+/*
+ * Image Library -- Main header file
+ *
+ * (c) 2006 Pavel Charvat <pchar@ucw.cz>
+ *
+ * This software may be freely distributed and used according to the terms
+ * of the GNU Lesser General Public License.
+ */
+
#ifndef _IMAGES_IMAGES_H
#define _IMAGES_IMAGES_H
-#include "lib/mempool.h"
+#include <ucw/bbuf.h>
+
+#ifdef CONFIG_UCW_CLEAN_ABI
+#define image_channels_format_to_name ucw_image_channels_format_to_name
+#define image_clear ucw_image_clear
+#define image_clone ucw_image_clone
+#define image_context_cleanup ucw_image_context_cleanup
+#define image_context_init ucw_image_context_init
+#define image_context_msg ucw_image_context_msg
+#define image_context_msg_default ucw_image_context_msg_default
+#define image_context_msg_silent ucw_image_context_msg_silent
+#define image_context_vmsg ucw_image_context_vmsg
+#define image_destroy ucw_image_destroy
+#define image_dimensions_fit_to_box ucw_image_dimensions_fit_to_box
+#define image_extension_to_format ucw_image_extension_to_format
+#define image_file_name_to_format ucw_image_file_name_to_format
+#define image_format_to_extension ucw_image_format_to_extension
+#define image_init_matrix ucw_image_init_matrix
+#define image_init_subimage ucw_image_init_subimage
+#define image_io_cleanup ucw_image_io_cleanup
+#define image_io_init ucw_image_io_init
+#define image_io_read ucw_image_io_read
+#define image_io_read_data ucw_image_io_read_data
+#define image_io_read_header ucw_image_io_read_header
+#define image_io_reset ucw_image_io_reset
+#define image_io_write ucw_image_io_write
+#define image_max_bytes ucw_image_max_bytes
+#define image_max_dim ucw_image_max_dim
+#define image_name_to_channels_format ucw_image_name_to_channels_format
+#define image_new ucw_image_new
+#define image_scale ucw_image_scale
+#endif
-/* image.c */
+struct mempool;
+struct fastbuf;
-/* error handling */
-enum image_error {
- IMAGE_ERR_OK = 0,
- IMAGE_ERR_UNSPECIFIED,
- IMAGE_ERR_NOT_IMPLEMENTED,
- IMAGE_ERR_INVALID_DIMENSIONS,
- IMAGE_ERR_INVALID_FILE_FORMAT,
- IMAGE_ERR_INVALID_PIXEL_FORMAT,
- IMAGE_ERR_READ_FAILED,
- IMAGE_ERR_WRITE_FAILED,
- IMAGE_ERR_MAX
-};
+/* context.c
+ * - contexts with error/message handling
+ * - imagelib is thread-safe as long as threads work in different contexts */
-struct image_thread {
- byte *err_msg;
- enum image_error err_code;
- struct mempool *pool;
+struct image_context {
+ byte *msg; /* last message */
+ uint msg_code; /* last message code (see images/error.h for details) */
+ bb_t msg_buf; /* message buffer */
+ void (*msg_callback)(struct image_context *ctx); /* called for each message (in msg_{str,code}) */
+ uint tracing_level; /* tracing level (zero to disable) */
};
-void image_thread_init(struct image_thread *thread);
-void image_thread_cleanup(struct image_thread *thread);
+/* initialization/cleanup */
+void image_context_init(struct image_context *ctx);
+void image_context_cleanup(struct image_context *ctx);
-static inline void
-image_thread_flush(struct image_thread *thread)
-{
- thread->err_code = 0;
- thread->err_msg = NULL;
- mp_flush(thread->pool);
-}
+/* message handling, see images/error.h for useful macros */
+void image_context_msg(struct image_context *ctx, uint code, char *msg, ...);
+void image_context_vmsg(struct image_context *ctx, uint code, char *msg, va_list args);
-static inline void
-image_thread_err(struct image_thread *thread, uns code, char *msg)
-{
- thread->err_code = code;
- thread->err_msg = (byte *)msg;
-}
+/* default callback, displays messages with standard libucw's log() routine */
+void image_context_msg_default(struct image_context *ctx);
-static inline void
-image_thread_err_dup(struct image_thread *thread, uns code, char *msg)
-{
- thread->err_code = code;
- thread->err_msg = mp_strdup(thread->pool, msg);
