
else {
stretch(surf, newsurf);
}
Py_END_ALLOW_THREADS;
pgSurface_Unlock(surfobj);
SDL_UnlockSurface(newsurf);
}
if (surfobj2) {
Py_INCREF(surfobj2);
return surfobj2;
}
else
return (PyObject *)pgSurface_New(newsurf);
}
static PyObject *
surf_scale2x(PyObject *self, PyObject *args, PyObject *kwargs)
{
PyObject *surfobj, *surfobj2 = NULL;
SDL_Surface *surf;
SDL_Surface *newsurf;
static char *keywords[] = {"surface", "dest_surface", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O!|O!", keywords,
&pgSurface_Type, &surfobj,
&pgSurface_Type, &surfobj2))
return NULL;
surf = pgSurface_AsSurface(surfobj);
/* if the second surface is not there, then make a new one. */
if (!surfobj2) {
int width = surf->w * 2;
int height = surf->h * 2;
newsurf = newsurf_fromsurf(surf, width, height);
if (!newsurf)
return NULL;
}
else
newsurf = pgSurface_AsSurface(surfobj2);
/* check to see if the size is twice as big. */
if (newsurf->w != (surf->w * 2) || newsurf->h != (surf->h * 2))
return RAISE(PyExc_ValueError, "Destination surface not 2x bigger.");
/* check to see if the format of the surface is the same. */
if (surf->format->BytesPerPixel != newsurf->format->BytesPerPixel)
return RAISE(PyExc_ValueError,
"Source and destination surfaces need the same format.");
SDL_LockSurface(newsurf);
SDL_LockSurface(surf);
Py_BEGIN_ALLOW_THREADS;
scale2x(surf, newsurf);
Py_END_ALLOW_THREADS;
SDL_UnlockSurface(surf);
SDL_UnlockSurface(newsurf);
if (surfobj2) {
Py_INCREF(surfobj2);
return surfobj2;
}
else
return (PyObject *)pgSurface_New(newsurf);
}
static PyObject *
surf_rotate(PyObject *self, PyObject *args, PyObject *kwargs)
{
pgSurfaceObject *surfobj;
SDL_Surface *surf, *newsurf;
float angle;
double radangle, sangle, cangle;
double x, y, cx, cy, sx, sy;
int nxmax, nymax;
Uint32 bgcolor;
static char *keywords[] = {"surface", "angle", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O!f", keywords,
&pgSurface_Type, &surfobj, &angle))
return NULL;
surf = pgSurface_AsSurface(surfobj);
if (surf->w < 1 || surf->h < 1) {
Py_INCREF(surfobj);
return surfobj;
}
if (surf->format->BytesPerPixel == 0 || surf->format->BytesPerPixel > 4)
return RAISE(PyExc_ValueError,
"unsupport Surface bit depth for transform");
if (!(fmod((double)angle, (double)90.0f))) {
pgSurface_Lock(surfobj);
/* The function releases GIL internally, don't release here */
newsurf = rotate90(surf, (int)angle);
pgSurface_Unlock(surfobj);
if (!newsurf)
return NULL;
return (PyObject *)pgSurface_New(newsurf);
}
radangle = angle * .01745329251994329;
sangle = sin(radangle);
cangle = cos(radangle);
x = surf->w;
y = surf->h;
cx = cangle * x;
cy = cangle * y;
sx = sangle * x;
sy = sangle * y;
nxmax = (int)(MAX(MAX(MAX(fabs(cx + sy), fabs(cx - sy)), fabs(-cx + sy)),
fabs(-cx - sy)));
nymax = (int)(MAX(MAX(MAX(fabs(sx + cy), fabs(sx - cy)), fabs(-sx + cy)),
fabs(-sx - cy)));
newsurf = newsurf_fromsurf(surf, nxmax, nymax);
if (!newsurf)
return NULL;
/* get the background color */
if (SDL_GetColorKey(surf, &bgcolor) != 0) {
SDL_LockSurface(surf);
switch (surf->format->BytesPerPixel) {
case 1:
bgcolor = *(Uint8 *)surf->pixels;
break;
case 2:
bgcolor = *(Uint16 *)surf->pixels;
break;
case 4:
bgcolor = *(Uint32 *)surf->pixels;
break;
default: /*case 3:*/
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
bgcolor = (((Uint8 *)surf->pixels)[0]) +
(((Uint8 *)surf->pixels)[1] << 8) +
(((Uint8 *)surf->pixels)[2] << 16);
#else
bgcolor = (((Uint8 *)surf->pixels)[2]) +
