/
image.c
1820 lines (1675 loc) 路 60.4 KB
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image.c
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/*
pygame - Python Game Library
Copyright (C) 2000-2001 Pete Shinners
Copyright (C) 2006 Rene Dudfield
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
*/
/*
* image module for pygame
*/
#include "pygame.h"
#include "pgcompat.h"
#include "doc/image_doc.h"
#if PG_COMPILE_SSE4_2 && SDL_VERSION_ATLEAST(2, 0, 0)
#include <emmintrin.h>
/* SSSE 3 */
#include <tmmintrin.h>
#endif
#if IS_SDLv1
#include "pgopengl.h"
#endif /* IS_SDLv1 */
struct _module_state {
int is_extended;
};
#if PY3
#define GETSTATE(m) PY3_GETSTATE(_module_state, m)
#else
static struct _module_state _state = {0};
#define GETSTATE(m) PY2_GETSTATE(_state)
#endif
static int
SaveTGA(SDL_Surface *surface, const char *file, int rle);
static int
SaveTGA_RW(SDL_Surface *surface, SDL_RWops *out, int rle);
#if IS_SDLv1
static SDL_Surface *
opengltosdl(void);
#endif /* IS_SDLv1 */
#define DATAROW(data, row, width, height, flipped) \
((flipped) ? (((char *)data) + (height - row - 1) * width) \
: (((char *)data) + row * width))
static const char *
find_extension(const char *fullname)
{
const char *dot;
if (fullname == NULL) {
return NULL;
}
dot = strrchr(fullname, '.');
if (dot == NULL) {
return fullname;
}
return dot + 1;
}
static PyObject *
image_load_basic(PyObject *self, PyObject *arg)
{
PyObject *obj;
PyObject *final;
PyObject *oencoded;
const char *name = NULL;
SDL_Surface *surf;
if (!PyArg_ParseTuple(arg, "O|s", &obj, &name)) {
return NULL;
}
oencoded = pg_EncodeString(obj, "UTF-8", NULL, pgExc_SDLError);
if (oencoded == NULL) {
return NULL;
}
if (oencoded != Py_None) {
Py_BEGIN_ALLOW_THREADS;
surf = SDL_LoadBMP(Bytes_AS_STRING(oencoded));
Py_END_ALLOW_THREADS;
Py_DECREF(oencoded);
}
else {
SDL_RWops *rw;
Py_DECREF(oencoded);
rw = pgRWops_FromFileObject(obj);
if (rw == NULL) {
return NULL;
}
Py_BEGIN_ALLOW_THREADS;
surf = SDL_LoadBMP_RW(rw, 1);
Py_END_ALLOW_THREADS;
}
if (surf == NULL) {
return RAISE(pgExc_SDLError, SDL_GetError());
}
final = (PyObject *)pgSurface_New(surf);
if (final == NULL) {
SDL_FreeSurface(surf);
}
return final;
}
#if IS_SDLv1
static SDL_Surface *
opengltosdl()
{
/*we need to get ahold of the pyopengl glReadPixels function*/
/*we use pyopengl's so we don't need to link with opengl at compiletime*/
SDL_Surface *surf = NULL;
Uint32 rmask, gmask, bmask;
int i;
unsigned char *pixels = NULL;
GL_glReadPixels_Func p_glReadPixels = NULL;
p_glReadPixels =
(GL_glReadPixels_Func)SDL_GL_GetProcAddress("glReadPixels");
surf = SDL_GetVideoSurface();
if (!surf) {
return (SDL_Surface *)RAISE(PyExc_RuntimeError,
"Cannot get video surface.");
}
if (!p_glReadPixels) {
return (SDL_Surface *)RAISE(PyExc_RuntimeError,
"Cannot find glReadPixels function.");
}
/*
GL_UNSIGNED_BYTE = 5121
GL_RGB = 6407
*/
pixels = (unsigned char *)malloc(surf->w * surf->h * 3);
if (!pixels) {
return (SDL_Surface *)RAISE(
PyExc_MemoryError,
"Cannot allocate enough memory for pixels.");
}
// p_glReadPixels(0, 0, surf->w, surf->h, 6407, 5121, pixels);
// glReadPixels(0, 0, surf->w, surf->h, 0x1907, 0x1401, pixels);
p_glReadPixels(0, 0, surf->w, surf->h, 0x1907, 0x1401, pixels);
if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {
rmask = 0x000000FF;
gmask = 0x0000FF00;
bmask = 0x00FF0000;
}
else {
rmask = 0x00FF0000;
