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pixelarray_methods.c
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/*
pygame-ce - Python Game Library
Copyright (C) 2007-2008 Marcus von Appen
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
*/
/* Simple weighted Euclidean distance, which tries to get near to the
* human eye reception using the weights.
* It receives RGB values in the range 0-255 and returns a distance
* value between 0.0 and 1.0.
*/
#define COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2, b2) \
(sqrt(wr * (r1 - r2) * (r1 - r2) + wg * (g1 - g2) * (g1 - g2) + \
wb * (b1 - b2) * (b1 - b2)) / \
255.0)
#define WR_NTSC 0.299
#define WG_NTSC 0.587
#define WB_NTSC 0.114
/**
* Tries to retrieve a valid color for a Surface.
*/
static int
_get_color_from_object(PyObject *val, SDL_Surface *surf, Uint32 *color)
{
if (!val) {
return 0;
}
return pg_MappedColorFromObj(
val, surf, color, PG_COLOR_HANDLE_INT | PG_COLOR_HANDLE_RESTRICT_SEQ);
}
/**
* Retrieves a single pixel located at index from the surface pixel
* array.
*/
static PyObject *
_get_single_pixel(pgPixelArrayObject *array, Py_ssize_t x, Py_ssize_t y)
{
Uint8 *pixel_p;
SDL_Surface *surf;
int bpp;
Uint32 pixel;
if (array->surface == NULL) {
return RAISE(PyExc_ValueError, "Operation on closed PixelArray.");
}
pixel_p = (array->pixels + x * array->strides[0] + y * array->strides[1]);
surf = pgSurface_AsSurface(array->surface);
bpp = PG_SURF_BytesPerPixel(surf);
/* Find the start of the pixel */
switch (bpp) {
case 1:
pixel = (Uint32)*pixel_p;
break;
case 2:
pixel = (Uint32) * ((Uint16 *)pixel_p);
break;
case 3:
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
pixel = ((Uint32)pixel_p[0] + ((Uint32)pixel_p[1] << 8) +
((Uint32)pixel_p[2] << 16));
#else
pixel = ((Uint32)pixel_p[2] + ((Uint32)pixel_p[1] << 8) +
((Uint32)pixel_p[0] << 16));
#endif
break;
default: /* 4 */
assert(bpp == 4);
pixel = *((Uint32 *)pixel_p);
}
return PyLong_FromLong((long)pixel);
}
/**
* Creates a new surface using the currently applied dimensions, step
* size, etc.
*/
static PyObject *
_make_surface(pgPixelArrayObject *array, PyObject *args)
{
SDL_Surface *surf;
int bpp;
Py_ssize_t dim0 = array->shape[0];
Py_ssize_t dim1 = array->shape[1] ? array->shape[1] : 1;
Py_ssize_t stride0 = array->strides[0];
Py_ssize_t stride1 = array->strides[1];
pgSurfaceObject *new_surface;
SDL_Surface *temp_surf;
SDL_Surface *new_surf;
Py_ssize_t new_stride0;
Py_ssize_t new_stride1;
Uint8 *pixels = array->pixels;
Uint8 *new_pixels;
Py_ssize_t x;
Py_ssize_t y;
Uint8 *pixelrow;
Uint8 *pixel_p;
Uint8 *new_pixelrow;
Uint8 *new_pixel_p;
if (array->surface == NULL) {
return RAISE(PyExc_ValueError, "Operation on closed PixelArray.");
}
surf = pgSurface_AsSurface(array->surface);
bpp = PG_SURF_BytesPerPixel(surf);
temp_surf = surf;
const int same_dims = (dim0 == surf->w && dim1 == surf->h);
/* If the array dimensions are different from the surface dimensions,
* create a new surface with the array dimensions */
if (!same_dims) {
if (!(temp_surf = PG_CreateSurface((int)dim0, (int)dim1,
surf->format->format)))
return RAISE(pgExc_SDLError, SDL_GetError());
