"Fossies" - the Fresh Open Source Software Archive  

Source code changes of the file "src/gd_matrix.c" between
libgd-2.3.2.tar.gz and libgd-2.3.3.tar.gz

About: LibGD is a library for the dynamic creation of images by programmers (PNG, JPEG, GIF, WebP, XPM, BMP support).

gd_matrix.c  (libgd-2.3.2)	:	gd_matrix.c  (libgd-2.3.3)
skipping to change at line 15		skipping to change at line 15
#include "gd.h"		#include "gd.h"
#include <math.h>		#include <math.h>
#ifndef M_PI		#ifndef M_PI
# define M_PI 3.14159265358979323846		# define M_PI 3.14159265358979323846
#endif		#endif
/**		/**
* Title: Matrix		* Title: Matrix
* Group: Affine Matrix		* Group: Affine Matrix
*/		*
		* Matrix functions to initialize, transform and various other operations
		* on these matrices.
		* They can be used with gdTransformAffineCopy and are also used in various
		* transformations functions in GD.
		*
		* matrix are create using a 6 elements double array:
		* (start code)
		* matrix[0] == xx
		* matrix[1] == yx
		* matrix[2] == xy
		* matrix[3] == xy
		* matrix[4] == x0
		* matrix[5] == y0
		* (end code)
		* where the transformation of a given point (x,y) is given by:
		*
		* (start code)
		* x_new = xx * x + xy * y + x0;
		* y_new = yx * x + yy * y + y0;
		* (end code)
		*/
/**		/**
* Function: gdAffineApplyToPointF		* Function: gdAffineApplyToPointF
* Applies an affine transformation to a point (floating point		* Applies an affine transformation to a point (floating point
* gdPointF)		* gdPointF)
*		*
*		*
* Parameters:		* Parameters:
* dst - Where to store the resulting point		* dst - Where to store the resulting point
* affine - Source Point		* affine - Source Point
skipping to change at line 66		skipping to change at line 87
* See also:		* See also:
* <gdAffineIdentity>		* <gdAffineIdentity>
*		*
* Returns:		* Returns:
* GD_TRUE on success or GD_FALSE on failure		* GD_TRUE on success or GD_FALSE on failure
*/		*/
BGD_DECLARE(int) gdAffineInvert (double dst[6], const double src[6])		BGD_DECLARE(int) gdAffineInvert (double dst[6], const double src[6])
{		{
double r_det = (src[0] * src[3] - src[1] * src[2]);		double r_det = (src[0] * src[3] - src[1] * src[2]);
if (fabs(r_det) <= 0.0) {		if (!isfinite(r_det)) {
		return GD_FALSE;
		}
		if (r_det == 0) {
return GD_FALSE;		return GD_FALSE;
}		}
r_det = 1.0 / r_det;		r_det = 1.0 / r_det;
dst[0] = src[3] * r_det;		dst[0] = src[3] * r_det;
dst[1] = -src[1] * r_det;		dst[1] = -src[1] * r_det;
dst[2] = -src[2] * r_det;		dst[2] = -src[2] * r_det;
dst[3] = src[0] * r_det;		dst[3] = src[0] * r_det;
dst[4] = -src[4] * dst[0] - src[5] * dst[2];		dst[4] = -src[4] * dst[0] - src[5] * dst[2];
dst[5] = -src[4] * dst[1] - src[5] * dst[3];		dst[5] = -src[4] * dst[1] - src[5] * dst[3];
End of changes. 2 change blocks.
2 lines changed or deleted		26 lines changed or added

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