gmask = 0x0000FF00;
bmask = 0x000000FF;
}
surf = SDL_CreateRGBSurface(SDL_SWSURFACE, surf->w, surf->h, 24, rmask,
gmask, bmask, 0);
if (!surf) {
free(pixels);
return (SDL_Surface *)RAISE(pgExc_SDLError, SDL_GetError());
}
for (i = 0; i < surf->h; ++i) {
memcpy(((char *)surf->pixels) + surf->pitch * i,
pixels + 3 * surf->w * (surf->h - i - 1), surf->w * 3);
}
free(pixels);
return surf;
}
#endif /* IS_SDLv1 */
#ifdef WIN32
#define strcasecmp _stricmp
#else
#include <strings.h>
#endif
PyObject *
image_save(PyObject *self, PyObject *arg)
{
pgSurfaceObject *surfobj;
PyObject *obj;
const char *namehint = NULL;
PyObject *oencoded;
PyObject *imgext = NULL;
SDL_Surface *surf;
int result = 1;
#if IS_SDLv1
SDL_Surface *temp = NULL;
#endif /* IS_SDLv1 */
if (!PyArg_ParseTuple(arg, "O!O|s", &pgSurface_Type, &surfobj,
&obj, &namehint)) {
return NULL;
}
surf = pgSurface_AsSurface(surfobj);
#if IS_SDLv1
if (surf->flags & SDL_OPENGL) {
temp = surf = opengltosdl();
if (surf == NULL) {
return NULL;
}
}
else {
pgSurface_Prep(surfobj);
}
#else /* IS_SDLv2 */
pgSurface_Prep(surfobj);
#endif /* IS_SDLv2 */
oencoded = pg_EncodeString(obj, "UTF-8", NULL, pgExc_SDLError);
if (oencoded == NULL) {
result = -2;
}
else {
const char *name = NULL;
const char * ext = NULL;
if (oencoded == Py_None) {
name = (namehint ? namehint: "tga");
}
else {
name = Bytes_AS_STRING(oencoded);
}
ext = find_extension(name);
if (!strcasecmp(ext, "png") ||
!strcasecmp(ext, "jpg") ||
!strcasecmp(ext, "jpeg")) {
/* If it is .png .jpg .jpeg use the extended module. */
/* try to get extended formats */
imgext = PyImport_ImportModule(IMPPREFIX "imageext");
if (imgext != NULL) {
PyObject *extsave =
PyObject_GetAttrString(imgext, "save_extended");
Py_DECREF(imgext);
if (extsave != NULL) {
PyObject *data = PyObject_CallObject(extsave, arg);
Py_DECREF(extsave);
if (data == NULL) {
result = -2;
}
else {
Py_DECREF(data);
result = 0;
}
}
else {
result = -2;
}
}
else {
result = -2;
}
}
else if (oencoded == Py_None) {
SDL_RWops *rw = pgRWops_FromFileObject(obj);
if (rw != NULL) {
if (!strcasecmp(ext, "bmp")) {
/* The SDL documentation didn't specify which negative number
* is returned upon error. We want to be sure that result is
* either 0 or -1: */
result = (SDL_SaveBMP_RW(surf, rw, 0) == 0 ? 0 : -1);
}
else {
result = SaveTGA_RW(surf, rw, 1);
}
}
else {
result = -2;
}
}
else {
if (!strcasecmp(ext, "bmp")) {
Py_BEGIN_ALLOW_THREADS;
/* The SDL documentation didn't specify which negative number
* is returned upon error. We want to be sure that result is
* either 0 or -1: */
result = (SDL_SaveBMP(surf, name) == 0 ? 0 : -1);
Py_END_ALLOW_THREADS;
}
else {
Py_BEGIN_ALLOW_THREADS;
result = SaveTGA(surf, name, 1);
Py_END_ALLOW_THREADS;
}
}
}
Py_XDECREF(oencoded);
#if IS_SDLv1
if (temp) {
SDL_FreeSurface(temp);
}
else {
pgSurface_Unprep(surfobj);
}
#else /* IS_SDLv2 */
pgSurface_Unprep(surfobj);
#endif /* IS_SDLv2 */
if (result == -2) {
/* Python error raised elsewhere */
return NULL;
}
if (result == -1) {
/* SDL error: translate to Python error */
return RAISE(pgExc_SDLError, SDL_GetError());
}
if (result == 1) {
/* Should never get here */
return RAISE(pgExc_SDLError, "Unrecognized image type");
}
Py_RETURN_NONE;
}
static PyObject *
image_get_sdl_image_version_none(PyObject *self, PyObject *arg)
{
/* If the extended formats can't be imported, then no SDL_Image is used.
