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Document gdImageCompare()

master
Christoph M. Becker 2016-10-06 18:28:46 +02:00
parent b697bf74db
commit 4ebdb483e4
2 changed files with 39 additions and 12 deletions
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16
src/gd.c
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@ -3941,9 +3941,19 @@ BGD_DECLARE(void) gdImageInterlace (gdImagePtr im, int interlaceArg)
im->interlace = interlaceArg;
}
/*
Function: gdImageCompare
*/
/**
* Function: gdImageCompare
*
* Compare two images
*
* Parameters:
* im1 - An image.
* im2 - Another image.
*
* Returns:
* A bitmask of <Image Comparison> flags where each set flag signals
* which attributes of the images are different.
*/
BGD_DECLARE(int) gdImageCompare (gdImagePtr im1, gdImagePtr im2)
{
int x, y;

35
src/gd.h
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@ -1581,15 +1581,32 @@ gdTransformAffineCopy(gdImagePtr dst, int x0, int y0, int x1, int y1,
*/
BGD_DECLARE(int) gdTransformAffineBoundingBox(gdRectPtr src, const double affine[6], gdRectPtr bbox);
#define GD_CMP_IMAGE 1 /* Actual image IS different */
#define GD_CMP_NUM_COLORS 2 /* Number of Colours in pallette differ */
#define GD_CMP_COLOR 4 /* Image colours differ */
#define GD_CMP_SIZE_X 8 /* Image width differs */
#define GD_CMP_SIZE_Y 16 /* Image heights differ */
#define GD_CMP_TRANSPARENT 32 /* Transparent colour */
#define GD_CMP_BACKGROUND 64 /* Background colour */
#define GD_CMP_INTERLACE 128 /* Interlaced setting */
#define GD_CMP_TRUECOLOR 256 /* Truecolor vs palette differs */
/**
* Group: Image Comparison
*
* Constants:
* GD_CMP_IMAGE - Actual image IS different
* GD_CMP_NUM_COLORS - Number of colors in pallette differ
* GD_CMP_COLOR - Image colors differ
* GD_CMP_SIZE_X - Image width differs
* GD_CMP_SIZE_Y - Image heights differ
* GD_CMP_TRANSPARENT - Transparent color differs
* GD_CMP_BACKGROUND - Background color differs
* GD_CMP_INTERLACE - Interlaced setting differs
* GD_CMP_TRUECOLOR - Truecolor vs palette differs
*
* See also:
* - <gdImageCompare>
*/
#define GD_CMP_IMAGE 1
#define GD_CMP_NUM_COLORS 2
#define GD_CMP_COLOR 4
#define GD_CMP_SIZE_X 8
#define GD_CMP_SIZE_Y 16
#define GD_CMP_TRANSPARENT 32
#define GD_CMP_BACKGROUND 64
#define GD_CMP_INTERLACE 128
#define GD_CMP_TRUECOLOR 256
/* resolution affects ttf font rendering, particularly hinting */
#define GD_RESOLUTION 96 /* pixels per inch */