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Loading framework done, start of PNG loader
This commit is contained in:
Arturo Espinosa
parent
f0723b00a9
commit
f876ca2681
@ -5,22 +5,124 @@
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* Miguel de Icaza (miguel@gnu.org)
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*/
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#include <config.h>
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#include <stdio.h>
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#include "gdk-pixbuf.h"
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static gboolean
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pixbuf_check_png (unsigned char *buffer, int size)
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{
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if (size < 28)
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return FALSE;
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if (buffer [0] != 0x89 ||
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buffer [1] != 'P' ||
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buffer [2] != 'N' ||
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buffer [3] != 'G' ||
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buffer [4] != 0x0d ||
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buffer [5] != 0x0a ||
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buffer [6] != 0x1a ||
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buffer [7] != 0x0a)
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return FALSE;
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return TRUE;
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}
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static gboolean
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pixbuf_check_jpeg (unsigned char *buffer, int size)
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{
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if (size < 10)
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return FALSE;
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if (buffer [0] != 0xff || buffer [1] != 0xd8)
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return FALSE;
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return TRUE;
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}
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static gboolean
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pixbuf_check_tiff (unsigned char *buffer, int size)
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{
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if (size < 10)
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return FALSE;
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if (buffer [0] == 'M' && buffer [1] == 'M' && buffer [2] == 0 && buffer [3] == 0x2a)
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return TRUE;
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if (buffer [0] == 'I' && buffer [1] == 'I' && buffer [2] == 0x2a && buffer [3] == 0)
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return TRUE;
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return FALSE;
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}
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static gboolean
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pixbuf_check_gif (unsigned char *buffer, int size)
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{
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if (size < 20)
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return FALSE;
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if (strncmp (buffer, "GIF8", 4) == 0)
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return TRUE;
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return FALSE;
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}
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static gboolean
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pixbuf_check_xpm (unsigned char *buffer, int size)
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{
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if (size < 20)
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return FALSE;
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if (strncmp (buffer, "/* XPM */", 9) == 0)
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return TRUE;
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return FALSE;
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}
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static gboolean
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pixbuf_check_bmp (unsigned char *buffer, int size)
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{
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if (size < 20)
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return FALSE;
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if (buffer [0] != 'B' || buffer [1] != 'M')
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return FALSE;
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return TRUE;
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}
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static gboolean
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pixbuf_check_ppm (unsigned char *buffer, int size)
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{
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if (size < 20)
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return FALSE;
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if (buffer [0] == 'P'){
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if (buffer [1] == '1' ||
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buffer [1] == '2' ||
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buffer [1] == '3' ||
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buffer [1] == '4' ||
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buffer [1] == '5' ||
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buffer [1] == '6')
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return TRUE;
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}
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return FALSE;
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}
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static struct {
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char *module_name;
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gboolean (*format_check)(char *buffer, int size);
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GdkPixBuf *(*load)(char *filename);
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gboolean (*format_check)(unsigned char *buffer, int size);
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GModule *module;
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GdkPixBuf *(*load)(FILE *f)
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int (*save)(char *filename, ...);
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} loaders [] = {
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{ "png", pixbuf_check_png, NULL, NULL },
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{ "jpeg", pixbuf_check_jpeg, NULL, NULL },
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{ "tiff", pixbuf_check_tiff, NULL, NULL },
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{ "gif", pixbuf_check_gif, NULL, NULL },
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{ "xpm", pixbuf_check_xpm, pixbuf_xpm_load, pixbuf_xpm_save },
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{ "bmp", pixbuf_check_bmp, NULL, NULL },
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{ "ppm", pixbuf_check_ppm, NULL, NULL },
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{ NULL, NULL, NULL, NULL },
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} file_formats [] = {
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{ "png", pixbuf_check_png, NULL, NULL, NULL },
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{ "jpeg", pixbuf_check_jpeg, NULL, NULL, NULL },
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{ "tiff", pixbuf_check_tiff, NULL, NULL, NULL },
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{ "gif", pixbuf_check_gif, NULL, NULL, NULL },
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{ "xpm", pixbuf_check_xpm, NULL, NULL, NULL }
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{ "bmp", pixbuf_check_bmp, NULL, NULL, NULL },
