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user32: Move PNG support to a new Unix library. 

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Alexandre Julliard 2020-09-21 13:42:34 +02:00
parent a014f413d6
commit 148d3aa461
4 changed files with 356 additions and 303 deletions
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1
dlls/user32/Makefile.in
View File

@ -35,6 +35,7 @@ C_SRCS = \
msgbox.c \
nonclient.c \
painting.c \
png.c \
property.c \
rawinput.c \
resource.c \

310
dlls/user32/cursoricon.c
View File

@ -31,9 +31,6 @@
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#ifdef SONAME_LIBPNG
#include <png.h>
#endif
#include "windef.h"
#include "winbase.h"
@ -118,315 +115,21 @@ static int get_display_bpp(void)
return ret;
}
#ifdef SONAME_LIBPNG
static void *libpng_handle;
#define MAKE_FUNCPTR(f) static typeof(f) * p##f
MAKE_FUNCPTR(png_create_read_struct);
MAKE_FUNCPTR(png_create_info_struct);
MAKE_FUNCPTR(png_destroy_read_struct);
MAKE_FUNCPTR(png_error);
MAKE_FUNCPTR(png_get_bit_depth);
MAKE_FUNCPTR(png_get_color_type);
MAKE_FUNCPTR(png_get_error_ptr);
MAKE_FUNCPTR(png_get_image_height);
MAKE_FUNCPTR(png_get_image_width);
MAKE_FUNCPTR(png_get_io_ptr);
MAKE_FUNCPTR(png_read_image);
MAKE_FUNCPTR(png_read_info);
MAKE_FUNCPTR(png_read_update_info);
MAKE_FUNCPTR(png_set_bgr);
MAKE_FUNCPTR(png_set_crc_action);
MAKE_FUNCPTR(png_set_error_fn);
MAKE_FUNCPTR(png_set_expand);
MAKE_FUNCPTR(png_set_gray_to_rgb);
MAKE_FUNCPTR(png_set_read_fn);
#undef MAKE_FUNCPTR
static INIT_ONCE init_once = INIT_ONCE_STATIC_INIT;
static const struct png_funcs *png_funcs;
static BOOL WINAPI load_libpng( INIT_ONCE *once, void *param, void **context )
{
if (!(libpng_handle = dlopen( SONAME_LIBPNG, RTLD_NOW )))
{
WARN( "failed to load %s\n", SONAME_LIBPNG );
return TRUE;
}
#define LOAD_FUNCPTR(f) \
if ((p##f = dlsym(libpng_handle, #f)) == NULL) \
{ \
WARN( "%s not found in %s\n", #f, SONAME_LIBPNG ); \
libpng_handle = NULL; \
return TRUE; \
}
LOAD_FUNCPTR(png_create_read_struct);
LOAD_FUNCPTR(png_create_info_struct);
LOAD_FUNCPTR(png_destroy_read_struct);
LOAD_FUNCPTR(png_error);
LOAD_FUNCPTR(png_get_bit_depth);
LOAD_FUNCPTR(png_get_color_type);
LOAD_FUNCPTR(png_get_error_ptr);
LOAD_FUNCPTR(png_get_image_height);
LOAD_FUNCPTR(png_get_image_width);
LOAD_FUNCPTR(png_get_io_ptr);
LOAD_FUNCPTR(png_read_image);
LOAD_FUNCPTR(png_read_info);
LOAD_FUNCPTR(png_read_update_info);
LOAD_FUNCPTR(png_set_bgr);
LOAD_FUNCPTR(png_set_crc_action);
LOAD_FUNCPTR(png_set_error_fn);
LOAD_FUNCPTR(png_set_expand);
LOAD_FUNCPTR(png_set_gray_to_rgb);
LOAD_FUNCPTR(png_set_read_fn);
#undef LOAD_FUNCPTR
__wine_init_unix_lib( user32_module, DLL_PROCESS_ATTACH, NULL, &png_funcs );
return TRUE;
}
static void user_error_fn(png_structp png_ptr, png_const_charp error_message)
{
jmp_buf *pjmpbuf;
/* This uses setjmp/longjmp just like the default. We can't use the
* default because there's no way to access the jmp buffer in the png_struct
* that works in 1.2 and 1.4 and allows us to dynamically load libpng. */
