src/inc/memgfx.h 1.25

Index: src/inc/memgfx.h
===================================================================
RCS file: /projects/compbio/cvsroot/kent/src/inc/memgfx.h,v
retrieving revision 1.24
retrieving revision 1.25
diff -b -B -U 1000000 -r1.24 -r1.25
--- src/inc/memgfx.h	19 Jun 2009 19:14:42 -0000	1.24
+++ src/inc/memgfx.h	5 Aug 2009 23:34:31 -0000	1.25
@@ -1,275 +1,287 @@
 /*****************************************************************************
  * Copyright (C) 2000 Jim Kent.  This source code may be freely used         *
  * for personal, academic, and non-profit purposes.  Commercial use          *
  * permitted only by explicit agreement with Jim Kent (jim_kent@pacbell.net) *
  *****************************************************************************/
 /* Memgfx - stuff to do graphics in memory buffers.
- * Typically will just write these out as .gif files.
+ * Typically will just write these out as .gif or .png files.
  * This stuff is byte-a-pixel for simplicity.
  * It can do 256 colors.
  */
 #ifndef MEMGFX_H
 #define MEMGFX_H
 
 #ifndef GFXPOLY_H
 #include "gfxPoly.h"
 #endif
 
 #define MG_WHITE 0
 #define MG_BLACK 1
 #define MG_RED 2
 #define MG_GREEN 3
 #define MG_BLUE 4
 #define MG_CYAN 5
 #define MG_MAGENTA 6
 #define MG_YELLOW 7
 #define MG_GRAY 8
 #define MG_FREE_COLORS_START 9
 
 
 typedef unsigned char Color;
 
 struct rgbColor
     {
     unsigned char r, g, b;
     };
 
 /* HSV and HSL structs can be used for changing lightness, darkness, or
  * color of RGB colors. Convert RGB->HS[LV], modify hue, saturation, or
  * value/lightness, then convert back to RGB.
  * The datatypes were chosen to be fast but also give accurate conversion
  * back to RGB.
  * Hue is a float [0,360) degrees 0=red, 120=green, 240=blue
  * S/V/L are integers [0,1000]
  */
 
 struct hsvColor
     {
     double h;
     unsigned short s, v;
     };
 
 struct hslColor
     {
     double h;
     unsigned short s, l;
     };
 
 extern struct rgbColor mgFixedColors[9];  /* Contains MG_WHITE - MG_GRAY */
 
 struct memGfx
     {
     Color *pixels;
     int width, height;
     struct rgbColor colorMap[256];
     int colorsUsed;
     int clipMinX, clipMaxX;
     int clipMinY, clipMaxY;
     struct colHash *colorHash;	/* Hash for fast look up of color. */
     };
 
 struct memGfx *mgNew(int width, int height);
 /* Get a new thing to draw on in memory. */
 
 void mgFree(struct memGfx **pmg);
 /* Free up memory raster. */
 
 void mgClearPixels(struct memGfx *mg);
 /* Set all pixels to background. */
 
 void mgSetClip(struct memGfx *mg, int x, int y, int width, int height);
 /* Set clipping rectangle. */
 
 void mgUnclip(struct memGfx *mg);
 /* Set clipping rect cover full thing. */
 
 Color mgFindColor(struct memGfx *mg, unsigned char r, unsigned char g, unsigned char b);
 /* Returns closest color in color map to rgb values.  If it doesn't
  * already exist in color map and there's room, it will create
  * exact color in map. */
 
 Color mgClosestColor(struct memGfx *mg, unsigned char r, unsigned char g, unsigned char b);
 /* Returns closest color in color map to r,g,b */
 
 Color mgAddColor(struct memGfx *mg, unsigned char r, unsigned char g, unsigned char b);
 /* Adds color to end of color map if there's room. */
 
 int mgColorsFree(struct memGfx *mg);
 /* Returns # of unused colors in color map. */
 
 
 #define _mgBpr(mg) ((mg)->width)
 /* Get what to add to get to next line */
 
 #define _mgPixAdr(mg,x,y) ((mg)->pixels+_mgBpr(mg) * (y) + (x))
 /* Get pixel address */
 
 #define _mgPutDot(mg, x, y, color) (*_mgPixAdr(mg,x,y) = (color))
 /* Unclipped plot a dot */
 