* get_sdl_image_version() will then point to this function which will
* allways return None.
*/
Py_RETURN_NONE;
}
PyObject *
image_get_extended(PyObject *self, PyObject *arg)
{
return PyInt_FromLong(GETSTATE(self)->is_extended);
}
#if PG_COMPILE_SSE4_2 && SDL_VERSION_ATLEAST(2, 0, 0)
#define SSE42_ALIGN_NEEDED 16
#define SSE42_ALIGN __attribute__((aligned(SSE42_ALIGN_NEEDED)))
#define _SHIFT_N_STEP2ALIGN(shift, step) (shift/8 + step * 4)
#if PYGAME_DEBUG_SSE
/* Useful for debugging/comparing the SSE vectors */
static void _debug_print128_num(__m128i var, const char *msg)
{
uint32_t val[4];
memcpy(val, &var, sizeof(val));
fprintf(stderr, "%s: %04x%04x%04x%04x\n",
msg, val[0], val[1], val[2], val[3]);
}
#define DEBUG_PRINT128_NUM(var, msg) _debug_print128_num(var, msg)
#else
#define DEBUG_PRINT128_NUM(var, msg) do { /* do nothing */ } while (0)
#endif
/*
* Generates an SSE vector useful for reordering a SSE vector
* based on the "in-memory layout" to match the "tostring layout"
* It is only useful as second parameter to _mm_shuffle_epi8.
*
* A short _mm_shuffle_epi8 primer:
*
* - If the highest bit of a byte in the reorder vector is set,
* the matching byte in the original vector is cleared:
* - Otherwise, the 3 lowest bit of the byte in the reorder vector
* represent the byte index of where to find the relevant value
* from the original vector.
*
* As an example, given the following in memory layout (bytes):
*
* R1 G1 B1 A1 R2 G2 B2 A2 ...
*
* And we want:
*
* A1 R1 G1 B1 A2 R2 G2 B2
*
* Then the reorder vector should look like (in hex):
*
* 03 00 01 02 07 04 05 06
*
* This is exactly the type of vector that compute_align_vector
* produces (based on the pixel format and where the alpha should
* be placed in the output).
*/
static PG_INLINE __m128i
compute_align_vector(SDL_PixelFormat *format, int color_offset,
int alpha_offset) {
int output_align[4];
size_t i;
size_t limit = sizeof(output_align) / sizeof(int);
int a_shift = alpha_offset * 8;
int r_shift = (color_offset + 0) * 8;
int g_shift = (color_offset + 1) * 8;
int b_shift = (color_offset + 2) * 8;
for (i = 0; i < limit; i++) {
int p = 3 - i;
output_align[i] = _SHIFT_N_STEP2ALIGN(format->Rshift, p) << r_shift
| _SHIFT_N_STEP2ALIGN(format->Gshift, p) << g_shift
| _SHIFT_N_STEP2ALIGN(format->Bshift, p) << b_shift
| _SHIFT_N_STEP2ALIGN(format->Ashift, p) << a_shift;
}
return _mm_set_epi32(output_align[0], output_align[1],
output_align[2], output_align[3]);
}
static PG_INLINE PG_FUNCTION_TARGET_SSE4_2 void
tostring_pixels_32bit_sse4(const __m128i *row, __m128i *data, int loop_max,
__m128i mask_vector, __m128i align_vector) {
int w;
for (w = 0; w < loop_max; ++w) {
__m128i pvector = _mm_loadu_si128(row + w);
DEBUG_PRINT128_NUM(pvector, "Load");
pvector = _mm_and_si128(pvector, mask_vector);
DEBUG_PRINT128_NUM(pvector, "after _mm_and_si128 (and)");
pvector = _mm_shuffle_epi8(pvector, align_vector);
DEBUG_PRINT128_NUM(pvector, "after _mm_shuffle_epi8 (reorder)");
_mm_storeu_si128(data + w, pvector);
}
}
/*
* SSE4.2 variant of tostring_surf_32bpp.