}
/* Ensure the new surface has the same format as the original */
new_surf = PG_ConvertSurface(temp_surf, surf->format);
if (temp_surf != surf)
SDL_FreeSurface(temp_surf);
if (!new_surf) {
return RAISE(pgExc_SDLError, SDL_GetError());
}
new_surface = pgSurface_New(new_surf);
if (!new_surface) {
SDL_FreeSurface(new_surf);
return 0;
}
/* if the surf and array dims match just return a copy */
if (same_dims)
return (PyObject *)new_surface;
/* Acquire a temporary lock. */
if (SDL_MUSTLOCK(new_surf) == 0) {
SDL_LockSurface(new_surf);
}
new_pixels = (Uint8 *)new_surf->pixels;
new_stride0 = PG_SURF_BytesPerPixel(new_surf);
new_stride1 = new_surf->pitch;
pixelrow = pixels;
new_pixelrow = new_pixels;
Py_BEGIN_ALLOW_THREADS;
if (stride0 == new_stride0) {
/* if src and dest have the same bpp, so we can copy the whole
* rows at once */
y = dim1;
while (y--) {
memcpy(new_pixelrow, pixelrow, stride0 * dim0);
pixelrow += stride1;
new_pixelrow += new_stride1;
}
}
else {
switch (bpp) {
case 1:
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
new_pixel_p = new_pixelrow;
for (x = 0; x < dim0; ++x) {
*new_pixel_p = *pixel_p;
pixel_p += stride0;
new_pixel_p += new_stride0;
}
pixelrow += stride1;
new_pixelrow += new_stride1;
}
break;
case 2:
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
new_pixel_p = new_pixelrow;
for (x = 0; x < dim0; ++x) {
*((Uint16 *)new_pixel_p) = *((Uint16 *)pixel_p);
pixel_p += stride0;
new_pixel_p += new_stride0;
}
pixelrow += stride1;
new_pixelrow += new_stride1;
}
break;
case 3:
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
new_pixel_p = new_pixelrow;
for (x = 0; x < dim0; ++x) {
memcpy(new_pixel_p, pixel_p, 3);
pixel_p += stride0;
new_pixel_p += new_stride0;
}
pixelrow += stride1;
new_pixelrow += new_stride1;
}
break;
default: /* case: 4 */
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
new_pixel_p = new_pixelrow;
for (x = 0; x < dim0; ++x) {
*((Uint32 *)new_pixel_p) = *((Uint32 *)pixel_p);
pixel_p += stride0;
new_pixel_p += new_stride0;
}
pixelrow += stride1;
new_pixelrow += new_stride1;
}
}
}
Py_END_ALLOW_THREADS;
if (SDL_MUSTLOCK(new_surf) == 0) {
SDL_UnlockSurface(new_surf);
}
return (PyObject *)new_surface;
}
static int
_get_weights(PyObject *weights, float *wr, float *wg, float *wb)
{
int success = 1;
float rgb[3] = {0};
if (!weights) {
*wr = (float)WR_NTSC;
*wg = (float)WG_NTSC;
*wb = (float)WB_NTSC;
return 1;
}
if (!PySequence_Check(weights)) {
PyErr_SetString(PyExc_TypeError, "weights must be a sequence");
success = 0;
}
else if (PySequence_Size(weights) < 3) {
PyErr_SetString(PyExc_TypeError,
"weights must contain at least 3 values");
success = 0;
}
else {
PyObject *item;
int i;
for (i = 0; i < 3; ++i) {
item = PySequence_GetItem(weights, i);
if (!item) {
success = 0;
break;
}
if (PyNumber_Check(item)) {
PyObject *num;
if ((num = PyNumber_Float(item))) {
rgb[i] = (float)PyFloat_AsDouble(num);
Py_DECREF(num);
}
else if (PyErr_Clear(), (num = PyNumber_Long(item))) {
rgb[i] = (float)PyLong_AsLong(num);
success = rgb[i] != -1 || !PyErr_Occurred();
Py_DECREF(num);
}
else if (PyErr_Clear(), (num = PyNumber_Long(item))) {
