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(*
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Copyright 2016, 2018, 2020 KolibriOS team
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This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*)
MODULE libimg;
IMPORT sys := SYSTEM, KOSAPI;
CONST
FLIP_VERTICAL *= 1;
FLIP_HORIZONTAL *= 2;
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ROTATE_90_CW *= 1;
ROTATE_180 *= 2;
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ROTATE_270_CW *= 3;
ROTATE_90_CCW *= ROTATE_270_CW;
ROTATE_270_CCW *= ROTATE_90_CW;
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// scale type corresponding img_scale params
LIBIMG_SCALE_INTEGER *= 1; // scale factor ; reserved 0
LIBIMG_SCALE_TILE *= 2; // new width ; new height
LIBIMG_SCALE_STRETCH *= 3; // new width ; new height
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LIBIMG_SCALE_FIT_RECT *= 4; // new width ; new height
LIBIMG_SCALE_FIT_WIDTH *= 5; // new width ; new height
LIBIMG_SCALE_FIT_HEIGHT *= 6; // new width ; new height
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LIBIMG_SCALE_FIT_MAX *= 7; // new width ; new height
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// interpolation algorithm
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LIBIMG_INTER_NONE *= 0; // use it with LIBIMG_SCALE_INTEGER, LIBIMG_SCALE_TILE, etc
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LIBIMG_INTER_BILINEAR *= 1;
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LIBIMG_INTER_DEFAULT *= LIBIMG_INTER_BILINEAR;
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// list of format id's
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LIBIMG_FORMAT_BMP *= 1;
LIBIMG_FORMAT_ICO *= 2;
LIBIMG_FORMAT_CUR *= 3;
LIBIMG_FORMAT_GIF *= 4;
LIBIMG_FORMAT_PNG *= 5;
LIBIMG_FORMAT_JPEG *= 6;
LIBIMG_FORMAT_TGA *= 7;
LIBIMG_FORMAT_PCX *= 8;
LIBIMG_FORMAT_XCF *= 9;
LIBIMG_FORMAT_TIFF *= 10;
LIBIMG_FORMAT_PNM *= 11;
LIBIMG_FORMAT_WBMP *= 12;
LIBIMG_FORMAT_XBM *= 13;
LIBIMG_FORMAT_Z80 *= 14;
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// encode flags (byte 0x02 of common option)
LIBIMG_ENCODE_STRICT_SPECIFIC *= 01H;
LIBIMG_ENCODE_STRICT_BIT_DEPTH *= 02H;
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LIBIMG_ENCODE_DELETE_ALPHA *= 08H;
LIBIMG_ENCODE_FLUSH_ALPHA *= 10H;
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// values for Image.Type
// must be consecutive to allow fast switch on Image.Type in support functions
bpp8i *= 1; // indexed
bpp24 *= 2;
bpp32 *= 3;
bpp15 *= 4;
bpp16 *= 5;
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bpp1 *= 6;
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bpp8g *= 7; // grayscale
bpp2i *= 8;
bpp4i *= 9;
bpp8a *= 10; // grayscale with alpha channel; application layer only!!! kernel doesn't handle this image type, libimg can only create and destroy such images
// bits in Image.Flags
IsAnimated *= 1;
TYPE
Image* = RECORD
Checksum *: INTEGER;
Width *: INTEGER;
Height *: INTEGER;
Next *: INTEGER;
Previous *: INTEGER;
Type *: INTEGER; // one of bppN
Data *: INTEGER;
Palette *: INTEGER; // used iff Type eq bpp1, bpp2, bpp4 or bpp8i
Extended *: INTEGER;
Flags *: INTEGER; // bitfield
Delay *: INTEGER // used iff IsAnimated is set in Flags
END;
ImageDecodeOptions* = RECORD
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UsedSize *: INTEGER; // if >=8, the field BackgroundColor is valid, and so on
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BackgroundColor *: INTEGER // used for transparent images as background
END;
FormatsTableEntry* = RECORD
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Format_id *: INTEGER;
Is *: INTEGER;
Decode *: INTEGER;
Encode *: INTEGER;
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Capabilities *: INTEGER
END;
VAR
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img_is_img *: PROCEDURE (data, length: INTEGER): INTEGER;
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img_to_rgb2 *: PROCEDURE (img: INTEGER; out: INTEGER);
(*
;;------------------------------------------------------------------------------------------------;;
;? decodes image data into RGB triplets and stores them where out points to ;;
;;------------------------------------------------------------------------------------------------;;
;> img = pointer to source image ;;
;> out = where to store RGB triplets ;;
;;================================================================================================;;
