#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(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) */
- u32 cols; /* number of columns */
- u32 rows; /* number of rows */
- u32 pixel_size; /* size of pixel in bytes (1, 2, 3 or 4) */
- u32 row_size; /* scanline size in bytes */
- u32 row_pixels_size; /* scanline size in bytes excluding rows gaps */
- u32 image_size; /* rows * row_size */
- u32 flags; /* enum image_flag */
+ 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 */
};
struct image *image_new(struct image_context *ctx, uns cols, uns rows, uns flags, struct mempool *pool);
{
return cols && rows && cols <= image_max_dim && rows <= image_max_dim;
}
-
-byte *color_space_to_name(uns 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_context *ctx, 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_context *ctx, struct image *dest, struct image *src, struct color *background);
+void image_dimensions_fit_to_box(uns *cols, uns *rows, uns max_cols, uns max_rows, uns 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 */
+ 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 */
-#ifdef CONFIG_IMAGES_EXIF
- u32 exif_size; /* [ H W] - EXIF size in bytes (zero if not present) */
+ uns exif_size; /* [ H W] - EXIF size in bytes (zero if not present) */
byte *exif_data; /* [ H W] - EXIF data */
-#endif
/* internals */
struct image_context *context;
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 */
-#ifdef CONFIG_IMAGES_EXIF
IMAGE_IO_WANT_EXIF = 0x80000, /* [R ] - read EXIF data if present */
-#endif
};
int image_io_init(struct image_context *ctx, struct image_io *io);
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