WARN("PNG error: %s\n", debugstr_a(error_message));
pjmpbuf = ppng_get_error_ptr(png_ptr);
longjmp(*pjmpbuf, 1);
}
static void user_warning_fn(png_structp png_ptr, png_const_charp warning_message)
{
WARN("PNG warning: %s\n", debugstr_a(warning_message));
}
struct png_wrapper
{
const char *buffer;
size_t size, pos;
};
static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
struct png_wrapper *png = ppng_get_io_ptr(png_ptr);
if (png->size - png->pos >= length)
{
memcpy(data, png->buffer + png->pos, length);
png->pos += length;
}
else
{
ppng_error(png_ptr, "failed to read PNG data");
}
}
static unsigned be_uint(unsigned val)
{
union
{
unsigned val;
unsigned char c[4];
} u;
u.val = val;
return (u.c[0] << 24) | (u.c[1] << 16) | (u.c[2] << 8) | u.c[3];
}
static BOOL have_libpng(void)
{
return InitOnceExecuteOnce( &init_once, load_libpng, NULL, NULL ) && libpng_handle;
return InitOnceExecuteOnce( &init_once, load_libpng, NULL, NULL ) && png_funcs;
}
static BOOL get_png_info(const void *png_data, DWORD size, int *width, int *height, int *bpp)
{
static const char png_sig[8] = { 0x89,'P','N','G',0x0d,0x0a,0x1a,0x0a };
static const char png_IHDR[8] = { 0,0,0,0x0d,'I','H','D','R' };
const struct
{
char png_sig[8];
char ihdr_sig[8];
unsigned width, height;
char bit_depth, color_type, compression, filter, interlace;
} *png = png_data;
if (size < sizeof(*png)) return FALSE;
if (memcmp(png->png_sig, png_sig, sizeof(png_sig)) != 0) return FALSE;
if (memcmp(png->ihdr_sig, png_IHDR, sizeof(png_IHDR)) != 0) return FALSE;
*bpp = (png->color_type == PNG_COLOR_TYPE_RGB_ALPHA) ? 32 : 24;
*width = be_uint(png->width);
*height = be_uint(png->height);
return TRUE;
}
static BITMAPINFO *load_png(const char *png_data, DWORD *size)
{
struct png_wrapper png;
png_structp png_ptr;
png_infop info_ptr;
png_bytep *row_pointers = NULL;
jmp_buf jmpbuf;
int color_type, bit_depth, bpp, width, height;
int rowbytes, image_size, mask_size = 0, i;
BITMAPINFO *info = NULL;
unsigned char *image_data;
if (!get_png_info(png_data, *size, &width, &height, &bpp))
return NULL;
if (!have_libpng()) return NULL;
png.buffer = png_data;
png.size = *size;
png.pos = 0;
/* initialize libpng */
png_ptr = ppng_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) return NULL;
info_ptr = ppng_create_info_struct(png_ptr);
if (!info_ptr)
{
ppng_destroy_read_struct(&png_ptr, NULL, NULL);
return NULL;
}
/* set up setjmp/longjmp error handling */
if (setjmp(jmpbuf))
{
HeapFree(GetProcessHeap(), 0, row_pointers);
HeapFree(GetProcessHeap(), 0, info);
ppng_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
ppng_set_error_fn(png_ptr, jmpbuf, user_error_fn, user_warning_fn);
ppng_set_crc_action(png_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);
/* set up custom i/o handling */
ppng_set_read_fn(png_ptr, &png, user_read_data);
/* read the header */
ppng_read_info(png_ptr, info_ptr);
color_type = ppng_get_color_type(png_ptr, info_ptr);
bit_depth = ppng_get_bit_depth(png_ptr, info_ptr);
