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scottc
364
wrlib/wraster.h
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364
wrlib/wraster.h
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/*
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* Raster graphics library
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*
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* Copyright (c) 1997, 1998 Alfredo K. Kojima
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/*
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* Environment variables:
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*
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* WRASTER_GAMMA <rgamma>/<ggamma>/<bgamma>
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* gamma correction value. Must be greater than 0
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* Only for PseudoColor visuals.
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*
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* Default:
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* WRASTER_GAMMA 1/1/1
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*
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*
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* If you want a specific value for a screen, append the screen number
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* preceded by a hash to the variable name as in
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* WRASTER_GAMMA#1
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* for screen number 1
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*/
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#ifndef RLRASTER_H_
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#define RLRASTER_H_
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/* version of the header for the library: 0.8 */
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#define WRASTER_HEADER_VERSION 8
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#ifdef HAVE_ALLOCA_H
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#include <alloca.h>
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#endif
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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#ifdef XSHM
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#include <X11/extensions/XShm.h>
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#endif
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/* RM_MATCH or RM_DITHER */
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#define RC_RenderMode (1<<0)
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/* number of colors per channel for colormap in PseudoColor mode */
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#define RC_ColorsPerChannel (1<<1)
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/* do gamma correction */
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#define RC_GammaCorrection (1<<2)
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/* visual id to use */
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#define RC_VisualID (1<<3)
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/* shared memory usage */
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#define RC_UseSharedMemory (1<<4)
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/* use default instead of best visual */
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#define RC_DefaultVisual (1<<5)
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typedef struct RContextAttributes {
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int flags;
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int render_mode;
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int colors_per_channel; /* for PseudoColor */
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float rgamma; /* gamma correction for red, */
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float ggamma; /* green, */
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float bgamma; /* and blue */
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VisualID visualid; /* visual ID to use */
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int use_shared_memory; /* True of False */
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} RContextAttributes;
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/*
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* describes a screen in terms of depth, visual, number of colors
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* we can use, if we should do dithering, and what colors to use for
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* dithering.
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*/
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typedef struct RContext {
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Display *dpy;
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int screen_number;
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Colormap cmap;
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RContextAttributes *attribs;
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GC copy_gc;
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Visual *visual;
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int depth;
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Window drawable; /* window to pass for XCreatePixmap().*/
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/* generally = root */
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int vclass;
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unsigned long black;
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unsigned long white;
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int red_offset; /* only used in 24bpp */
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int green_offset;
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int blue_offset;
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/* only used for pseudocolor and grayscale */
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int ncolors; /* total number of colors we can use */
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XColor *colors; /* internal colormap */
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} RContext;
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typedef struct RColor {
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unsigned char red;
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unsigned char green;
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unsigned char blue;
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unsigned char alpha;
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} RColor;
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typedef struct RHSVColor {
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unsigned short hue; /* 0-359 */
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unsigned char saturation; /* 0-255 */
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unsigned char value; /* 0-255 */
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} RHSVColor;
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typedef struct RPoint {
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int x, y;
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} RPoint;
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typedef struct RSegment {
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int x1, y1, x2, y2;
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} RSegment;
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/*
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* internal 24bit+alpha image representation
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*/
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typedef struct RImage {
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unsigned width, height; /* size of the image */
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RColor background; /* background color */
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unsigned char *data[4]; /* image data (R,G,B,A) */
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} RImage;
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/*
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* internal wrapper for XImage. Used for shm abstraction
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*/
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typedef struct RXImage {
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XImage *image;
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#ifdef XSHM
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XShmSegmentInfo info;
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int is_shared;
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#endif
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} RXImage;
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/* note that not all operations are supported in all functions */
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enum {
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RClearOperation, /* clear with 0 */
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RCopyOperation,
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RNormalOperation, /* same as combine */
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RAddOperation,
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RSubtractOperation
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};
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/* image display modes */
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enum {
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RDitheredRendering = 0,
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RBestMatchRendering = 1
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};
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/* bw compat */
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#define RM_DITHER RDitheredRendering
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#define RM_MATCH RBestMatchRendering
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enum {
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RAbsoluteCoordinates = 0,
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RRelativeCoordinates = 1