 #define _mgGetDot(mg, x, y) (*_mgPixAdr(mg,x,y))
 /* Unclipped get a dot, you do not want to use this, this is special for
  * verticalText only */
 
 #define mgPutDot(mg,x,y,color) if ((x)>=(mg)->clipMinX && (x) < (mg)->clipMaxX && (y)>=(mg)->clipMinY  && (y) < (mg)->clipMaxY) _mgPutDot(mg,x,y,color)
 /* Clipped put dot */
 
 #define mgGetDot(mg,x,y) ((x)>=(mg)->clipMinX && (x) < (mg)->clipMaxX && (y)>=(mg)->clipMinY  && (y) < (mg)->clipMaxY) ? _mgGetDot(mg,x,y) : 0
 /* Clipped get dot, you do not want to use this, this is special for
  * verticalText only */
 
 void mgPutSeg(struct memGfx *mg, int x, int y, int width, Color *dots);
 /* Put a series of dots starting at x, y and going to right width pixels. */
 
 void mgPutSegZeroClear(struct memGfx *mg, int x, int y, int width, Color *dots);
 /* Put a series of dots starting at x, y and going to right width pixels.
  * Don't put zero dots though. */
 
 void mgDrawBox(struct memGfx *mg, int x, int y, int width, int height, Color color);
 /* Draw a (horizontal) box */
 
 void mgDrawLine(struct memGfx *mg, int x1, int y1, int x2, int y2, Color color);
 /* Draw a line from one point to another. */
 
 void mgDrawHorizontalLine(struct memGfx *mg, int y1, Color color);
 /*special case of mgDrawLine*/
 
 void mgLineH(struct memGfx *mg, int y, int x1, int x2, Color color);
 /* Draw horizizontal line width pixels long starting at x/y in color */
 
 void mgSaveGif(struct memGfx *mg, char *name);
 /* Save memory bitmap as a gif. */
 
 boolean mgSaveToGif(FILE *gif_file, struct memGfx *screen);
 /* Save GIF to an already open file. */
 
 struct memGfx *mgLoadGif(char *name);
 /* Create memory image based on gif file. 
  * Note this is based on a very old gif reader
  * that only handles the GIF87a version. 
  * This is the same that mgSaveGif creates at
  * least.  This version of gif was always
  * color mapped. */
 
+void mgSavePng(struct memGfx *mg, char *filename, boolean useAlpha);
+/* Save memory bitmap to filename as a PNG.
+ * If useAlpha, then the first color in memgfx's colormap/palette is
+ * assumed to be the image background color, and pixels of that color
+ * are made transparent. */
+
+boolean mgSaveToPng(FILE *png_file, struct memGfx *mg, boolean useAlpha);
+/* Save PNG to an already open file.
+ * If useAlpha, then the first color in memgfx's colormap/palette is
+ * assumed to be the image background color, and pixels of that color
+ * are made transparent. */
+
 typedef void (*TextBlit)(int bitWidth, int bitHeight, int bitX, int bitY,
 	unsigned char *bitData, int bitDataRowBytes, 
 	struct memGfx *dest, int destX, int destY, 
 	Color color, Color backgroundColor);
 /* This defines the type of a function that takes a rectangular
  * area of a bitplane and expands it into a rectangular area
  * of a full color screen. */
 
 void mgTextBlit(int bitWidth, int bitHeight, int bitX, int bitY,
 	unsigned char *bitData, int bitDataRowBytes, 
 	struct memGfx *dest, int destX, int destY, 
 	Color color, Color backgroundColor);
 /* This function leaves the background as it was. */
 
 void mgTextBlitSolid(int bitWidth, int bitHeight, int bitX, int bitY,
 	unsigned char *bitData, int bitDataRowBytes, 
 	struct memGfx *dest, int destX, int destY, 
 	Color color, Color backgroundColor);
 /* This function sets the background to the background color. */
 
 typedef struct font_hdr MgFont;
 /* Type of our font.  */
 
 MgFont *mgTinyFont();
 MgFont *mgSmallFont();
 MgFont *mgMediumFont();
 MgFont *mgLargeFont();
 MgFont *mgHugeFont();
 MgFont *mgTinyBoldFont();
 MgFont *mgSmallBoldFont();
 MgFont *mgMediumBoldFont();
 MgFont *mgLargeBoldFont();
 MgFont *mgHugeBoldFont();
 MgFont *mgTinyFixedFont();
 MgFont *mgSmallFixedFont();
 MgFont *mgMediumFixedFont();
 MgFont *mgLargeFixedFont();
 MgFont *mgHugeFixedFont();
 