*)
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img_to_rgb *: PROCEDURE (img: INTEGER): INTEGER;
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(*
;;------------------------------------------------------------------------------------------------;;
;? decodes image data into RGB triplets and returns pointer to memory area containing them ;;
;;------------------------------------------------------------------------------------------------;;
;> img = pointer to source image ;;
;;------------------------------------------------------------------------------------------------;;
;< 0 / pointer to rgb_data (array of [rgb] triplets) ;;
;;================================================================================================;;
*)
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img_decode *: PROCEDURE (data, length, options: INTEGER): INTEGER;
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(*
;;------------------------------------------------------------------------------------------------;;
;? decodes loaded into memory graphic file ;;
;;------------------------------------------------------------------------------------------------;;
;> data = pointer to file in memory ;;
;> length = size in bytes of memory area pointed to by data ;;
;> options = 0 / pointer to the structure of additional options ;;
;;------------------------------------------------------------------------------------------------;;
;< 0 / pointer to image ;;
;;================================================================================================;;
*)
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img_encode *: PROCEDURE (img: INTEGER; common, specific: INTEGER): INTEGER;
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(*
;;------------------------------------------------------------------------------------------------;;
;? encode image to some format ;;
;;------------------------------------------------------------------------------------------------;;
;> img = pointer to input image ;;
;> common = some most important options ;;
; 0x00 : byte : format id ;;
; 0x01 : byte : fast encoding (0) / best compression ratio (255) ;;
; 0 : store uncompressed data (if supported both by the format and libimg) ;;
; 1 - 255 : use compression, if supported ;;
; this option may be ignored if any format specific options are defined ;;
; i.e. the 0 here will be ignored if some compression algorithm is specified ;;
; 0x02 : byte : flags (bitfield) ;;
; 0x01 : return an error if format specific conditions cannot be met ;;
; 0x02 : preserve current bit depth. means 8bpp/16bpp/24bpp and so on ;;
; 0x04 : delete alpha channel, if any ;;
; 0x08 : flush alpha channel with 0xff, if any; add it if none ;;
; 0x03 : byte : reserved, must be 0 ;;
;> specific = 0 / pointer to the structure of format specific options ;;
; see <format_name>.inc for description ;;
;;------------------------------------------------------------------------------------------------;;
;< 0 / pointer to encoded data ;;
;;================================================================================================;;
*)
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img_create *: PROCEDURE (width, height, _type: INTEGER): INTEGER;
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(*
;;------------------------------------------------------------------------------------------------;;
;? creates an Image structure and initializes some its fields ;;
;;------------------------------------------------------------------------------------------------;;
;> width = width of an image in pixels ;;
;> height = height of an image in pixels ;;
;> type = one of the bppN constants ;;
;;------------------------------------------------------------------------------------------------;;
;< 0 / pointer to image ;;
;;================================================================================================;;
*)
img_destroy *: PROCEDURE (img: INTEGER): BOOLEAN;
(*
;;------------------------------------------------------------------------------------------------;;
;? frees memory occupied by an image and all the memory regions its fields point to ;;
;? follows Previous/Next pointers and deletes all the images in sequence ;;
;;------------------------------------------------------------------------------------------------;;
;> img = pointer to image ;;