/* expand grayscale image data to rgb */
if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
ppng_set_gray_to_rgb(png_ptr);
/* expand palette image data to rgb */
if (color_type == PNG_COLOR_TYPE_PALETTE || bit_depth < 8)
ppng_set_expand(png_ptr);
/* update color type information */
ppng_read_update_info(png_ptr, info_ptr);
color_type = ppng_get_color_type(png_ptr, info_ptr);
bit_depth = ppng_get_bit_depth(png_ptr, info_ptr);
bpp = 0;
switch (color_type)
{
case PNG_COLOR_TYPE_RGB:
if (bit_depth == 8)
bpp = 24;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
if (bit_depth == 8)
{
ppng_set_bgr(png_ptr);
bpp = 32;
}
break;
default:
break;
}
if (!bpp)
{
FIXME("unsupported PNG color format %d, %d bpp\n", color_type, bit_depth);
ppng_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
width = ppng_get_image_width(png_ptr, info_ptr);
height = ppng_get_image_height(png_ptr, info_ptr);
rowbytes = (width * bpp + 7) / 8;
image_size = height * rowbytes;
if (bpp != 32) /* add a mask if there is no alpha */
mask_size = (width + 7) / 8 * height;
info = HeapAlloc(GetProcessHeap(), 0, sizeof(BITMAPINFOHEADER) + image_size + mask_size);
if (!info)
{
ppng_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
image_data = (unsigned char *)info + sizeof(BITMAPINFOHEADER);
memset(image_data + image_size, 0, mask_size);
row_pointers = HeapAlloc(GetProcessHeap(), 0, height * sizeof(png_bytep));
if (!row_pointers)
{
HeapFree(GetProcessHeap(), 0, info);
ppng_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
/* upside down */
for (i = 0; i < height; i++)
row_pointers[i] = image_data + (height - i - 1) * rowbytes;
ppng_read_image(png_ptr, row_pointers);
HeapFree(GetProcessHeap(), 0, row_pointers);
ppng_destroy_read_struct(&png_ptr, &info_ptr, NULL);
info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
info->bmiHeader.biWidth = width;
info->bmiHeader.biHeight = height * 2;
info->bmiHeader.biPlanes = 1;
info->bmiHeader.biBitCount = bpp;
info->bmiHeader.biCompression = BI_RGB;
info->bmiHeader.biSizeImage = image_size;
info->bmiHeader.biXPelsPerMeter = 0;
info->bmiHeader.biYPelsPerMeter = 0;
info->bmiHeader.biClrUsed = 0;
info->bmiHeader.biClrImportant = 0;
*size = sizeof(BITMAPINFOHEADER) + image_size + mask_size;
return info;
}
#else /* SONAME_LIBPNG */
static BOOL have_libpng(void)
{
static int warned;
if (!warned++) WARN( "PNG support not compiled in\n" );
return FALSE;
}
static BOOL get_png_info(const void *png_data, DWORD size, int *width, int *height, int *bpp)
{
return FALSE;
}
static BITMAPINFO *load_png( const char *png, DWORD *max_size )
{
return NULL;
}
#endif
static HICON alloc_icon_handle( BOOL is_ani, UINT num_steps )
{
struct cursoricon_object *obj;
@ -1005,7 +708,7 @@ static BOOL CURSORICON_GetFileEntry( LPCVOID dir, DWORD size, int n,
if (info->biSize == PNG_SIGN)
{
if (have_libpng()) return get_png_info(info, size, width, height, bits);
if (have_libpng()) return png_funcs->get_png_info(info, size, width, height, bits);
*width = *height = *bits = 0;
