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74 lines
2.3 KiB
C
74 lines
2.3 KiB
C
#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef GDFX_H
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#define GDFX_H 1
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#include "gd.h"
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/* im MUST be square, but can have any size. Returns a new image
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of width and height radius * 2, in which the X axis of
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the original has been remapped to theta (angle) and the Y axis
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of the original has been remapped to rho (distance from center).
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This is known as a "polar coordinate transform." */
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BGD_DECLARE(gdImagePtr) gdImageSquareToCircle(gdImagePtr im, int radius);
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/* Draws the text 'top' and 'bottom' on 'im', curved along the
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edge of a circle of radius 'radius', with its
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center at 'cx' and 'cy'. 'top' is written clockwise
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along the top; 'bottom' is written counterclockwise
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along the bottom. 'textRadius' determines the 'height'
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of each character; if 'textRadius' is 1/2 of 'radius',
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characters extend halfway from the edge to the center.
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'fillPortion' varies from 0 to 1.0, with useful values
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from about 0.4 to 0.9, and determines how much of the
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180 degrees of arc assigned to each section of text
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is actually occupied by text; 0.9 looks better than
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1.0 which is rather crowded. 'font' is a freetype
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font; see gdImageStringFT. 'points' is passed to the
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freetype engine and has an effect on hinting; although
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the size of the text is determined by radius, textRadius,
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and fillPortion, you should pass a point size that
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'hints' appropriately -- if you know the text will be
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large, pass a large point size such as 24.0 to get the
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best results. 'fgcolor' can be any color, and may have
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an alpha component, do blending, etc.
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Returns 0 on success, or an error string. */
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BGD_DECLARE(char *) gdImageStringFTCircle(
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gdImagePtr im,
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int cx,
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int cy,
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double radius,
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double textRadius,
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double fillPortion,
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char *font,
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double points,
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char *top,
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char *bottom,
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int fgcolor);
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/* 2.0.16:
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* Sharpen function added on 2003-11-19
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* by Paul Troughton (paul<dot>troughton<at>ieee<dot>org)
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* Simple 3x3 convolution kernel
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* Makes use of seperability
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* Faster, but less flexible, than full-blown unsharp masking
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* pct is sharpening percentage, and can be greater than 100
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* Silently does nothing to non-truecolor images
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* Silently does nothing for pct<0, as not a useful blurring function
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* Leaves transparency/alpha-channel untouched
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*/
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BGD_DECLARE(void) gdImageSharpen (gdImagePtr im, int pct);
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#endif /* GDFX_H */
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#ifdef __cplusplus
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}
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#endif
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