*
* It is a lot faster but only works on a subset of the surfaces
* (plus requires SSE4.2 support from the CPU).
*/
static PG_FUNCTION_TARGET_SSE4_2 void
tostring_surf_32bpp_sse42(SDL_Surface *surf, int flipped, char *data,
int color_offset, int alpha_offset) {
const int step_size = 4;
int h;
SDL_PixelFormat *format = surf->format;
int loop_max = surf->w / step_size;
int mask = (format->Rloss ? 0 : format->Rmask)
| (format->Gloss ? 0 : format->Gmask)
| (format->Bloss ? 0 : format->Bmask)
| (format->Aloss ? 0 : format->Amask);
__m128i mask_vector = _mm_set_epi32(mask, mask, mask, mask);
__m128i align_vector = compute_align_vector(surf->format,
color_offset, alpha_offset);
/* How much we would overshoot if we overstep loop_max */
int rollback_count = surf->w % step_size;
if (rollback_count) {
rollback_count = step_size - rollback_count;
}
DEBUG_PRINT128_NUM(mask_vector, "mask-vector");
DEBUG_PRINT128_NUM(align_vector, "align-vector");
/* This code will be horribly wrong if these assumptions do not hold.
* They are intended as a debug/testing guard to ensure that nothing
* calls this function without ensuring the assumptions during
* development
*/
assert(sizeof(int) == sizeof(Uint32));
assert(4 * sizeof(Uint32) == sizeof(__m128i));
/* If this assertion does not hold, the fallback code will overrun
* the buffers.
*/
assert(surf->w >= step_size);
assert(format->Rloss % 8 == 0);
assert(format->Gloss % 8 == 0);
assert(format->Bloss % 8 == 0);
assert(format->Aloss % 8 == 0);
for (h = 0; h < surf->h; ++h) {
const char *row = (char *)DATAROW(
surf->pixels, h, surf->pitch, surf->h, flipped);
tostring_pixels_32bit_sse4((const __m128i*)row, (__m128i *)data,
loop_max, mask_vector, align_vector);
row += sizeof(__m128i) * loop_max;
data += sizeof(__m128i) * loop_max;
if (rollback_count) {
/* Back up a bit to ensure we stay within the memory boundaries
* Technically, we end up redoing part of the computations, but
* it does not really matter as the runtime of these operations
* are fixed and the results are deterministic.