rgb[i] = (float)PyLong_AsLong(num);
success = (!PyErr_Occurred() ||
!PyErr_ExceptionMatches(PyExc_OverflowError));
Py_DECREF(num);
}
else {
PyErr_Clear();
PyErr_Format(PyExc_TypeError,
"Unrecognized number type %s",
Py_TYPE(item)->tp_name);
success = 0;
}
}
else {
PyErr_SetString(PyExc_TypeError, "invalid weights");
success = 0;
}
Py_XDECREF(item);
if (!success) {
break;
}
}
}
if (success) {
float sum = 0;
*wr = rgb[0];
*wg = rgb[1];
*wb = rgb[2];
if ((*wr < 0 || *wg < 0 || *wb < 0) ||
(*wr == 0 && *wg == 0 && *wb == 0)) {
PyErr_SetString(PyExc_ValueError,
"weights must be positive and greater than 0");
return 0;
}
/* Build the average weight values. */
sum = *wr + *wg + *wb;
*wr = *wr / sum;
*wg = *wg / sum;
*wb = *wb / sum;
return success;
}
return 0;
}
static PyObject *
_replace_color(pgPixelArrayObject *array, PyObject *args, PyObject *kwds)
{
PyObject *weights = 0;
PyObject *delcolor = 0;
PyObject *replcolor = 0;
SDL_Surface *surf;
SDL_PixelFormat *format;
Py_ssize_t dim0 = array->shape[0];
Py_ssize_t dim1 = array->shape[1];
Py_ssize_t stride0 = array->strides[0];
Py_ssize_t stride1 = array->strides[1];
Uint8 *pixels = array->pixels;
int bpp;
Uint32 dcolor;
Uint32 rcolor;
Uint8 r1, g1, b1, r2, g2, b2, a2;
Uint8 *pixelrow;
Uint8 *pixel_p;
float distance = 0;
float wr, wg, wb;
Py_ssize_t x;
Py_ssize_t y;
static char *keys[] = {"color", "repcolor", "distance", "weights", NULL};
if (array->surface == NULL) {
return RAISE(PyExc_ValueError, "Operation on closed PixelArray.");
}
surf = pgSurface_AsSurface(array->surface);
if (!PyArg_ParseTupleAndKeywords(args, kwds, "OO|fO", keys, &delcolor,
&replcolor, &distance, &weights)) {
return 0;
}
if (distance < 0 || distance > 1) {
return RAISE(PyExc_ValueError,
"distance must be in the range from 0.0 to 1.0");
}
format = surf->format;
bpp = PG_SURF_BytesPerPixel(surf);
if (!_get_color_from_object(delcolor, surf, &dcolor) ||
!_get_color_from_object(replcolor, surf, &rcolor)) {
return 0;
}
if (!_get_weights(weights, &wr, &wg, &wb)) {
return 0;
}
if (distance != 0.0) {
SDL_GetRGB(dcolor, format, &r1, &g1, &b1);
}
if (!dim1) {
dim1 = 1;
}
pixelrow = pixels;
Py_BEGIN_ALLOW_THREADS;
switch (bpp) {
case 1: {
Uint8 *px_p;
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
for (x = 0; x < dim0; ++x) {
px_p = pixel_p;
if (distance != 0.0) {
GET_PIXELVALS_1(r2, g2, b2, a2, px_p, format);
if (COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2,
b2) <= distance) {
*px_p = (Uint8)rcolor;
}
}
else if (*px_p == dcolor) {
*px_p = (Uint8)rcolor;
}
pixel_p += stride0;
}
pixelrow += stride1;
}
} break;
case 2: {
Uint16 *px_p;
int ppa =
(SDL_ISPIXELFORMAT_ALPHA(format->format) && format->Amask);
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
for (x = 0; x < dim0; ++x) {
px_p = (Uint16 *)pixel_p;
if (distance != 0.0) {
GET_PIXELVALS(r2, g2, b2, a2, (Uint32)*px_p, format,
ppa);
if (COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2,
b2) <= distance) {
*px_p = (Uint16)rcolor;
}
}
else if (*px_p == dcolor) {
*px_p = (Uint16)rcolor;
}
pixel_p += stride0;
}
pixelrow += stride1;
}
} break;
case 3: {