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};
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enum {
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RSunkenBevel = -1,
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RRaisedBevel = 1
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};
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/* bw compat */
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#define RBEV_SUNKEN RSunkenBevel
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/* 1 pixel wide */
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#define RBEV_RAISED RRaisedBevel
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/* 1 pixel wide on top/left 2 on bottom/right */
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#define RBEV_RAISED2 2
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/* 2 pixel width */
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#define RBEV_RAISED3 3
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enum {
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RHorizontalGradient = 2,
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RVerticalGradient = 3,
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RDiagonalGradient = 4
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};
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/* for backwards compatibility */
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#define RGRD_HORIZONTAL RHorizontalGradient
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#define RGRD_VERTICAL RVerticalGradient
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#define RGRD_DIAGONAL RDiagonalGradient
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/*
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* Returns a NULL terminated array of strings containing the
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* supported formats, such as: TIFF, XPM, PNG, JPEG, PPM, GIF
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*/
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char **RSupportedFileFormats(void);
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void RFreeStringList(char **list);
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/*
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* Xlib contexts
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*/
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RContext *RCreateContext(Display *dpy, int screen_number,
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RContextAttributes *attribs);
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Bool RGetClosestXColor(RContext *context, RColor *color, XColor *retColor);
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/*
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* RImage creation
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*/
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RImage *RCreateImage(unsigned width, unsigned height, int alpha);
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RImage *RCreateImageFromXImage(RContext *context, XImage *image, XImage *mask);
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RImage *RCreateImageFromDrawable(RContext *context, Drawable drawable,
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Pixmap mask);
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RImage *RLoadImage(RContext *context, char *file, int index);
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void RDestroyImage(RImage *image);
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RImage *RGetImageFromXPMData(RContext *context, char **data);
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/*
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* Area manipulation
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*/
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RImage *RCloneImage(RImage *image);
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RImage *RGetSubImage(RImage *image, int x, int y, unsigned width,
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unsigned height);
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void RCombineImageWithColor(RImage *image, RColor *color);
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void RCombineImages(RImage *image, RImage *src);
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void RCombineArea(RImage *image, RImage *src, int sx, int sy, unsigned width,
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unsigned height, int dx, int dy);
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void RCombineImagesWithOpaqueness(RImage *image, RImage *src, int opaqueness);
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void RCombineAreaWithOpaqueness(RImage *image, RImage *src, int sx, int sy,
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unsigned width, unsigned height, int dx, int dy,
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int opaqueness);
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RImage *RScaleImage(RImage *image, unsigned new_width, unsigned new_height);
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RImage *RMakeTiledImage(RImage *tile, unsigned width, unsigned height);
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RImage* RMakeCenteredImage(RImage *image, unsigned width, unsigned height,
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RColor *color);
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/*
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* Drawing
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*/
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Bool RGetPixel(RImage *image, int x, int y, RColor *color);
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void RPutPixel(RImage *image, int x, int y, RColor *color);
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void ROperatePixel(RImage *image, int operation, int x, int y, RColor *color);
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void RPutPixels(RImage *image, RPoint *points, int npoints, int mode,
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RColor *color);
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void ROperatePixels(RImage *image, int operation, RPoint *points,
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int npoints, int mode, RColor *color);
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int RDrawLine(RImage *image, int x0, int y0, int x1, int y1, RColor *color);
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int ROperateLine(RImage *image, int operation, int x0, int y0, int x1, int y1,
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RColor *color);
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void RDrawLines(RImage *image, RPoint *points, int npoints, int mode,
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RColor *color);
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void ROperateLines(RImage *image, int operation, RPoint *points, int npoints,
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int mode, RColor *color);
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void RDrawSegments(RImage *image, RSegment *segs, int nsegs, RColor *color);
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void ROperateSegments(RImage *image, int operation, RSegment *segs, int nsegs,
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RColor *color);
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/*
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* Color convertion
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*/
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void RRGBtoHSV(RColor *color, RHSVColor *hsv);
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void RHSVtoRGB(RHSVColor *hsv, RColor *rgb);
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/*
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* Painting
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*/
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int RClearImage(RImage *image, RColor *color);
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int RBevelImage(RImage *image, int bevel_type);
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RImage *RRenderGradient(unsigned width, unsigned height, RColor *from,
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RColor *to, int style);
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RImage *RRenderMultiGradient(unsigned width, unsigned height, RColor **colors,
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int style);
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/*
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* Convertion into X Pixmaps
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*/
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int RConvertImage(RContext *context, RImage *image, Pixmap *pixmap);
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int RConvertImageMask(RContext *context, RImage *image, Pixmap *pixmap,
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Pixmap *mask, int threshold);
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/*
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* misc. utilities
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*/
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RXImage *RCreateXImage(RContext *context, int depth,
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unsigned width, unsigned height);
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void RDestroyXImage(RContext *context, RXImage *ximage);
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void RPutXImage(RContext *context, Drawable d, GC gc, RXImage *ximage,
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int src_x, int src_y, int dest_x, int dest_y,
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unsigned width, unsigned height);
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/****** Global Variables *******/
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/*
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* Where error strings are stored
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*/
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extern char RErrorString[];
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#endif
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