*/
row -= rollback_count * sizeof(Uint32);
data -= rollback_count * sizeof(Uint32);
tostring_pixels_32bit_sse4((const __m128i*)row, (__m128i *)data,
1, mask_vector, align_vector);
row += sizeof(__m128i);
data += sizeof(__m128i);
}
}
}
#endif /* PG_COMPILE_SSE4_2 && SDL_VERSION_ATLEAST(2, 0, 0) */
#if IS_SDLv2
static void
tostring_surf_32bpp(SDL_Surface *surf, int flipped,
int hascolorkey, Uint32 colorkey,
char *serialized_image,
int color_offset, int alpha_offset
)
#else
static void
tostring_surf_32bpp(SDL_Surface *surf, int flipped,
int hascolorkey, int colorkey,
char *serialized_image,
int color_offset, int alpha_offset
)
#endif /* !IS_SDLv2*/
{
int w, h;
Uint32 Rmask = surf->format->Rmask;
Uint32 Gmask = surf->format->Gmask;
Uint32 Bmask = surf->format->Bmask;
Uint32 Amask = surf->format->Amask;
Uint32 Rshift = surf->format->Rshift;
Uint32 Gshift = surf->format->Gshift;
Uint32 Bshift = surf->format->Bshift;
Uint32 Ashift = surf->format->Ashift;
Uint32 Rloss = surf->format->Rloss;
Uint32 Gloss = surf->format->Gloss;
Uint32 Bloss = surf->format->Bloss;
Uint32 Aloss = surf->format->Aloss;
#if PG_COMPILE_SSE4_2 && SDL_VERSION_ATLEAST(2, 0, 0)
if (/* SDL uses Uint32, SSE uses int for building vectors.
* Related, we assume that Uint32 is packed so 4 of
* them perfectly matches an __m128i.
* If these assumptions do not match up, we will
* produce incorrect results.
*/
sizeof(int) == sizeof(Uint32)
&& 4 * sizeof(Uint32) == sizeof(__m128i)
&& !hascolorkey /* No color key */
&& SDL_HasSSE42() == SDL_TRUE
/* The SSE code assumes it will always read at least 4 pixels */
&& surf->w >= 4
/* Our SSE code assumes masks are at most 0xff */
&& (surf->format->Rmask >> surf->format->Rshift) <= 0x0ff
&& (surf->format->Gmask >> surf->format->Gshift) <= 0x0ff
&& (surf->format->Bmask >> surf->format->Bshift) <= 0x0ff
&& (Amask >> Ashift) <= 0x0ff
/* Our SSE code cannot handle losses other than 0 or 8
* Note the mask check above ensures that losses can be
* at most be 8 (assuming the pixel format makes sense
* at all).
*/
&& (surf->format->Rloss % 8) == 0
&& (surf->format->Bloss % 8) == 0
&& (surf->format->Gloss % 8) == 0
&& (Aloss % 8) == 0
) {
tostring_surf_32bpp_sse42(surf, flipped, serialized_image,
color_offset, alpha_offset);
return;
}
#endif /* PG_COMPILE_SSE4_2 && SDL_VERSION_ATLEAST(2, 0, 0) */
for (h = 0; h < surf->h; ++h) {
Uint32 *pixel_row = (Uint32 *)DATAROW(
surf->pixels, h, surf->pitch, surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
Uint32 color = *pixel_row++;
serialized_image[color_offset + 0] =
(char)(((color & Rmask) >> Rshift) << Rloss);
serialized_image[color_offset + 1] =
(char)(((color & Gmask) >> Gshift) << Gloss);
serialized_image[color_offset + 2] =
(char)(((color & Bmask) >> Bshift) << Bloss);
serialized_image[alpha_offset] =
hascolorkey
? (char)(color != colorkey) * 255
: (char)(Amask ? (((color & Amask) >> Ashift)
<< Aloss)
: 255);
serialized_image += 4;
}
}
}
PyObject *
image_tostring(PyObject *self, PyObject *arg)
{
pgSurfaceObject *surfobj = NULL;
PyObject *string = NULL;
char *format, *data, *pixels;
SDL_Surface *surf;
int w, h, flipped = 0;
Py_ssize_t len;