#if (SDL_BYTEORDER == SDL_LIL_ENDIAN)
Uint32 Roffset = format->Rshift >> 3;
Uint32 Goffset = format->Gshift >> 3;
Uint32 Boffset = format->Bshift >> 3;
#else
Uint32 Roffset = 2 - (format->Rshift >> 3);
Uint32 Goffset = 2 - (format->Gshift >> 3);
Uint32 Boffset = 2 - (format->Bshift >> 3);
#endif
Uint32 pxcolor;
int ppa =
(SDL_ISPIXELFORMAT_ALPHA(format->format) && format->Amask);
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
for (x = 0; x < dim0; ++x) {
pxcolor = (((Uint32)pixel_p[Roffset] << 16) +
((Uint32)pixel_p[Goffset] << 8) +
((Uint32)pixel_p[Boffset]));
if (distance != 0.0) {
GET_PIXELVALS(r2, g2, b2, a2, pxcolor, format, ppa);
if (COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2,
b2) <= distance) {
pixel_p[Roffset] = (Uint8)(rcolor >> 16);
pixel_p[Goffset] = (Uint8)(rcolor >> 8);
pixel_p[Boffset] = (Uint8)rcolor;
}
}
else if (pxcolor == dcolor) {
pixel_p[Roffset] = (Uint8)(rcolor >> 16);
pixel_p[Goffset] = (Uint8)(rcolor >> 8);
pixel_p[Boffset] = (Uint8)rcolor;
}
pixel_p += stride0;
}
pixelrow += stride1;
}
} break;
default: /* case 4: */
{
Uint32 *px_p;
int ppa = (SDL_ISPIXELFORMAT_ALPHA(format->format) &&
surf->format->Amask);
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
for (x = 0; x < dim0; ++x) {
px_p = (Uint32 *)pixel_p;
if (distance != 0.0) {
GET_PIXELVALS(r2, g2, b2, a2, *px_p, format, ppa);
if (COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2,
b2) <= distance) {
*px_p = rcolor;
}
}
else if (*px_p == dcolor) {
*px_p = rcolor;
}
pixel_p += stride0;
}
pixelrow += stride1;
}
} break;
}
Py_END_ALLOW_THREADS;
Py_RETURN_NONE;
}
static PyObject *
_extract_color(pgPixelArrayObject *array, PyObject *args, PyObject *kwds)
{
PyObject *weights = 0;
PyObject *excolor = 0;
int bpp;
Uint32 black;
Uint32 white;
Uint32 color;
Uint8 r1, g1, b1, r2, g2, b2, a2;
Uint8 *pixelrow;
Uint8 *pixel_p;
float distance = 0;
float wr, wg, wb;
Py_ssize_t x;
Py_ssize_t y;
PyObject *surface;
SDL_Surface *surf;
SDL_PixelFormat *format;
pgPixelArrayObject *new_array;
Py_ssize_t dim0;
Py_ssize_t dim1;
Py_ssize_t stride0;
Py_ssize_t stride1;
Uint8 *pixels;
static char *keys[] = {"color", "distance", "weights", NULL};
if (array->surface == NULL) {
return RAISE(PyExc_ValueError, "Operation on closed PixelArray.");
}
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|fO", keys, &excolor,
&distance, &weights)) {
return 0;
}
if (distance < 0 || distance > 1) {
return RAISE(PyExc_ValueError,
"distance must be in the range from 0.0 to 1.0");
}
if (!_get_weights(weights, &wr, &wg, &wb)) {
return 0;
}
/* Create the b/w mask surface. */
surface = _make_surface(array, NULL);
if (!surface) {
return 0;
}
new_array = (pgPixelArrayObject *)pgPixelArray_New(surface);
Py_DECREF(surface);
if (!new_array) {
return 0;
}
surf = pgSurface_AsSurface(surface);
format = surf->format;
bpp = PG_SURF_BytesPerPixel(surf);
dim0 = new_array->shape[0];
dim1 = new_array->shape[1];
stride0 = new_array->strides[0];
stride1 = new_array->strides[1];
pixels = new_array->pixels;
black = SDL_MapRGBA(format, 0, 0, 0, 255);
white = SDL_MapRGBA(format, 255, 255, 255, 255);
if (!_get_color_from_object(excolor, surf, &color)) {