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{ "ppm", pixbuf_check_ppm, NULL, NULL, NULL },
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{ NULL, NULL, NULL, NULL, NULL },
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};
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static int
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@ -33,8 +135,27 @@ image_file_format (const char *file)
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}
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static void
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image_loader_load (int idx)
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image_handler_load (int idx)
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{
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char *module_name = g_strconcat ("pixbuf-", file_formats [idx].module_name, NULL);
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char *path;
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GModule *module;
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void *load_sym, *save_sym;
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path = g_module_build_path (PIXBUF_LIBDIR, module_name);
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g_free (module_name);
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module = g_module_open (path, G_MODULE_BIND_LAZY);
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if (!module)
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return;
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file_formats [idx].module = module;
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if (g_module_symbol (module, "image_load", &load_sym))
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file_formats [idx].load = load_sym;
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if (g_module_symbol (module, "image_save", &save_sym))
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file_formats [idx].save = save_sym;
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}
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GdkPixBuf *
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@ -49,21 +170,30 @@ gdk_pixbuf_load_image (const char *file)
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if (!f)
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return NULL;
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n = fread (&buffer, 1, sizeof (buffer), f);
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fclose (f);
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if (n == 0)
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if (n == 0){
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fclose (f);
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return NULL;
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}
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for (i = 0; loaders [i].module_name; i++){
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if ((*loaders [i].format_check)(buffer, n)){
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if (!loaders [i].load)
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image_loader_load (i);
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for (i = 0; file_formats [i].module_name; i++){
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if ((*file_formats [i].format_check)(buffer, n)){
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if (!file_formats [i].load)
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image_handler_load (i);
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if (!loaders [i].load)
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if (!file_formats [i].load){
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fclose (f);
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return NULL;
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}
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return (*loaders [i].load)(file);
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rewind (f);
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pixbuf = (*file_formats [i].load)(f);
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fclose (f);
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return pixbuf;
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}
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}
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fclose (f);
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return NULL;
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}
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62
gdk-pixbuf/io-png.c
Normal file
62
gdk-pixbuf/io-png.c
Normal file
@ -0,0 +1,62 @@
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/*
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* io-png.c: GdkPixBuf image loader for PNG files.
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*
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* Author:
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* Rasterman (raster@redhat.com).
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* Miguel de Icaza (miguel@gnu.org)
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*
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*/
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#include <config.h>
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#include <stdio.h>
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#include "gdk-pixbuf.h"
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#include "gdk-pixbuf-io.h"
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#include <png.h>
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/* Shared library entry point */
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GdkPixBuf *
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image_load (FILE *f);
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{
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png_structp png;
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png_infop info_ptr, end_info;
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int width, height, depth, color_type, interlace_type;
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g_return_val_if_fail (filename != NULL, NULL);
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png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (png)
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return NULL;
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info_ptr = png_create_info_struct (png);
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if (!info_ptr){
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png_destroy_read_struct (&png, NULL, NULL);
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return NULL;
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}
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end_info = png_create_info_struct (png);
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if (!end_info){
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png_destroy_read_struct (&png, &info_ptr, NULL);
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return NULL:
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}
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if (setjmp (png->jmpbuf)){
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png_destroy_read_struct (&png, &info_ptr, &end_info);
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return NULL;
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}
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png_init_io (pngptr, f);
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png_read_info (png, info_ptr);
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png_get_IHDR (png, info_ptr, &width, &height, &depth, &color_type, &interlace_type, NULL, NULL);
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if (color_type == color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_expand (png);
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png_set_strip_16 (png);
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png_set_packing (png);
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if (png_get_valid (png, info_ptr, PNG_INFO_tRNS))
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png_set_expand (png);
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png_set_filler (png, 0xff, PNG_FILLER_AFTER);
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/* FIXME finish this */
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}
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