Uint32 Rmask, Gmask, Bmask, Amask, Rshift, Gshift, Bshift, Ashift, Rloss,
Gloss, Bloss, Aloss;
int hascolorkey;
#if IS_SDLv1
SDL_Surface *temp = NULL;
int color, colorkey;
#else /* IS_SDLv2 */
Uint32 color, colorkey;
#endif /* IS_SDLv2 */
Uint32 alpha;
if (!PyArg_ParseTuple(arg, "O!s|i", &pgSurface_Type, &surfobj, &format,
&flipped))
return NULL;
surf = pgSurface_AsSurface(surfobj);
#if IS_SDLv1
if (surf->flags & SDL_OPENGL) {
temp = surf = opengltosdl();
if (!surf)
return NULL;
}
#endif /* IS_SDLv1 */
Rmask = surf->format->Rmask;
Gmask = surf->format->Gmask;
Bmask = surf->format->Bmask;
Amask = surf->format->Amask;
Rshift = surf->format->Rshift;
Gshift = surf->format->Gshift;
Bshift = surf->format->Bshift;
Ashift = surf->format->Ashift;
Rloss = surf->format->Rloss;
Gloss = surf->format->Gloss;
Bloss = surf->format->Bloss;
Aloss = surf->format->Aloss;
#if IS_SDLv1
hascolorkey = (surf->flags & SDL_SRCCOLORKEY) && !Amask;
colorkey = surf->format->colorkey;
#else /* IS_SDLv2 */
hascolorkey = (SDL_GetColorKey(surf, &colorkey) == 0);
#endif /* IS_SDLv2 */
if (!strcmp(format, "P")) {
if (surf->format->BytesPerPixel != 1)
return RAISE(
PyExc_ValueError,
"Can only create \"P\" format data with 8bit Surfaces");
string = Bytes_FromStringAndSize(NULL, (Py_ssize_t)surf->w * surf->h);
if (!string)
return NULL;
Bytes_AsStringAndSize(string, &data, &len);
pgSurface_Lock(surfobj);
pixels = (char *)surf->pixels;
for (h = 0; h < surf->h; ++h)
memcpy(DATAROW(data, h, surf->w, surf->h, flipped),
pixels + (h * surf->pitch), surf->w);
pgSurface_Unlock(surfobj);
}
else if (!strcmp(format, "RGB")) {
string =
Bytes_FromStringAndSize(NULL, (Py_ssize_t)surf->w * surf->h * 3);
if (!string)
return NULL;
Bytes_AsStringAndSize(string, &data, &len);
#if IS_SDLv1
if (!temp)
pgSurface_Lock(surfobj);
#else /* IS_SDLv2 */
pgSurface_Lock(surfobj);
#endif /* IS_SDLv2 */
pixels = (char *)surf->pixels;
switch (surf->format->BytesPerPixel) {
case 1:
for (h = 0; h < surf->h; ++h) {
Uint8 *ptr = (Uint8 *)DATAROW(surf->pixels, h, surf->pitch,
surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
color = *ptr++;
data[0] = (char)surf->format->palette->colors[color].r;
data[1] = (char)surf->format->palette->colors[color].g;
data[2] = (char)surf->format->palette->colors[color].b;
data += 3;
}
}
break;
case 2:
for (h = 0; h < surf->h; ++h) {
Uint16 *ptr = (Uint16 *)DATAROW(
surf->pixels, h, surf->pitch, surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
color = *ptr++;
data[0] = (char)(((color & Rmask) >> Rshift) << Rloss);
data[1] = (char)(((color & Gmask) >> Gshift) << Gloss);
data[2] = (char)(((color & Bmask) >> Bshift) << Bloss);
data += 3;
}
}
break;
case 3:
for (h = 0; h < surf->h; ++h) {
Uint8 *ptr = (Uint8 *)DATAROW(surf->pixels, h, surf->pitch,
surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
color = ptr[0] + (ptr[1] << 8) + (ptr[2] << 16);
#else
color = ptr[2] + (ptr[1] << 8) + (ptr[0] << 16);
#endif
ptr += 3;
data[0] = (char)(((color & Rmask) >> Rshift) << Rloss);
data[1] = (char)(((color & Gmask) >> Gshift) << Gloss);
data[2] = (char)(((color & Bmask) >> Bshift) << Bloss);
data += 3;
}
}
break;
case 4:
for (h = 0; h < surf->h; ++h) {