;;------------------------------------------------------------------------------------------------;;
;< FALSE (fail) / TRUE (success) ;;
;;================================================================================================;;
*)
img_destroy_layer *: PROCEDURE (img: INTEGER): BOOLEAN;
(*
;;------------------------------------------------------------------------------------------------;;
;? frees memory occupied by an image and all the memory regions its fields point to ;;
;? for image sequences deletes only one frame and fixes Previous/Next pointers ;;
;;------------------------------------------------------------------------------------------------;;
;> img = pointer to image ;;
;;------------------------------------------------------------------------------------------------;;
;< FALSE (fail) / TRUE (success) ;;
;;================================================================================================;;
*)
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img_count *: PROCEDURE (img: INTEGER): INTEGER;
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(*
;;------------------------------------------------------------------------------------------------;;
;? Get number of images in the list (e.g. in animated GIF file) ;;
;;------------------------------------------------------------------------------------------------;;
;> img = pointer to image ;;
;;------------------------------------------------------------------------------------------------;;
;< -1 (fail) / >0 (ok) ;;
;;================================================================================================;;
*)
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img_flip *: PROCEDURE (img: INTEGER; flip_kind: INTEGER): BOOLEAN;
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(*
;;------------------------------------------------------------------------------------------------;;
;? Flip all layers of image ;;
;;------------------------------------------------------------------------------------------------;;
;> img = pointer to image ;;
;> flip_kind = one of FLIP_* constants ;;
;;------------------------------------------------------------------------------------------------;;
;< FALSE / TRUE ;;
;;================================================================================================;;
*)
img_flip_layer *: PROCEDURE (img: INTEGER; flip_kind: INTEGER): BOOLEAN;
(*
;;------------------------------------------------------------------------------------------------;;
;? Flip image layer ;;
;;------------------------------------------------------------------------------------------------;;
;> img = pointer to image ;;
;> flip_kind = one of FLIP_* constants ;;
;;------------------------------------------------------------------------------------------------;;
;< FALSE / TRUE ;;
;;================================================================================================;;
*)
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img_rotate *: PROCEDURE (img: INTEGER; rotate_kind: INTEGER): BOOLEAN;
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(*
;;------------------------------------------------------------------------------------------------;;
;? Rotate all layers of image ;;
;;------------------------------------------------------------------------------------------------;;
;> img = pointer to image ;;
;> rotate_kind = one of ROTATE_* constants ;;
;;------------------------------------------------------------------------------------------------;;
;< FALSE / TRUE ;;
;;================================================================================================;;
*)
img_rotate_layer *: PROCEDURE (img: INTEGER; rotate_kind: INTEGER): BOOLEAN;
(*
;;------------------------------------------------------------------------------------------------;;
;? Rotate image layer ;;
;;------------------------------------------------------------------------------------------------;;
;> img = pointer to image ;;
;> rotate_kind = one of ROTATE_* constants ;;
;;------------------------------------------------------------------------------------------------;;
;< FALSE / TRUE ;;
;;================================================================================================;;
*)
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img_draw *: PROCEDURE (img: INTEGER; x, y, width, height, xpos, ypos: INTEGER);
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(*
