1 files changed, 104 insertions, 0 deletions
diff --git a/readers.h b/readers.h
new file mode 100644
index 0000000..b54e5b6
--- /dev/null
+++ b/readers.h
@@ -0,0 +1,104 @@
+#include "list.h"
+
+enum ida_extype {
+    EXTRA_COMMENT = 1,
+    EXTRA_EXIF    = 2,
+};
+
+struct ida_extra {
+    enum ida_extype   type;
+    unsigned char     *data;
+    unsigned int      size;
+    struct ida_extra  *next;
+};
+
+/* image data and metadata */
+struct ida_image_info {
+    unsigned int      width;
+    unsigned int      height;
+    unsigned int      dpi;
+    unsigned int      npages;
+    struct ida_extra  *extra;
+
+    int               thumbnail;
+    unsigned int      real_width;
+    unsigned int      real_height;
+};
+
+struct ida_image {
+    struct ida_image_info  i;
+    unsigned char          *data;
+};
+struct ida_rect {
+    int x1,y1,x2,y2;
+};
+
+/* load image files */
+struct ida_loader {
+    char  *magic;
+    int   moff;
+    int   mlen;
+    char  *name;
+    void* (*init)(FILE *fp, char *filename, unsigned int page,
+		  struct ida_image_info *i, int thumbnail);
+    void  (*read)(unsigned char *dst, unsigned int line, void *data);
+    void  (*done)(void *data);
+    struct list_head list;
+};
+
+/* filter + operations */
+struct ida_op {
+    char  *name;
+    void* (*init)(struct ida_image *src, struct ida_rect *rect,
+		  struct ida_image_info *i, void *parm);
+    void  (*work)(struct ida_image *src, struct ida_rect *rect,
+		  unsigned char *dst, int line,
+		  void *data);
+    void  (*done)(void *data);
+};
+
+void* op_none_init(struct ida_image *src, struct ida_rect *rect,
+		   struct ida_image_info *i, void *parm);
+void  op_none_done(void *data);
+void  op_free_done(void *data);
+
+/* ----------------------------------------------------------------------- */
+/* resolution                                                              */
+
+#define res_cm_to_inch(x) ((x * 2540 + 5) / 1000)
+#define res_m_to_inch(x)  ((x * 2540 + 5) / 100000)
+#define res_inch_to_m(x)  ((x * 100000 + 5) / 2540)
+
+/* ----------------------------------------------------------------------- */
+
+/* helpers */
+void load_bits_lsb(unsigned char *dst, unsigned char *src, int width,
+		   int on, int off);
+void load_bits_msb(unsigned char *dst, unsigned char *src, int width,
+		   int on, int off);
+void load_gray(unsigned char *dst, unsigned char *src, int width);
+void load_graya(unsigned char *dst, unsigned char *src, int width);
+void load_rgba(unsigned char *dst, unsigned char *src, int width);
+
+int load_add_extra(struct ida_image_info *info, enum ida_extype type,
+		   unsigned char *data, unsigned int size);
+struct ida_extra* load_find_extra(struct ida_image_info *info,
+				  enum ida_extype type);
+int load_free_extras(struct ida_image_info *info);
+
+/* ----------------------------------------------------------------------- */
+
+/* other */
+extern int debug;
+extern struct ida_loader ppm_loader;
+extern struct ida_loader jpeg_loader;
+extern struct ida_loader sane_loader;
+extern struct ida_writer ps_writer;
+extern struct ida_writer jpeg_writer;
+
+/* lists */
+#define __init __attribute__ ((constructor))
+#define __fini __attribute__ ((destructor))
+
+extern struct list_head loaders;
+void load_register(struct ida_loader *loader);