Py_DECREF(new_array);
return 0;
}
if (distance != 0.0) {
SDL_GetRGB(color, format, &r1, &g1, &b1);
}
if (!dim1) {
dim1 = 1;
}
pixelrow = pixels;
Py_BEGIN_ALLOW_THREADS;
switch (bpp) {
case 1: {
Uint8 *px_p;
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
for (x = 0; x < dim0; ++x) {
px_p = pixel_p;
if (distance != 0.0) {
GET_PIXELVALS_1(r2, g2, b2, a2, px_p, format);
if (COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2,
b2) <= distance) {
*px_p = (Uint8)white;
}
else {
*px_p = (Uint8)black;
}
}
else {
*px_p = (Uint8)(*px_p == color ? white : black);
}
pixel_p += stride0;
}
pixelrow += stride1;
}
} break;
case 2: {
Uint16 *px_p;
int ppa =
(SDL_ISPIXELFORMAT_ALPHA(format->format) && format->Amask);
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
for (x = 0; x < dim0; ++x) {
px_p = (Uint16 *)pixel_p;
if (distance != 0.0) {
GET_PIXELVALS(r2, g2, b2, a2, (Uint32)*px_p, format,
ppa);
if (COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2,
b2) <= distance) {
*px_p = (Uint16)white;
}
else {
*px_p = (Uint16)black;
}
}
else {
*px_p = (Uint16)(*px_p == color ? white : black);
}
pixel_p += stride0;
}
pixelrow += stride1;
}
} break;
case 3: {
#if (SDL_BYTEORDER == SDL_LIL_ENDIAN)
Uint32 Roffset = format->Rshift >> 3;
Uint32 Goffset = format->Gshift >> 3;
Uint32 Boffset = format->Bshift >> 3;
#else
Uint32 Roffset = 2 - (format->Rshift >> 3);
Uint32 Goffset = 2 - (format->Gshift >> 3);
Uint32 Boffset = 2 - (format->Bshift >> 3);
#endif
Uint8 white_r = (Uint8)(white >> 16);
Uint8 white_g = (Uint8)(white >> 8);
Uint8 white_b = (Uint8)white;
Uint8 black_r = (Uint8)(black >> 16);
Uint8 black_g = (Uint8)(black >> 8);
Uint8 black_b = (Uint8)black;
Uint32 pxcolor;
int ppa =
(SDL_ISPIXELFORMAT_ALPHA(format->format) && format->Amask);
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
for (x = 0; x < dim0; ++x) {
pxcolor = (((Uint32)pixel_p[Roffset] << 16) +
((Uint32)pixel_p[Goffset] << 8) +
((Uint32)pixel_p[Boffset]));
if (distance != 0.0) {
GET_PIXELVALS(r2, g2, b2, a2, pxcolor, format, ppa);
if (COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2,
b2) <= distance) {
pixel_p[Roffset] = white_r;
pixel_p[Goffset] = white_g;
pixel_p[Boffset] = white_b;
}
else {
pixel_p[Roffset] = black_r;
pixel_p[Goffset] = black_g;
pixel_p[Boffset] = black_b;
}
}
else if (pxcolor == color) {
pixel_p[Roffset] = white_r;
pixel_p[Goffset] = white_g;
pixel_p[Boffset] = white_b;
}
else {
pixel_p[Roffset] = black_r;
pixel_p[Goffset] = black_g;
pixel_p[Boffset] = black_b;
}
pixel_p += stride0;
}
pixelrow += stride1;
}
} break;
default: /* case 4: */
{
Uint32 *px_p;
int ppa =
(SDL_ISPIXELFORMAT_ALPHA(format->format) && format->Amask);
for (y = 0; y < dim1; ++y) {
pixel_p = pixelrow;
for (x = 0; x < dim0; ++x) {
px_p = (Uint32 *)pixel_p;
if (distance != 0.0) {
GET_PIXELVALS(r2, g2, b2, a2, *px_p, format, ppa);
if (COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2,
b2) <= distance) {
*px_p = white;
}
else {
*px_p = black;
}
}
else {
*px_p = *px_p == color ? white : black;
}
pixel_p += stride0;
}
pixelrow += stride1;
}
} break;
}
Py_END_ALLOW_THREADS;
