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- /*
- * "$Id: image.h,v 1.2 2005/10/18 02:08:16 rlk Exp $"
- *
- * libgimpprint image functions.
- *
- * Copyright 1997-2000 Michael Sweet (mike@easysw.com) and
- * Robert Krawitz (rlk@alum.mit.edu)
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the Free
- * Software Foundation; either version 2 of the License, or (at your option)
- * any later version.
- *
- * This program 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 General Public License
- * for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
-
- /**
- * @file gutenprint/image.h
- * @brief Image functions.
- */
-
- #ifndef GUTENPRINT_IMAGE_H
- #define GUTENPRINT_IMAGE_H
-
- #ifdef __cplusplus
- extern "C" {
- #endif
-
- /**
- * The image type is an abstract data type for interfacing with the
- * image creation program.
- *
- * @defgroup image image
- * @{
- */
-
- /*
- * Constants...
- */
-
- /*! The maximum number of channels. */
- #define STP_CHANNEL_LIMIT (32)
-
-
- /** Image status. */
- typedef enum
- {
- STP_IMAGE_STATUS_OK, /*!< Everything is OK. */
- STP_IMAGE_STATUS_ABORT /*!< An error occured, or the job was aborted. */
- } stp_image_status_t;
-
- /**
- * The image type is an abstract data type for interfacing with the
- * image creation program. It provides callbacks to functions defined
- * within the client application which are called while printing the
- * image.
- */
- typedef struct stp_image
- {
- /**
- * This callback is used to perform any initialization required by
- * the image layer for the image. It will be called once per image.
- * @param image the image in use.
- */
- void (*init)(struct stp_image *image);
- /**
- * This callback is called to reset the image to the beginning. It
- * may (in principle) be called multiple times if a page is being
- * printed more than once.
- * @warning The reset() call may be removed in the future.
- * @param image the image in use.
- */
- void (*reset)(struct stp_image *image);
- /**
- * This callback returns the width of the image in pixels.
- * @param image the image in use.
- */
- int (*width)(struct stp_image *image);
- /**
- * This callback returns the height of the image in pixels.
- * @param image the image in use.
- */
- int (*height)(struct stp_image *image);
- /**
- * This callback transfers the data from the image to the gimp-print
- * library. It is called from the driver layer. It should copy
- * WIDTH (as returned by the width() member) pixels of data into the
- * data buffer. It normally returns STP_IMAGE_STATUS_OK; if
- * something goes wrong, or the application wishes to stop producing
- * any further output (e. g. because the user cancelled the print
- * job), it should return STP_IMAGE_STATUS_ABORT. This will cause
- * the driver to flush any remaining data to the output. It will
- * always request rows in monotonically ascending order, but it may
- * skip rows (if, for example, the resolution of the input is higher
- * than the resolution of the output).
- * @param image the image in use.
- * @param data a pointer to width() bytes of pixel data.
- * @param byte_limit (image width * number of channels).
- * @param row (unused).
- */
- stp_image_status_t (*get_row)(struct stp_image *image, unsigned char *data,
- size_t byte_limit, int row);
-
- /**
- * This callback returns the name of the application. This is
- * embedded in the output by some drivers.
- */
- const char *(*get_appname)(struct stp_image *image);
- /**
- * This callback is called at the end of each page.
- */
- void (*conclude)(struct stp_image *image);
- /**
- * A pointer to an application-specific state information that might
- * need to be associated with the image object.
- */
- void *rep;
- } stp_image_t;
-
- extern void stp_image_init(stp_image_t *image);
- extern void stp_image_reset(stp_image_t *image);
- extern int stp_image_width(stp_image_t *image);
- extern int stp_image_height(stp_image_t *image);
- extern stp_image_status_t stp_image_get_row(stp_image_t *image,
- unsigned char *data,
- size_t limit, int row);
- extern const char *stp_image_get_appname(stp_image_t *image);
- extern void stp_image_conclude(stp_image_t *image);
-
- /** @} */
-
- #ifdef __cplusplus
- }
- #endif
-
- #endif /* GUTENPRINT_IMAGE_H */
- /*
- * End of "$Id: image.h,v 1.2 2005/10/18 02:08:16 rlk Exp $".
- */
-