return TRUE;
}
@ -1159,7 +862,8 @@ static HICON create_icon_from_bmi( const BITMAPINFO *bmi, DWORD maxsize, HMODULE
{
BITMAPINFO *bmi_png;
bmi_png = load_png( (const char *)bmi, &maxsize );
if (!have_libpng()) return 0;
bmi_png = png_funcs->load_png( (const char *)bmi, &maxsize );
if (bmi_png)
{
hObj = create_icon_from_bmi( bmi_png, maxsize, module, resname,

342
dlls/user32/png.c Normal file
View File

@ -0,0 +1,342 @@
/*
* PNG icon support
*
* Copyright 2018 Dmitry Timoshkov
* Copyright 2019 Alexandre Julliard
*
* 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 2.1 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#if 0
#pragma makedep unix
#endif
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#ifdef SONAME_LIBPNG
#include <png.h>
#endif
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winerror.h"
#include "winnls.h"
#include "winternl.h"
#include "wine/exception.h"
#include "wine/server.h"
#include "controls.h"
#include "win.h"
#include "user_private.h"
#include "wine/list.h"
#include "wine/unicode.h"
#include "wine/debug.h"
#ifdef SONAME_LIBPNG
WINE_DEFAULT_DEBUG_CHANNEL(cursor);
static void *libpng_handle;
#define MAKE_FUNCPTR(f) static typeof(f) * p##f
MAKE_FUNCPTR(png_create_read_struct);
MAKE_FUNCPTR(png_create_info_struct);
MAKE_FUNCPTR(png_destroy_read_struct);
MAKE_FUNCPTR(png_error);
MAKE_FUNCPTR(png_get_bit_depth);
MAKE_FUNCPTR(png_get_color_type);
MAKE_FUNCPTR(png_get_error_ptr);
MAKE_FUNCPTR(png_get_image_height);
MAKE_FUNCPTR(png_get_image_width);
MAKE_FUNCPTR(png_get_io_ptr);
MAKE_FUNCPTR(png_read_image);
MAKE_FUNCPTR(png_read_info);
MAKE_FUNCPTR(png_read_update_info);
MAKE_FUNCPTR(png_set_bgr);
MAKE_FUNCPTR(png_set_crc_action);
MAKE_FUNCPTR(png_set_error_fn);
MAKE_FUNCPTR(png_set_expand);
MAKE_FUNCPTR(png_set_gray_to_rgb);
MAKE_FUNCPTR(png_set_read_fn);
#undef MAKE_FUNCPTR
static void user_error_fn(png_structp png_ptr, png_const_charp error_message)
{
jmp_buf *pjmpbuf;
/* This uses setjmp/longjmp just like the default. We can't use the
* default because there's no way to access the jmp buffer in the png_struct
* that works in 1.2 and 1.4 and allows us to dynamically load libpng. */
WARN("PNG error: %s\n", debugstr_a(error_message));
pjmpbuf = ppng_get_error_ptr(png_ptr);
longjmp(*pjmpbuf, 1);
}
static void user_warning_fn(png_structp png_ptr, png_const_charp warning_message)
{
WARN("PNG warning: %s\n", debugstr_a(warning_message));
}
struct png_wrapper
{
const char *buffer;
size_t size, pos;
};
static void user_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
struct png_wrapper *png = ppng_get_io_ptr(png_ptr);
if (png->size - png->pos >= length)
{
memcpy(data, png->buffer + png->pos, length);
png->pos += length;
}
else
{
ppng_error(png_ptr, "failed to read PNG data");
}
}
static unsigned be_uint(unsigned val)
{
union
{
unsigned val;
unsigned char c[4];
} u;
u.val = val;
return (u.c[0] << 24) | (u.c[1] << 16) | (u.c[2] << 8) | u.c[3];
}
static BOOL CDECL get_png_info(const void *png_data, DWORD size, int *width, int *height, int *bpp)