return (PyObject *)new_array;
}
static PyObject *
_compare(pgPixelArrayObject *array, PyObject *args, PyObject *kwds)
{
Py_ssize_t dim0 = array->shape[0];
Py_ssize_t dim1 = array->shape[1];
SDL_Surface *surf;
SDL_PixelFormat *format;
pgPixelArrayObject *other_array;
PyObject *weights = 0;
SDL_Surface *other_surf;
SDL_PixelFormat *other_format;
Py_ssize_t other_stride0;
Py_ssize_t other_stride1;
Uint8 *other_pixels;
int bpp;
Uint32 black;
Uint32 white;
Uint8 r1, g1, b1, a1, r2, g2, b2, a2;
Uint8 *row_p;
Uint8 *byte_p;
Uint8 *other_row_p;
Uint8 *other_byte_p;
float distance = 0;
float wr, wg, wb;
Py_ssize_t x;
Py_ssize_t y;
pgPixelArrayObject *new_array;
PyObject *new_surface;
SDL_PixelFormat *new_format;
Py_ssize_t stride0;
Py_ssize_t stride1;
Uint8 *pixels;
static char *keys[] = {"array", "distance", "weights", NULL};
if (array->surface == NULL) {
return RAISE(PyExc_ValueError, "Operation on closed PixelArray.");
}
surf = pgSurface_AsSurface(array->surface);
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O!|fO", keys,
&pgPixelArray_Type, &other_array,
&distance, &weights)) {
return 0;
}
if (distance < 0.0 || distance > 1.0) {
return RAISE(PyExc_ValueError,
"distance must be in the range from 0.0 to 1.0");
}
if (!_get_weights(weights, &wr, &wg, &wb)) {
return 0;
}
if (other_array->shape[0] != dim0 || other_array->shape[1] != dim1) {
/* Bounds do not match. */
PyErr_SetString(PyExc_ValueError, "array sizes do not match");
return 0;
}
format = surf->format;
bpp = PG_SURF_BytesPerPixel(surf);
other_surf = pgSurface_AsSurface(other_array->surface);
other_format = other_surf->format;
if (PG_FORMAT_BytesPerPixel(other_format) != bpp) {
/* bpp do not match. We cannot guarantee that the padding and co
* would be set correctly. */
PyErr_SetString(PyExc_ValueError, "bit depths do not match");
return 0;
}
other_stride0 = other_array->strides[0];
other_stride1 = other_array->strides[1];
other_pixels = other_array->pixels;
/* Create the b/w mask surface. */
new_surface = _make_surface(array, NULL);
if (!new_surface) {
return 0;
}
new_array = (pgPixelArrayObject *)pgPixelArray_New(new_surface);
Py_DECREF(new_surface);
if (!new_array) {
return 0;
}
new_format = surf->format;
stride0 = new_array->strides[0];
stride1 = new_array->strides[1];
pixels = new_array->pixels;
black = SDL_MapRGBA(format, 0, 0, 0, 255);
white = SDL_MapRGBA(format, 255, 255, 255, 255);
Py_BEGIN_ALLOW_THREADS;
if (!dim1) {
dim1 = 1;
}
row_p = pixels;
other_row_p = other_pixels;
switch (bpp) {
case 1: {
Uint8 *pixel_p;
Uint8 *other_pixel_p;
for (y = 0; y < dim1; ++y) {
byte_p = row_p;
other_byte_p = other_row_p;
for (x = 0; x < dim0; ++x) {
pixel_p = byte_p;
other_pixel_p = other_byte_p;
if (distance != 0.0) {
GET_PIXELVALS_1(r1, g1, b1, a1, pixel_p, new_format);
GET_PIXELVALS_1(r2, g2, b2, a2, other_pixel_p,
other_format);
if (COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2,
b2) <= distance) {
*pixel_p = (Uint8)white;
}
else {
*pixel_p = (Uint8)black;
}
}
else {
*pixel_p = (Uint8)(*pixel_p == *other_pixel_p ? white
: black);
}
byte_p += stride0;
other_byte_p += other_stride0;
}
row_p += stride1;
