X-Git-Url: http://mj.ucw.cz/gitweb/?a=blobdiff_plain;ds=sidebyside;f=images%2Fimages.h;h=d555ce529f3b48094b92dcd18f981f1b35c87716;hb=25541ea3bb96e9f143f0e23f8ac5b432f2f6f47a;hp=4f2bd2aa562dd35b2b7d403e781d38d29983cb51;hpb=19b12adae1eafc2b9fde886157ab3a35d80705dc;p=libucw.git diff --git a/images/images.h b/images/images.h index 4f2bd2aa..d555ce52 100644 --- a/images/images.h +++ b/images/images.h @@ -1,16 +1,170 @@ +/* + * Image Library -- Main header file + * + * (c) 2006 Pavel Charvat + * + * 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 "ucw/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_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, +}; + +#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 */ - byte *pixels; /* RGB */ }; -#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