{
static const char png_sig[8] = { 0x89,'P','N','G',0x0d,0x0a,0x1a,0x0a };
static const char png_IHDR[8] = { 0,0,0,0x0d,'I','H','D','R' };
const struct
{
char png_sig[8];
char ihdr_sig[8];
unsigned width, height;
char bit_depth, color_type, compression, filter, interlace;
} *png = png_data;
if (size < sizeof(*png)) return FALSE;
if (memcmp(png->png_sig, png_sig, sizeof(png_sig)) != 0) return FALSE;
if (memcmp(png->ihdr_sig, png_IHDR, sizeof(png_IHDR)) != 0) return FALSE;
*bpp = (png->color_type == PNG_COLOR_TYPE_RGB_ALPHA) ? 32 : 24;
*width = be_uint(png->width);
*height = be_uint(png->height);
return TRUE;
}
static BITMAPINFO * CDECL load_png(const char *png_data, DWORD *size)
{
struct png_wrapper png;
png_structp png_ptr;
png_infop info_ptr;
png_bytep *row_pointers = NULL;
jmp_buf jmpbuf;
int color_type, bit_depth, bpp, width, height;
int rowbytes, image_size, mask_size = 0, i;
BITMAPINFO *info = NULL;
unsigned char *image_data;
if (!get_png_info(png_data, *size, &width, &height, &bpp)) return NULL;
png.buffer = png_data;
png.size = *size;
png.pos = 0;
/* initialize libpng */
png_ptr = ppng_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) return NULL;
info_ptr = ppng_create_info_struct(png_ptr);
if (!info_ptr)
{
ppng_destroy_read_struct(&png_ptr, NULL, NULL);
return NULL;
}
/* set up setjmp/longjmp error handling */
if (setjmp(jmpbuf))
{
free(row_pointers);
RtlFreeHeap(GetProcessHeap(), 0, info);
ppng_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
ppng_set_error_fn(png_ptr, jmpbuf, user_error_fn, user_warning_fn);
ppng_set_crc_action(png_ptr, PNG_CRC_QUIET_USE, PNG_CRC_QUIET_USE);
/* set up custom i/o handling */
ppng_set_read_fn(png_ptr, &png, user_read_data);
/* read the header */
ppng_read_info(png_ptr, info_ptr);
color_type = ppng_get_color_type(png_ptr, info_ptr);
bit_depth = ppng_get_bit_depth(png_ptr, info_ptr);
/* expand grayscale image data to rgb */
if (color_type == PNG_COLOR_TYPE_GRAY || color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
ppng_set_gray_to_rgb(png_ptr);
/* expand palette image data to rgb */
if (color_type == PNG_COLOR_TYPE_PALETTE || bit_depth < 8)
ppng_set_expand(png_ptr);
/* update color type information */
ppng_read_update_info(png_ptr, info_ptr);
color_type = ppng_get_color_type(png_ptr, info_ptr);
bit_depth = ppng_get_bit_depth(png_ptr, info_ptr);
bpp = 0;
switch (color_type)
{
case PNG_COLOR_TYPE_RGB:
if (bit_depth == 8)
bpp = 24;
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
if (bit_depth == 8)
{
ppng_set_bgr(png_ptr);
bpp = 32;
}
break;
default:
break;
}
if (!bpp)
{
FIXME("unsupported PNG color format %d, %d bpp\n", color_type, bit_depth);
ppng_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
width = ppng_get_image_width(png_ptr, info_ptr);
height = ppng_get_image_height(png_ptr, info_ptr);
rowbytes = (width * bpp + 7) / 8;
image_size = height * rowbytes;
if (bpp != 32) /* add a mask if there is no alpha */
mask_size = (width + 7) / 8 * height;