-}
+/* empty callback */
+void image_context_msg_silent(struct image_context *ctx);
-void image_thread_err_format(struct image_thread *thread, uns code, char *msg, ...);
-/* basic image manupulation */
+/* image.c
+ * - basic manipulation with images
+ * - image structure is not directly connected to a single context
+ * but manipulation routines are (user must synchronize the access himself)! */
-#define IMAGE_MAX_SIZE 0xffffU /* maximum number of cols/rows, must be <(1<<16) */
-#define IMAGE_SSE_ALIGN_SIZE (MAX(16, sizeof(uns)))
+extern uint image_max_dim; /* ImageLib.ImageMaxDim */
+extern uint image_max_bytes; /* ImageLib.ImageMaxBytes */
-enum color_space {
- COLOR_SPACE_UNKNOWN,
- COLOR_SPACE_GRAYSCALE,
- COLOR_SPACE_RGB,
- COLOR_SPACE_MAX
-};
+/* SSE aligning size, see IMAGE_SSE_ALIGNED */
+#define IMAGE_SSE_ALIGN_SIZE 16
enum image_flag {
- IMAGE_COLOR_SPACE = 0x7, /* mask for enum color_space */
- IMAGE_ALPHA = 0x8, /* alpha channel */
- IMAGE_PIXELS_ALIGNED = 0x10, /* align pixel size to the nearest power of two */
- IMAGE_SSE_ALIGNED = 0x20, /* align scanlines to multiples of 16 bytes (both start and size) */
- IMAGE_NEED_DESTROY = 0x40, /* image is allocated with xmalloc */
- IMAGE_GAPS_PROTECTED = 0x80, /* cannot access gaps between rows */
+ IMAGE_COLOR_SPACE = 0xf, /* mask for enum color_space */
+ IMAGE_ALPHA = 0x10, /* alpha channel */
+ IMAGE_PIXELS_ALIGNED = 0x20, /* align pixel size to the nearest power of two */
+ IMAGE_SSE_ALIGNED = 0x40, /* align scanlines to multiples of 16 bytes (both start and size) */
+ IMAGE_NEED_DESTROY = 0x80, /* image is allocated with xmalloc */
+ IMAGE_GAPS_PROTECTED = 0x100, /* cannot access gaps between rows */
IMAGE_CHANNELS_FORMAT = IMAGE_COLOR_SPACE | IMAGE_ALPHA,
IMAGE_PIXEL_FORMAT = IMAGE_CHANNELS_FORMAT | IMAGE_PIXELS_ALIGNED,
IMAGE_ALIGNED = IMAGE_PIXELS_ALIGNED | IMAGE_SSE_ALIGNED,
IMAGE_INTERNAL_FLAGS = IMAGE_NEED_DESTROY | IMAGE_GAPS_PROTECTED,
};
+#define IMAGE_MAX_CHANNELS 4
+#define IMAGE_CHANNELS_FORMAT_MAX_SIZE 128
+byte *image_channels_format_to_name(uint format, byte *buf);
+uint image_name_to_channels_format(byte *name);
+
+struct color {
+ byte c[IMAGE_MAX_CHANNELS];
+ byte color_space;
+};
+
struct image {
- byte *pixels; /* left top pixel, there are at least sizeof(uns)
- unsed bytes after the buffer (possible optimizations) */
- u32 cols; /* number of columns */
- u32 rows; /* number of rows */
- u32 pixel_size; /* size of pixel (1, 2, 3 or 4) */
- u32 row_size; /* scanline size in bytes */
- u32 image_size; /* rows * row_size */
- u32 flags; /* enum image_flag */
+ byte *pixels; /* aligned top left pixel, there are at least sizeof(uint)
+ unused bytes after the buffer (possible optimizations) */
+ uint cols; /* number of columns */
+ uint rows; /* number of rows */
+ uint channels; /* number of color channels including the alpha channel */
+ uint pixel_size; /* size of pixel in bytes (1, 2, 3 or 4) */
+ uint row_size; /* scanline size in bytes */
+ uint row_pixels_size; /* scanline size in bytes excluding rows gaps */
+ uint image_size; /* rows * row_size */
+ uint flags; /* enum image_flag */
};
-struct image *image_new(struct image_thread *it, uns cols, uns rows, uns flags, struct mempool *pool);
-struct image *image_clone(struct image_thread *it, struct image *src, uns flags, struct mempool *pool);
+struct image *image_new(struct image_context *ctx, uint cols, uint rows, uint flags, struct mempool *pool);
+struct image *image_clone(struct image_context *ctx, struct image *src, uint flags, struct mempool *pool);
void image_destroy(struct image *img);
-void image_clear(struct image_thread *it, struct image *img);
-struct image *image_init_matrix(struct image_thread *it, struct image *img, byte *pixels, uns cols, uns rows, uns row_size, uns flags);
