173 lines
6 KiB
C
173 lines
6 KiB
C
/***************************************************************************
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gb.image.h
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(c) 2000-2017 Benoît Minisini <benoit.minisini@gambas-basic.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA.
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***************************************************************************/
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#ifndef __GB_IMAGE_H
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#define __GB_IMAGE_H
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#include "gambas.h"
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// Constants used by image data format
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#define GB_IMAGE_BGRX 0 // 00000
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#define GB_IMAGE_XRGB 1 // 00001
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#define GB_IMAGE_RGBX 2 // 00010
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#define GB_IMAGE_XBGR 3 // 00011
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#define GB_IMAGE_BGR 4 // 00100
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#define GB_IMAGE_RGB 5 // 00101
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#define GB_IMAGE_BGRA 8 // 01000
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#define GB_IMAGE_ARGB 9 // 01001
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#define GB_IMAGE_RGBA 10 // 01010
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#define GB_IMAGE_ABGR 11 // 01011
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#define GB_IMAGE_BGRP 24 // 11000
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#define GB_IMAGE_PRGB 25 // 11001
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#define GB_IMAGE_RGBP 26 // 11010
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#define GB_IMAGE_PBGR 27 // 11011
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// Format test functions
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#define GB_IMAGE_FMT_IS_24_BITS(_format) ((_format) & 4)
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#define GB_IMAGE_FMT_IS_32_BITS(_format) (((_format) & 4) == 0)
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#define GB_IMAGE_FMT_IS_RGBA(_format) ((_format) & 2)
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#define GB_IMAGE_FMT_IS_SWAPPED(_format) ((_format) & 1)
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#define GB_IMAGE_FMT_IS_TRANSPARENT(_format) ((_format) & 8)
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#define GB_IMAGE_FMT_IS_PREMULTIPLIED(_format) ((_format) & 16)
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#define GB_IMAGE_FMT_SET_PREMULTIPLIED(_format) ((_format) | 16)
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#define GB_IMAGE_FMT_CLEAR_PREMULTIPLIED(_format) ((_format) & ~16)
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// Image owner information
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struct GB_IMG;
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typedef
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struct {
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const char *name; // owner name (this is the name of the component)
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int format; // preferred format
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void (*free)(struct GB_IMG *img, void *handle); // free owner handle
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void (*release)(struct GB_IMG *img, void *handle); // free temporary handle
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void *(*temp)(struct GB_IMG *img); // create a temporary handle for an image and returns it
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void (*sync)(struct GB_IMG *img); // synchronize the data. Called only if the GB_IMG.sync flag is set
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}
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GB_IMG_OWNER;
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// Gambas image
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typedef
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struct GB_IMG {
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GB_BASE ob;
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unsigned char *data; // points at the image data
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int width; // image width in pixels
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int height; // image height in pixels
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int format; // image format (RGB, BGR, RGBA...)
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GB_IMG_OWNER *owner; // owner of the data, NULL means gb.image
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void *owner_handle; // handle for the owner
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GB_IMG_OWNER *temp_owner; // owner of the temporary handle that does not own the data
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void *temp_handle; // temporary handle
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unsigned modified : 1; // data has been modified by gb.image
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unsigned sync : 1; // data must be synchronized by calling GB_IMG_OWNER.sync()
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unsigned is_void : 1; // void image (no data)
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}
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GB_IMG;
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#ifndef __GB_IMAGE_DEFINED
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#define __GB_IMAGE_DEFINED
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typedef
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void *GB_IMAGE;
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#endif
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// Pixel color: the color is not premultiplied, and the alpha component is inverted (0 = solid / 255 = transparent)
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#ifndef __GB_COLOR_DEFINED
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#define __GB_COLOR_DEFINED
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typedef
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unsigned int GB_COLOR;
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#endif
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// Split a color into its component. Uninvert the alpha component
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#define GB_COLOR_SPLIT(_color, _r, _g, _b, _a) \
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({ \
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uint _c = (uint)(_color); \
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_b = _c & 0xFF; \
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_g = (_c >> 8) & 0xFF; \
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_r = (_c >> 16) & 0xFF; \
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_a = (_c >> 24) ^ 0xFF; \
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})
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// Create a GB_COLOR from rgba components
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#define GB_COLOR_MAKE(_r, _g, _b, _a) (((_b) & 0xFF) | (((_g) & 0xFF) << 8) | (((_r) & 0xFF) << 16) | ((((_a) & 0xFF) ^ 0xFF) << 24))
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// Gambas image component interface
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#define IMAGE_INTERFACE_VERSION 1
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typedef
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struct {
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intptr_t version;
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// Create an image
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GB_IMG *(*Create)(int width, int height, int format, unsigned char *data);
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// Take image ownership by giving the image handle and information
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void (*Take)(GB_IMG *img, GB_IMG_OWNER *owner, void *owner_handle, int width, int height, unsigned char *data);
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// Create a temporary handle on the image without becoming the owner.
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void *(*Check)(GB_IMG *img, GB_IMG_OWNER *temp_owner);
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// Synchronize the image data if needed
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void (*Synchronize)(GB_IMG *img);
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// Return the size of the image data in bytes
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int (*Size)(GB_IMG *img);
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// Set the default format used when creating images
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void (*SetDefaultFormat)(int format);
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// Get the default format used when creating images
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int (*GetDefaultFormat)(void);
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// Get the color of a pixel
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GB_COLOR (*GetPixel)(GB_IMG *img, int x, int y);
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// Converts an image to one of the following formats: BGRA, RGBA, BGRP, RGBP
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void (*Convert)(GB_IMG *img, int format);
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// Merge two colors
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GB_COLOR (*MergeColor)(GB_COLOR col1, GB_COLOR col2, double weight);
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// Make a color lighter
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GB_COLOR (*LighterColor)(GB_COLOR col);
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// Make a color darker
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GB_COLOR (*DarkerColor)(GB_COLOR col);
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// Return the image format as a string
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const char *(*FormatToString)(int format);
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// Return the luminance of a color
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int (*GetLuminance)(GB_COLOR col);
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}
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IMAGE_INTERFACE;
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#define GB_IMG_HANDLE(_image) ((_image)->temp_handle)
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#define SYNCHRONIZE_IMAGE(_image) (IMAGE.Synchronize(_image))
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#define MODIFY_IMAGE(_image) ((_image)->modified = 1)
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#define COLOR_DEFAULT ((GB_COLOR)-1)
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#define GB_COLOR_DEFAULT ((GB_COLOR)-1)
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#endif
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