info = RtlAllocateHeap(GetProcessHeap(), 0, sizeof(BITMAPINFOHEADER) + image_size + mask_size);
if (!info)
{
ppng_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
image_data = (unsigned char *)info + sizeof(BITMAPINFOHEADER);
memset(image_data + image_size, 0, mask_size);
row_pointers = malloc(height * sizeof(png_bytep));
if (!row_pointers)
{
RtlFreeHeap(GetProcessHeap(), 0, info);
ppng_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return NULL;
}
/* upside down */
for (i = 0; i < height; i++)
row_pointers[i] = image_data + (height - i - 1) * rowbytes;
ppng_read_image(png_ptr, row_pointers);
free(row_pointers);
ppng_destroy_read_struct(&png_ptr, &info_ptr, NULL);
info->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
info->bmiHeader.biWidth = width;
info->bmiHeader.biHeight = height * 2;
info->bmiHeader.biPlanes = 1;
info->bmiHeader.biBitCount = bpp;
info->bmiHeader.biCompression = BI_RGB;
info->bmiHeader.biSizeImage = image_size;
info->bmiHeader.biXPelsPerMeter = 0;
info->bmiHeader.biYPelsPerMeter = 0;
info->bmiHeader.biClrUsed = 0;
info->bmiHeader.biClrImportant = 0;
*size = sizeof(BITMAPINFOHEADER) + image_size + mask_size;
return info;
}
static const struct png_funcs png_funcs =
{
get_png_info,
load_png
};
NTSTATUS CDECL __wine_init_unix_lib( HMODULE module, DWORD reason, const void *ptr_in, void *ptr_out )
{
if (reason != DLL_PROCESS_ATTACH) return STATUS_SUCCESS;
if (!(libpng_handle = dlopen( SONAME_LIBPNG, RTLD_NOW )))
{
WARN( "failed to load %s\n", SONAME_LIBPNG );
return STATUS_DLL_NOT_FOUND;
}
#define LOAD_FUNCPTR(f) \
if (!(p##f = dlsym( libpng_handle, #f ))) \
{ \
WARN( "%s not found in %s\n", #f, SONAME_LIBPNG ); \
return STATUS_PROCEDURE_NOT_FOUND; \
}
LOAD_FUNCPTR(png_create_read_struct);
LOAD_FUNCPTR(png_create_info_struct);
LOAD_FUNCPTR(png_destroy_read_struct);
LOAD_FUNCPTR(png_error);
LOAD_FUNCPTR(png_get_bit_depth);
LOAD_FUNCPTR(png_get_color_type);
LOAD_FUNCPTR(png_get_error_ptr);
LOAD_FUNCPTR(png_get_image_height);
LOAD_FUNCPTR(png_get_image_width);
LOAD_FUNCPTR(png_get_io_ptr);
LOAD_FUNCPTR(png_read_image);
LOAD_FUNCPTR(png_read_info);
LOAD_FUNCPTR(png_read_update_info);
LOAD_FUNCPTR(png_set_bgr);
LOAD_FUNCPTR(png_set_crc_action);
LOAD_FUNCPTR(png_set_error_fn);
LOAD_FUNCPTR(png_set_expand);
LOAD_FUNCPTR(png_set_gray_to_rgb);
LOAD_FUNCPTR(png_set_read_fn);
#undef LOAD_FUNCPTR
*(const struct png_funcs **)ptr_out = &png_funcs;
return STATUS_SUCCESS;
}
#endif /* SONAME_LIBPNG */

6
dlls/user32/user_private.h
View File

@ -370,6 +370,12 @@ typedef struct
extern int bitmap_info_size( const BITMAPINFO * info, WORD coloruse ) DECLSPEC_HIDDEN;
extern BOOL get_icon_size( HICON handle, SIZE *size ) DECLSPEC_HIDDEN;
struct png_funcs
{
BOOL (CDECL *get_png_info)(const void *png_data, DWORD size, int *width, int *height, int *bpp);
BITMAPINFO * (CDECL *load_png)(const char *png_data, DWORD *size);
};
/* Mingw's assert() imports MessageBoxA and gets confused by user32 exporting it */
#ifdef __MINGW32__
#undef assert