-struct image *image_init_subimage(struct image_thread *it, struct image *img, struct image *src, uns left, uns top, uns cols, uns rows);
+void image_clear(struct image_context *ctx, struct image *img);
+struct image *image_init_matrix(struct image_context *ctx, struct image *img, byte *pixels, uint cols, uint rows, uint row_size, uint flags);
+struct image *image_init_subimage(struct image_context *ctx, struct image *img, struct image *src, uint left, uint top, uint cols, uint rows);
-static inline int
-image_dimensions_valid(uns cols, uns rows)
+static inline int image_dimensions_valid(uint cols, uint rows)
{
- return cols && rows && cols <= IMAGE_MAX_SIZE && rows <= IMAGE_MAX_SIZE;
+ return cols && rows && cols <= image_max_dim && rows <= image_max_dim;
}
-
-byte *color_space_to_name(enum color_space cs);
-byte *image_channels_format_to_name(uns format);
-uns image_name_to_channels_format(byte *name);
-
-struct color {
- byte c[3];
- byte color_space;
-} PACKED;
-
/* scale.c */
-int image_scale(struct image_thread *thread, struct image *dest, struct image *src);
-void image_dimensions_fit_to_box(u32 *cols, u32 *rows, u32 max_cols, u32 max_rows, uns upsample);
-
-/* alpha.c */
-
-int image_apply_background(struct image_thread *thread, struct image *dest, struct image *src, struct color *background);
+int image_scale(struct image_context *ctx, struct image *dest, struct image *src);
+void image_dimensions_fit_to_box(uint *cols, uint *rows, uint max_cols, uint max_rows, uint upsample);
/* image-io.c */
};
struct image_io {
- /* R - read_header input */
- /* H - read_header output */
- /* I - read_data input */
- /* O - read_data output */
- /* W - write input */
+ /* R - read_header input */
+ /* H - read_header output */
+ /* I - read_data input */
+ /* O - read_data output */
+ /* W - write input */
struct image *image; /* [ OW] - image data */
enum image_format format; /* [R W] - file format (IMAGE_FORMAT_x) */
- struct fastbuf *fastbuf; /* [R W] - source/destination stream */
+ struct fastbuf *fastbuf; /* [R W] - source/destination stream */
struct mempool *pool; /* [ I ] - parameter to image_new */
- u32 cols; /* [ HI ] - number of columns, parameter to image_new */
- u32 rows; /* [ HI ] - number of rows, parameter to image_new */
- u32 flags; /* [ HI ] - see enum image_io_flags */
- u32 jpeg_quality; /* [ W] - JPEG compression quality (1..100) */
- u32 number_of_colors; /* [ H ] - number of image colors */
+ uint cols; /* [ HI ] - number of columns, parameter to image_new */
+ uint rows; /* [ HI ] - number of rows, parameter to image_new */
+ uint flags; /* [ HI ] - see enum image_io_flags */
+ uint jpeg_quality; /* [ W] - JPEG compression quality (1..100) */
+ uint number_of_colors; /* [ H ] - number of image colors */
struct color background_color; /* [ HI ] - background color, zero if undefined */
+ uint exif_size; /* [ H W] - EXIF size in bytes (zero if not present) */
+ byte *exif_data; /* [ H W] - EXIF data */
/* internals */
- struct image_thread *thread;
+ struct image_context *context;
struct mempool *internal_pool;
void *read_data;
void (*read_cancel)(struct image_io *io);
IMAGE_IO_NEED_DESTROY = 0x10000, /* [ O ] - enables automatic call of image_destroy */
IMAGE_IO_HAS_PALETTE = 0x20000, /* [ H ] - true for image with indexed colors */
IMAGE_IO_USE_BACKGROUND = 0x40000, /* [ I ] - merge transparent pixels with background_color */
+ IMAGE_IO_WANT_EXIF = 0x80000, /* [R ] - read EXIF data if present */
};
-int image_io_init(struct image_thread *it, struct image_io *io);
+int image_io_init(struct image_context *ctx, struct image_io *io);
void image_io_cleanup(struct image_io *io);
void image_io_reset(struct image_io *io);
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