other_row_p += other_stride1;
}
} break;
case 2: {
Uint16 *pixel_p;
Uint16 *other_pixel_p;
int ppa =
(SDL_ISPIXELFORMAT_ALPHA(format->format) && format->Amask);
int other_ppa = (SDL_ISPIXELFORMAT_ALPHA(other_format->format) &&
other_format->Amask);
for (y = 0; y < dim1; ++y) {
byte_p = row_p;
other_byte_p = other_row_p;
for (x = 0; x < dim0; ++x) {
pixel_p = (Uint16 *)byte_p;
other_pixel_p = (Uint16 *)other_byte_p;
if (distance != 0.0) {
GET_PIXELVALS(r1, g1, b1, a1, (Uint32)*pixel_p, format,
ppa);
GET_PIXELVALS(r2, g2, b2, a2, (Uint32)*other_pixel_p,
other_format, other_ppa);
if (COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2,
b2) <= distance) {
*pixel_p = (Uint16)white;
}
else {
*pixel_p = (Uint16)black;
}
}
else {
*pixel_p =
(Uint16)(*pixel_p == *other_pixel_p ? white
: black);
}
byte_p += stride0;
other_byte_p += other_stride0;
}
row_p += stride1;
other_row_p += other_stride1;
}
} break;
case 3: {
#if (SDL_BYTEORDER == SDL_LIL_ENDIAN)
Uint32 Roffset = format->Rshift >> 3;
Uint32 Goffset = format->Gshift >> 3;
Uint32 Boffset = format->Bshift >> 3;
Uint32 oRoffset = other_format->Rshift >> 3;
Uint32 oGoffset = other_format->Gshift >> 3;
Uint32 oBoffset = other_format->Bshift >> 3;
#else
Uint32 Roffset = 2 - (format->Rshift >> 3);
Uint32 Goffset = 2 - (format->Gshift >> 3);
Uint32 Boffset = 2 - (format->Bshift >> 3);
Uint32 oRoffset = 2 - (other_format->Rshift >> 3);
Uint32 oGoffset = 2 - (other_format->Gshift >> 3);
Uint32 oBoffset = 2 - (other_format->Bshift >> 3);
#endif
Uint8 white_r = (Uint8)(white >> 16);
Uint8 white_g = (Uint8)(white >> 8);
Uint8 white_b = (Uint8)white;
Uint8 black_r = (Uint8)(black >> 16);
Uint8 black_g = (Uint8)(black >> 8);
Uint8 black_b = (Uint8)black;
for (y = 0; y < dim1; ++y) {
byte_p = row_p;
other_byte_p = other_row_p;
for (x = 0; x < dim0; ++x) {
r1 = byte_p[Roffset];
g1 = byte_p[Goffset];
b1 = byte_p[Boffset];
r2 = other_byte_p[oRoffset];
g2 = other_byte_p[oGoffset];
b2 = other_byte_p[oBoffset];
if (distance != 0.0) {
if (COLOR_DIFF_RGB(wr, wg, wb, r1, g1, b1, r2, g2,
b2) <= distance) {
byte_p[Roffset] = white_r;
byte_p[Goffset] = white_g;
byte_p[Boffset] = white_b;
}
else {
byte_p[Roffset] = black_r;
byte_p[Goffset] = black_g;
byte_p[Boffset] = black_b;
}
}
else if (r1 == r2 && g1 == g2 && b1 == b2) {
byte_p[Roffset] = white_r;
byte_p[Goffset] = white_g;
byte_p[Boffset] = white_b;
}
else {
byte_p[Roffset] = black_r;
byte_p[Goffset] = black_g;
byte_p[Boffset] = black_b;
}
byte_p += stride0;
other_byte_p += other_stride0;
}
row_p += stride1;
other_row_p += other_stride1;
}
} break;
default: /* case 4: */
{
Uint32 *pixel_p;
Uint32 *other_pixel_p;
int ppa =
(SDL_ISPIXELFORMAT_ALPHA(format->format) && format->Amask);
int other_ppa = (SDL_ISPIXELFORMAT_ALPHA(other_format->format) &&
other_format->Amask);
for (y = 0; y < dim1; ++y) {
byte_p = row_p;
other_byte_p = other_row_p;
for (x = 0; x < dim0; ++x) {
pixel_p = (Uint32 *)byte_p;
other_pixel_p = (Uint32 *)other_byte_p;
if (distance != 0.0) {
GET_PIXELVALS(r1, g1, b1, a1, *pixel_p, format, ppa);
GET_PIXELVALS(r2, g2, b2, a2, *other_pixel_p,
other_format, other_ppa);