Uint32 *ptr = (Uint32 *)DATAROW(
surf->pixels, h, surf->pitch, surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
color = *ptr++;
data[0] = (char)(((color & Rmask) >> Rshift) << Rloss);
data[1] = (char)(((color & Gmask) >> Gshift) << Rloss);
data[2] = (char)(((color & Bmask) >> Bshift) << Rloss);
data += 3;
}
}
break;
}
#if IS_SDLv1
if (!temp)
pgSurface_Unlock(surfobj);
#else /* IS_SDLv2 */
pgSurface_Unlock(surfobj);
#endif /* IS_SDLv2 */
}
else if (!strcmp(format, "RGBX") || !strcmp(format, "RGBA")) {
if (strcmp(format, "RGBA"))
hascolorkey = 0;
string =
Bytes_FromStringAndSize(NULL, (Py_ssize_t)surf->w * surf->h * 4);
if (!string)
return NULL;
Bytes_AsStringAndSize(string, &data, &len);
pgSurface_Lock(surfobj);
pixels = (char *)surf->pixels;
switch (surf->format->BytesPerPixel) {
case 1:
for (h = 0; h < surf->h; ++h) {
Uint8 *ptr = (Uint8 *)DATAROW(surf->pixels, h, surf->pitch,
surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
color = *ptr++;
data[0] = (char)surf->format->palette->colors[color].r;
data[1] = (char)surf->format->palette->colors[color].g;
data[2] = (char)surf->format->palette->colors[color].b;
data[3] = hascolorkey ? (char)(color != colorkey) * 255
: (char)255;
data += 4;
}
}
break;
case 2:
for (h = 0; h < surf->h; ++h) {
Uint16 *ptr = (Uint16 *)DATAROW(
surf->pixels, h, surf->pitch, surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
color = *ptr++;
data[0] = (char)(((color & Rmask) >> Rshift) << Rloss);
data[1] = (char)(((color & Gmask) >> Gshift) << Gloss);
data[2] = (char)(((color & Bmask) >> Bshift) << Bloss);
data[3] =
hascolorkey
? (char)(color != colorkey) * 255
: (char)(Amask ? (((color & Amask) >> Ashift)
<< Aloss)
: 255);
data += 4;
}
}
break;
case 3:
for (h = 0; h < surf->h; ++h) {
Uint8 *ptr = (Uint8 *)DATAROW(surf->pixels, h, surf->pitch,
surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
color = ptr[0] + (ptr[1] << 8) + (ptr[2] << 16);
#else
color = ptr[2] + (ptr[1] << 8) + (ptr[0] << 16);
#endif
ptr += 3;
data[0] = (char)(((color & Rmask) >> Rshift) << Rloss);
data[1] = (char)(((color & Gmask) >> Gshift) << Gloss);
data[2] = (char)(((color & Bmask) >> Bshift) << Bloss);
data[3] =
hascolorkey
? (char)(color != colorkey) * 255
: (char)(Amask ? (((color & Amask) >> Ashift)
<< Aloss)
: 255);
data += 4;
}
}
break;
case 4:
tostring_surf_32bpp(surf, flipped, hascolorkey, colorkey,
data, 0, 3);
break;
}
pgSurface_Unlock(surfobj);
}
else if (!strcmp(format, "ARGB")) {
hascolorkey = 0;
string =
Bytes_FromStringAndSize(NULL, (Py_ssize_t)surf->w * surf->h * 4);
if (!string)
return NULL;
Bytes_AsStringAndSize(string, &data, &len);
pgSurface_Lock(surfobj);
pixels = (char *)surf->pixels;
switch (surf->format->BytesPerPixel) {
case 1:
for (h = 0; h < surf->h; ++h) {
Uint8 *ptr = (Uint8 *)DATAROW(surf->pixels, h, surf->pitch,
surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
color = *ptr++;
data[1] = (char)surf->format->palette->colors[color].r;
data[2] = (char)surf->format->palette->colors[color].g;
data[3] = (char)surf->format->palette->colors[color].b;
data[0] = (char)255;
data += 4;
}
}
break;
case 2:
for (h = 0; h < surf->h; ++h) {
Uint16 *ptr = (Uint16 *)DATAROW(