;;------------------------------------------------------------------------------------------------;;
;? Draw image in the window ;;
;;------------------------------------------------------------------------------------------------;;
;> img = pointer to image ;;
;> x = x-coordinate in the window ;;
;> y = y-coordinate in the window ;;
;> width = maximum width to draw ;;
;> height = maximum height to draw ;;
;> xpos = offset in image by x-axis ;;
;> ypos = offset in image by y-axis ;;
;;================================================================================================;;
*)
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img_scale *: PROCEDURE (src: INTEGER; crop_x, crop_y, crop_width, crop_height: INTEGER; dst: INTEGER; scale, inter, param1, param2: INTEGER ): INTEGER;
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(*
;;------------------------------------------------------------------------------------------------;;
;? scale _image ;;
;;------------------------------------------------------------------------------------------------;;
;> src = pointer to source image ;;
;> crop_x = left coord of cropping rect ;;
;> crop_y = top coord of cropping rect ;;
;> crop_width = width of cropping rect ;;
;> crop_height = height of cropping rect ;;
;> dst = pointer to resulting image / 0 ;;
;> scale = how to change width and height. see libimg.inc ;;
;> inter = interpolation algorithm ;;
;> param1 = see libimg.inc ;;
;> param2 = see libimg.inc ;;
;;------------------------------------------------------------------------------------------------;;
;< 0 / pointer to scaled image ;;
;;================================================================================================;;
*)
img_convert *: PROCEDURE (src, dst: INTEGER; dst_type, flags, param: INTEGER);
(*
;;------------------------------------------------------------------------------------------------;;
;? scale _image ;;
;;------------------------------------------------------------------------------------------------;;
;> src = pointer to source image ;;
;> flags = see libimg.inc ;;
;> dst_type = the Image.Type of converted image ;;
;> dst = pointer to destination image, if any ;;
;;------------------------------------------------------------------------------------------------;;
;< 0 / pointer to converted image ;;
;;================================================================================================;;
*)
img_formats_table *: ARRAY 20 OF FormatsTableEntry;
PROCEDURE GetImageStruct* (img: INTEGER; VAR ImageStruct: Image): BOOLEAN;
BEGIN
IF img # 0 THEN
sys.MOVE(img, sys.ADR(ImageStruct), sys.SIZE(Image))
END
RETURN img # 0
END GetImageStruct;
PROCEDURE GetFormatsTable(ptr: INTEGER);
VAR i: INTEGER; eot: BOOLEAN;
BEGIN
i := 0;
REPEAT
sys.MOVE(ptr, sys.ADR(img_formats_table[i]), sys.SIZE(FormatsTableEntry));
ptr := ptr + sys.SIZE(FormatsTableEntry);
eot := img_formats_table[i].Format_id = 0;
INC(i)
UNTIL eot OR (i = LEN(img_formats_table))
END GetFormatsTable;
PROCEDURE main;
VAR Lib, formats_table_ptr: INTEGER;
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PROCEDURE GetProc(Lib, v: INTEGER; name: ARRAY OF CHAR);
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VAR a: INTEGER;
BEGIN
a := KOSAPI.GetProcAdr(name, Lib);
ASSERT(a # 0);
sys.PUT(v, a)
END GetProc;
BEGIN
Lib := KOSAPI.LoadLib("/rd/1/lib/libimg.obj");
ASSERT(Lib # 0);
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GetProc(Lib, sys.ADR(img_is_img) , "img_is_img");
GetProc(Lib, sys.ADR(img_to_rgb) , "img_to_rgb");
GetProc(Lib, sys.ADR(img_to_rgb2) , "img_to_rgb2");
GetProc(Lib, sys.ADR(img_decode) , "img_decode");
GetProc(Lib, sys.ADR(img_encode) , "img_encode");
GetProc(Lib, sys.ADR(img_create) , "img_create");
GetProc(Lib, sys.ADR(img_destroy) , "img_destroy");
GetProc(Lib, sys.ADR(img_destroy_layer) , "img_destroy_layer");
GetProc(Lib, sys.ADR(img_count) , "img_count");
GetProc(Lib, sys.ADR(img_flip) , "img_flip");
GetProc(Lib, sys.ADR(img_flip_layer) , "img_flip_layer");
GetProc(Lib, sys.ADR(img_rotate) , "img_rotate");
GetProc(Lib, sys.ADR(img_rotate_layer) , "img_rotate_layer");
GetProc(Lib, sys.ADR(img_draw) , "img_draw");
GetProc(Lib, sys.ADR(img_scale) , "img_scale");
GetProc(Lib, sys.ADR(img_convert) , "img_convert");
GetProc(Lib, sys.ADR(formats_table_ptr) , "img_formats_table");
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GetFormatsTable(formats_table_ptr)
END main;
BEGIN
main
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END libimg.