(((Uint8 *)surf->pixels)[1] << 8) +
(((Uint8 *)surf->pixels)[0] << 16);
#endif
}
SDL_UnlockSurface(surf);
bgcolor &= ~surf->format->Amask;
}
SDL_LockSurface(newsurf);
pgSurface_Lock(surfobj);
Py_BEGIN_ALLOW_THREADS;
rotate(surf, newsurf, bgcolor, sangle, cangle);
Py_END_ALLOW_THREADS;
pgSurface_Unlock(surfobj);
SDL_UnlockSurface(newsurf);
return (PyObject *)pgSurface_New(newsurf);
}
static PyObject *
surf_flip(PyObject *self, PyObject *args, PyObject *kwargs)
{
pgSurfaceObject *surfobj;
SDL_Surface *surf, *newsurf;
int xaxis, yaxis;
int loopx, loopy;
int srcpitch, dstpitch;
Uint8 *srcpix, *dstpix;
static char *keywords[] = {"surface", "flip_x", "flip_y", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O!ii", keywords,
&pgSurface_Type, &surfobj, &xaxis,
&yaxis))
return NULL;
surf = pgSurface_AsSurface(surfobj);
newsurf = newsurf_fromsurf(surf, surf->w, surf->h);
if (!newsurf)
return NULL;
srcpitch = surf->pitch;
dstpitch = newsurf->pitch;
SDL_LockSurface(newsurf);
pgSurface_Lock(surfobj);
srcpix = (Uint8 *)surf->pixels;
dstpix = (Uint8 *)newsurf->pixels;
Py_BEGIN_ALLOW_THREADS;
if (!xaxis) {
if (!yaxis) {
for (loopy = 0; loopy < surf->h; ++loopy)
memcpy(dstpix + loopy * dstpitch, srcpix + loopy * srcpitch,
surf->w * surf->format->BytesPerPixel);
}
else {
for (loopy = 0; loopy < surf->h; ++loopy)
memcpy(dstpix + loopy * dstpitch,
srcpix + (surf->h - 1 - loopy) * srcpitch,
surf->w * surf->format->BytesPerPixel);
}
}
else /*if (xaxis)*/
{
if (yaxis) {
switch (surf->format->BytesPerPixel) {
case 1:
for (loopy = 0; loopy < surf->h; ++loopy) {
Uint8 *dst = (Uint8 *)(dstpix + loopy * dstpitch);
Uint8 *src =
((Uint8 *)(srcpix +
(surf->h - 1 - loopy) * srcpitch)) +
surf->w - 1;
for (loopx = 0; loopx < surf->w; ++loopx)
*dst++ = *src--;
}
break;
case 2:
for (loopy = 0; loopy < surf->h; ++loopy) {
Uint16 *dst = (Uint16 *)(dstpix + loopy * dstpitch);
Uint16 *src =
((Uint16 *)(srcpix +
(surf->h - 1 - loopy) * srcpitch)) +
surf->w - 1;
for (loopx = 0; loopx < surf->w; ++loopx)
*dst++ = *src--;
}
break;
case 4:
for (loopy = 0; loopy < surf->h; ++loopy) {
Uint32 *dst = (Uint32 *)(dstpix + loopy * dstpitch);
Uint32 *src =
((Uint32 *)(srcpix +
(surf->h - 1 - loopy) * srcpitch)) +
surf->w - 1;
for (loopx = 0; loopx < surf->w; ++loopx)
*dst++ = *src--;
}
break;
case 3:
for (loopy = 0; loopy < surf->h; ++loopy) {
Uint8 *dst = (Uint8 *)(dstpix + loopy * dstpitch);
Uint8 *src =
((Uint8 *)(srcpix +
(surf->h - 1 - loopy) * srcpitch)) +
surf->w * 3 - 3;
for (loopx = 0; loopx < surf->w; ++loopx) {
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
dst += 3;
src -= 3;
}
}
break;
}
}
else {
switch (surf->format->BytesPerPixel) {
case 1:
for (loopy = 0; loopy < surf->h; ++loopy) {
Uint8 *dst = (Uint8 *)(dstpix + loopy * dstpitch);
Uint8 *src = ((Uint8 *)(srcpix + loopy * srcpitch)) +
surf->w - 1;
for (loopx = 0; loopx < surf->w; ++loopx)
*dst++ = *src--;
}
break;
case 2:
for (loopy = 0; loopy < surf->h; ++loopy) {
Uint16 *dst = (Uint16 *)(dstpix + loopy * dstpitch);
Uint16 *src = ((Uint16 *)(srcpix + loopy * srcpitch)) +
surf->w - 1;
for (loopx = 0; loopx < surf->w; ++loopx)
*dst++ = *src--;
}
break;
case 4:
for (loopy = 0; loopy < surf->h; ++loopy) {
Uint32 *dst = (Uint32 *)(dstpix + loopy * dstpitch);
Uint32 *src = ((Uint32 *)(srcpix + loopy * srcpitch)) +
surf->w - 1;
for (loopx = 0; loopx < surf->w; ++loopx)
*dst++ = *src--;
}
break;
case 3:
for (loopy = 0; loopy < surf->h; ++loopy) {
Uint8 *dst = (Uint8 *)(dstpix + loopy * dstpitch);