surf->pixels, h, surf->pitch, surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
color = *ptr++;
data[1] = (char)(((color & Rmask) >> Rshift) << Rloss);
data[2] = (char)(((color & Gmask) >> Gshift) << Gloss);
data[3] = (char)(((color & Bmask) >> Bshift) << Bloss);
data[0] = (char)(Amask ? (((color & Amask) >> Ashift)
<< Aloss)
: 255);
data += 4;
}
}
break;
case 3:
for (h = 0; h < surf->h; ++h) {
Uint8 *ptr = (Uint8 *)DATAROW(surf->pixels, h, surf->pitch,
surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
color = ptr[0] + (ptr[1] << 8) + (ptr[2] << 16);
#else
color = ptr[2] + (ptr[1] << 8) + (ptr[0] << 16);
#endif
ptr += 3;
data[1] = (char)(((color & Rmask) >> Rshift) << Rloss);
data[2] = (char)(((color & Gmask) >> Gshift) << Gloss);
data[3] = (char)(((color & Bmask) >> Bshift) << Bloss);
data[0] = (char)(Amask ? (((color & Amask) >> Ashift)
<< Aloss)
: 255);
data += 4;
}
}
break;
case 4:
tostring_surf_32bpp(surf, flipped, hascolorkey, colorkey,
data, 1, 0);
break;
}
pgSurface_Unlock(surfobj);
}
else if (!strcmp(format, "RGBA_PREMULT")) {
if (surf->format->BytesPerPixel == 1 || surf->format->Amask == 0)
return RAISE(PyExc_ValueError,
"Can only create pre-multiplied alpha strings if the "
"surface has per-pixel alpha");
hascolorkey = 0;
string =
Bytes_FromStringAndSize(NULL, (Py_ssize_t)surf->w * surf->h * 4);
if (!string)
return NULL;
Bytes_AsStringAndSize(string, &data, &len);
pgSurface_Lock(surfobj);
pixels = (char *)surf->pixels;
switch (surf->format->BytesPerPixel) {
case 2:
for (h = 0; h < surf->h; ++h) {
Uint16 *ptr = (Uint16 *)DATAROW(
surf->pixels, h, surf->pitch, surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
color = *ptr++;
alpha = ((color & Amask) >> Ashift) << Aloss;
data[0] =
(char)((((color & Rmask) >> Rshift) << Rloss) *
alpha / 255);
data[1] =
(char)((((color & Gmask) >> Gshift) << Gloss) *
alpha / 255);
data[2] =
(char)((((color & Bmask) >> Bshift) << Bloss) *
alpha / 255);
data[3] = (char)alpha;
data += 4;
}
}
break;
case 3:
for (h = 0; h < surf->h; ++h) {
Uint8 *ptr = (Uint8 *)DATAROW(surf->pixels, h, surf->pitch,
surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
#if SDL_BYTEORDER == SDL_LIL_ENDIAN
color = ptr[0] + (ptr[1] << 8) + (ptr[2] << 16);
#else
color = ptr[2] + (ptr[1] << 8) + (ptr[0] << 16);
#endif
ptr += 3;
alpha = ((color & Amask) >> Ashift) << Aloss;
data[0] =
(char)((((color & Rmask) >> Rshift) << Rloss) *
alpha / 255);
data[1] =
(char)((((color & Gmask) >> Gshift) << Gloss) *
alpha / 255);
data[2] =
(char)((((color & Bmask) >> Bshift) << Bloss) *
alpha / 255);
data[3] = (char)alpha;
data += 4;
}
}
break;
case 4:
for (h = 0; h < surf->h; ++h) {
Uint32 *ptr = (Uint32 *)DATAROW(
surf->pixels, h, surf->pitch, surf->h, flipped);
for (w = 0; w < surf->w; ++w) {
color = *ptr++;
alpha = ((color & Amask) >> Ashift) << Aloss;
if (alpha == 0) {
data[0] = data[1] = data[2] = 0;
}
else {
data[0] =
(char)((((color & Rmask) >> Rshift) << Rloss) *
alpha / 255);
data[1] =
(char)((((color & Gmask) >> Gshift) << Gloss) *
alpha / 255);
data[2] =
(char)((((color & Bmask) >> Bshift) << Bloss) *
alpha / 255);
}
data[3] = (char)alpha;
data += 4;
}
}
break;