 void mgText(struct memGfx *mg, int x, int y, Color color, 
 	MgFont *font, char *text);
 /* Draw a line of text with upper left corner x,y. */
 
 void mgTextCentered(struct memGfx *mg, int x, int y, int width, int height, 
 	Color color, MgFont *font, char *text);
 /* Draw a line of text centered in box defined by x/y/width/height */
 
 void mgTextRight(struct memGfx *mg, int x, int y, int width, int height, 
 	Color color, MgFont *font, char *text);
 /* Draw a line of text right justified in box defined by x/y/width/height */
 
 int mgFontPixelHeight(MgFont *font);
 /* How high in pixels is font? */
 
 int mgFontLineHeight(MgFont *font);
 /* How many pixels to next line ideally? */
 
 int mgFontWidth(MgFont *font, char *chars, int charCount);
 /* How wide are a couple of letters? */
 
 int mgFontStringWidth(MgFont *font, char *string);
 /* How wide is a string? */
 
 int mgFontCharWidth(MgFont *font, char c);
 /* How wide is a character? */
 
 void mgFillUnder(struct memGfx *mg, int x1, int y1, int x2, int y2, 
 	int bottom, Color color);
 /* Draw a 4 sided filled figure that has line x1/y1 to x2/y2 at
  * it's top, a horizontal line at bottom at it's bottom,  and
  * vertical lines from the bottom to y1 on the left and bottom to
  * y2 on the right. */
 
 struct memGfx *mgRotate90(struct memGfx *in);
 /* Create a copy of input that is rotated 90 degrees clockwise. */
 
 void mgCircle(struct memGfx *mg, int xCen, int yCen, int rad, 
 	Color color, boolean filled);
 /* Draw a circle using a stepping algorithm.  Doesn't correct
  * for non-square pixels. */
 
 void mgDrawPoly(struct memGfx *mg, struct gfxPoly *poly, Color color,
 	boolean filled);
 /* Draw polygon, possibly filled in color. */
 
 struct hslColor mgRgbToHsl(struct rgbColor rgb);
 /* Convert RGB to HSL colorspace (see http://en.wikipedia.org/wiki/HSL_and_HSV) 
  * In HSL, Hue is the color in the range [0,360) with 0=red 120=green 240=blue,
  * Saturation goes from a shade of grey (0) to fully saturated color (1000), and
  * Lightness goes from black (0) through the hue (500) to white (1000). */
 
 struct hsvColor mgRgbToHsv(struct rgbColor rgb);
 /* Convert RGB to HSV colorspace (see http://en.wikipedia.org/wiki/HSL_and_HSV)
  * In HSV, Hue is the color in the range [0,360) with 0=red 120=green 240=blue,
  * Saturation goes from white (0) to fully saturated color (1000), and
  * Value goes from black (0) through to the hue (1000). */
 
 struct rgbColor mgHslToRgb(struct hslColor hsl);
 /* Convert HSL to RGB colorspace (see http://en.wikipedia.org/wiki/HSL_and_HSV) */
 
 struct rgbColor mgHsvToRgb(struct hsvColor hsv);
 /* Convert HSV to RGB colorspace (see http://en.wikipedia.org/wiki/HSL_and_HSV) */
 
 struct rgbColor mgRgbTransformHsl(struct rgbColor in, double h, double s, double l);
 /* Transform rgb 'in' value using
  *   hue shift 'h' (0..360 degrees), 
  *   saturation scale 's', and 
  *   lightness scale 'l'
  * Returns the transformed rgb value 
  * Use H=0, S=L=1 for identity transformation
  */
 
 struct rgbColor mgRgbTransformHsv(struct rgbColor in, double h, double s, double v);
 /* Transform rgb 'in' value using
  *   hue shift 'h' (0..360 degrees), 
  *   saturation scale 's', and 
  *   value scale 'v'
  * Returns the transformed rgb value 
  * Use H=0, S=V=1 for identity transformation
  */
 
 #endif /* MEMGFX_H */