Uint8 *src = ((Uint8 *)(srcpix + loopy * srcpitch)) +
surf->w * 3 - 3;
for (loopx = 0; loopx < surf->w; ++loopx) {
dst[0] = src[0];
dst[1] = src[1];
dst[2] = src[2];
dst += 3;
src -= 3;
}
}
break;
}
}
}
Py_END_ALLOW_THREADS;
pgSurface_Unlock(surfobj);
SDL_UnlockSurface(newsurf);
return (PyObject *)pgSurface_New(newsurf);
}
static PyObject *
surf_rotozoom(PyObject *self, PyObject *args, PyObject *kwargs)
{
pgSurfaceObject *surfobj;
SDL_Surface *surf, *newsurf, *surf32;
float scale, angle;
static char *keywords[] = {"surface", "angle", "scale", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O!ff", keywords,
&pgSurface_Type, &surfobj, &angle,
&scale))
return NULL;
surf = pgSurface_AsSurface(surfobj);
if (scale == 0.0 || surf->w == 0 || surf->h == 0) {
newsurf = newsurf_fromsurf(surf, 0, 0);
return (PyObject *)pgSurface_New(newsurf);
}
if (surf->format->BitsPerPixel == 32) {
surf32 = surf;
pgSurface_Lock(surfobj);
}
else {
Py_BEGIN_ALLOW_THREADS;
surf32 = SDL_CreateRGBSurface(SDL_SWSURFACE, surf->w, surf->h, 32,
0x000000ff, 0x0000ff00, 0x00ff0000,
0xff000000);
SDL_BlitSurface(surf, NULL, surf32, NULL);
Py_END_ALLOW_THREADS;
}
Py_BEGIN_ALLOW_THREADS;
newsurf = rotozoomSurface(surf32, angle, scale, 1);
Py_END_ALLOW_THREADS;
if (surf32 == surf)
pgSurface_Unlock(surfobj);
else
SDL_FreeSurface(surf32);
return (PyObject *)pgSurface_New(newsurf);
}
static SDL_Surface *
chop(SDL_Surface *src, int x, int y, int width, int height)
{
SDL_Surface *dst;
int dstwidth, dstheight;
char *srcpix, *dstpix, *srcrow, *dstrow;
int srcstepx, srcstepy, dststepx, dststepy;
int loopx, loopy;
if ((x + width) > src->w)
width = MIN(MAX(src->w - x, 0), src->w);
if ((y + height) > src->h)
height = MIN(MAX(src->h - y, 0), src->h);
if (x < 0) {
width -= (-x);
x = 0;
}
if (y < 0) {
height -= (-y);
y = 0;
}
dstwidth = src->w - width;
dstheight = src->h - height;
dst = newsurf_fromsurf(src, dstwidth, dstheight);
if (!dst)
return NULL;
Py_BEGIN_ALLOW_THREADS;
SDL_LockSurface(dst);
srcrow = (char *)src->pixels;
dstrow = (char *)dst->pixels;
srcstepx = dststepx = src->format->BytesPerPixel;
srcstepy = src->pitch;
dststepy = dst->pitch;
for (loopy = 0; loopy < src->h; loopy++) {
if ((loopy < y) || (loopy >= (y + height))) {
dstpix = dstrow;
srcpix = srcrow;
for (loopx = 0; loopx < src->w; loopx++) {
if ((loopx < x) || (loopx >= (x + width))) {
switch (src->format->BytesPerPixel) {
case 1:
*dstpix = *srcpix;
break;
case 2:
*(Uint16 *)dstpix = *(Uint16 *)srcpix;
break;
case 3:
dstpix[0] = srcpix[0];
dstpix[1] = srcpix[1];
dstpix[2] = srcpix[2];
break;
case 4:
*(Uint32 *)dstpix = *(Uint32 *)srcpix;
break;
}
dstpix += dststepx;
}
srcpix += srcstepx;
}
dstrow += dststepy;
}
srcrow += srcstepy;
}
SDL_UnlockSurface(dst);
Py_END_ALLOW_THREADS;
return dst;
}
static PyObject *
surf_chop(PyObject *self, PyObject *args, PyObject *kwargs)
{
PyObject *surfobj, *rectobj;
SDL_Surface *surf, *newsurf;
SDL_Rect *rect, temp;
static char *keywords[] = {"surface", "rect", NULL};
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "O!O", keywords,
&pgSurface_Type, &surfobj, &rectobj))
return NULL;
if (!(rect = pgRect_FromObject(rectobj, &temp)))
return RAISE(PyExc_TypeError, "Rect argument is invalid");
surf = pgSurface_AsSurface(surfobj);
/* The function releases GIL internally, don't release here */
newsurf = chop(surf, rect->x, rect->y, rect->w, rect->h);
return (PyObject *)pgSurface_New(newsurf);
}
/*
* smooth scale functions.