+/*
+ * 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/bbuf.h"
+
+struct mempool;
+struct fastbuf;
+
+
+/* context.c
+ * - contexts with error/message handling
+ * - imagelib is thread-safe as long as threads work in different contexts */
+
+struct image_context {
+ byte *msg; /* last message */
+ uns 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}) */
+ uns tracing_level; /* tracing level (zero to disable) */
+};
+
+/* initialization/cleanup */
+void image_context_init(struct image_context *ctx);
+void image_context_cleanup(struct image_context *ctx);
+
+/* message handling, see images/error.h for useful macros */
+void image_context_msg(struct image_context *ctx, uns code, char *msg, ...);
+void image_context_vmsg(struct image_context *ctx, uns code, char *msg, va_list args);
+
+/* default callback, displays messages with standard libucw's log() routine */
+void image_context_msg_default(struct image_context *ctx);
+
+/* empty callback */
+void image_context_msg_silent(struct image_context *ctx);
+
+
+/* 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)! */
+
+extern uns image_max_dim; /* ImageLib.ImageMaxDim */
+extern uns image_max_bytes; /* ImageLib.ImageMaxBytes */
+
+/* SSE aligning size, see IMAGE_SSE_ALIGNED */
+#define IMAGE_SSE_ALIGN_SIZE 16
+
enum image_flag {
- IMAGE_GRAYSCALE = 0x1, /* grayscale image */
- IMAGE_ALPHA = 0x2, /* alpha present */
+ 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_NEW_FLAGS = IMAGE_PIXEL_FORMAT | IMAGE_SSE_ALIGNED,
+ IMAGE_INTERNAL_FLAGS = IMAGE_NEED_DESTROY | IMAGE_GAPS_PROTECTED,
};
-struct pixel {
- byte r, g, b, a;
-} PACKED;
+#define IMAGE_MAX_CHANNELS 4
+#define IMAGE_CHANNELS_FORMAT_MAX_SIZE 128
+byte *image_channels_format_to_name(uns format, byte *buf);
+uns image_name_to_channels_format(byte *name);
+
+struct color {
+ byte c[IMAGE_MAX_CHANNELS];
+ byte color_space;
+};
struct image {
+ byte *pixels; /* aligned top left pixel, there are at least sizeof(uns)
+ unused bytes after the buffer (possible optimizations) */
+ uns cols; /* number of columns */
+ uns rows; /* number of rows */
+ uns channels; /* number of color channels including the alpha channel */
+ uns pixel_size; /* size of pixel in bytes (1, 2, 3 or 4) */
+ uns row_size; /* scanline size in bytes */
+ uns row_pixels_size; /* scanline size in bytes excluding rows gaps */
+ uns image_size; /* rows * row_size */
uns flags; /* enum image_flag */
- uns width; /* number of columns */
- uns height; /* number of rows */
- struct pixel *pixels; /* RGBA */
};
-#endif
+struct image *image_new(struct image_context *ctx, uns cols, uns rows, uns flags, struct mempool *pool);
+struct image *image_clone(struct image_context *ctx, struct image *src, uns flags, struct mempool *pool);
+void image_destroy(struct image *img);
+void image_clear(struct image_context *ctx, struct image *img);
+struct image *image_init_matrix(struct image_context *ctx, struct image *img, byte *pixels, uns cols, uns rows, uns row_size, uns flags);
+struct image *image_init_subimage(struct image_context *ctx, struct image *img, struct image *src, uns left, uns top, uns cols, uns rows);
+
+static inline int
+image_dimensions_valid(uns cols, uns rows)
+{
+ return cols && rows && cols <= image_max_dim && rows <= image_max_dim;
+}
+/* scale.c */
+
+int image_scale(struct image_context *ctx, struct image *dest, struct image *src);
+void image_dimensions_fit_to_box(uns *cols, uns *rows, uns max_cols, uns max_rows, uns upsample);
+/* image-io.c */
+
+enum image_format {
+ IMAGE_FORMAT_UNDEFINED,
+ IMAGE_FORMAT_JPEG,
+ IMAGE_FORMAT_PNG,
+ IMAGE_FORMAT_GIF,
+ IMAGE_FORMAT_MAX
+};
+
+struct image_io {
+ /* 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 mempool *pool; /* [ I ] - parameter to image_new */
+ uns cols; /* [ HI ] - number of columns, parameter to image_new */
+ uns rows; /* [ HI ] - number of rows, parameter to image_new */
+ uns flags; /* [ HI ] - see enum image_io_flags */
+ uns jpeg_quality; /* [ W] - JPEG compression quality (1..100) */
+ uns number_of_colors; /* [ H ] - number of image colors */
+ struct color background_color; /* [ HI ] - background color, zero if undefined */
+ uns exif_size; /* [ H W] - EXIF size in bytes (zero if not present) */
+ byte *exif_data; /* [ H W] - EXIF data */
+
+ /* internals */
+ struct image_context *context;
+ struct mempool *internal_pool;
+ void *read_data;
+ void (*read_cancel)(struct image_io *io);
+};
+
+enum image_io_flags {
+ IMAGE_IO_IMAGE_FLAGS = 0xffff, /* [ HI ] - mask of parameters to image new, read_header fills IMAGE_CHANNELS_FORMAT */
+ 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_context *ctx, struct image_io *io);
+void image_io_cleanup(struct image_io *io);
+void image_io_reset(struct image_io *io);
+
+int image_io_read_header(struct image_io *io);
+struct image *image_io_read_data(struct image_io *io, int ref);
+struct image *image_io_read(struct image_io *io, int ref);
+
+int image_io_write(struct image_io *io);
+
+byte *image_format_to_extension(enum image_format format);
+enum image_format image_extension_to_format(byte *extension);
+enum image_format image_file_name_to_format(byte *file_name);
+
+#endif
projects / libucw.git / blobdiff