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[libpng16] Imported from libpng-1.6.0beta25.tar

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This commit is contained in:
Glenn Randers-Pehrson
2012-06-16 13:07:05 -05:00
parent 96b917056d
commit fc58b17772
13 changed files with 36 additions and 36 deletions
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38
contrib/libtests/pngstest.c
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@@ -39,7 +39,7 @@
/* KNOWN ISSUES
*
* These defines switch on alternate algorithms for format convertions to match
* These defines switch on alternate algorithms for format conversions to match
* the current libpng implementation; they are set to allow pngstest to pass
* even though libpng is producing answers that are not as correct as they
* should be.
@@ -124,7 +124,7 @@ u16d(double d)
}
/* sRGB support: use exact calculations rounded to the nearest int, see the
* fesetround() call in main(). sRGB_to_d optimizes the 8 to 16-bit convertion.
* fesetround() call in main(). sRGB_to_d optimizes the 8 to 16-bit conversion.
*/
static double sRGB_to_d[256];
static double g22_to_d[256];
@@ -235,7 +235,7 @@ power_law_error16(int value)
if (value > 0 && value < 65535)
{
/* Round trip the value through an 8-bit representation but using
* non-matching to/from convertions.
* non-matching to/from conversions.
*/
double vd = value / 65535.;
double e = fabs(
@@ -1066,7 +1066,7 @@ get_pixel(png_uint_32 format))(Pixel *p, png_const_voidp pb)
* 3) Convert between 8-bit and 16-bit components. (Both directtions are
* relevant.)
*
* This gives the following base format convertion matrix:
* This gives the following base format conversion matrix:
*
* OUT: ----- 8-bit ----- ----- 16-bit -----
* IN G GA RGB RGBA G GA RGB RGBA
@@ -1160,7 +1160,7 @@ gpc_nop6(Pixel *out, const Pixel *in, const Background *back)
}
#endif
/* 8-bit to 8-bit convertions */
/* 8-bit to 8-bit conversions */
/* bckg: composite on gray background */
static void
gpc_bckg(Pixel *out, const Pixel *in, const Background *back)
@@ -1255,7 +1255,7 @@ gpc_g8b(Pixel *out, const Pixel *in, const Background *back)
out->a = 255;
}
/* 8-bit to 16-bit convertions */
/* 8-bit to 16-bit conversions */
/* lin: make sRGB components linear, alpha := 65535 */
static void
gpc_lin(Pixel *out, const Pixel *in, const Background *back)
@@ -1412,7 +1412,7 @@ gpc_gprq(Pixel *out, const Pixel *in, const Background *back)
out->a = 65535;
}
/* 8-bit to 16-bit convertions for gAMA 45455 encoded values */
/* 8-bit to 16-bit conversions for gAMA 45455 encoded values */
/* Lin: make gAMA 45455 components linear, alpha := 65535 */
static void
gpc_Lin(Pixel *out, const Pixel *in, const Background *back)
@@ -1583,7 +1583,7 @@ gpc_Gprq(Pixel *out, const Pixel *in, const Background *back)
}
#endif
/* 16-bit to 8-bit convertions */
/* 16-bit to 8-bit conversions */
/* sRGB: convert linear components to sRGB, alpha := 255 */
static void
gpc_sRGB(Pixel *out, const Pixel *in, const Background *back)
@@ -1809,7 +1809,7 @@ gpc_cb16(Pixel *out, const Pixel *in, const Background *back)
out->a = 255;
}
/* 16-bit to 16-bit convertions */
/* 16-bit to 16-bit conversions */
/* A: set alpha to 65535 */
static void
gpc_A(Pixel *out, const Pixel *in, const Background *back)
@@ -1900,13 +1900,13 @@ static void (* const gpc_fn_colormapped[8/*in*/][8/*out*/])
};
/* The error arrays record the error in the same matrix; 64 entries, however
* the different algorithms used in libpng for colormap and direct convertions
* the different algorithms used in libpng for colormap and direct conversions
* mean that four separate matrices are used (for each combination of
* colormapped and direct.)
*
* In some cases the convertion between sRGB formats goes via a linear
* intermediate; an sRGB to linear convertion (as above) is followed by a simple
* linear to sRGB step with no other convertions. This is done by a separate
* In some cases the conversion between sRGB formats goes via a linear
* intermediate; an sRGB to linear conversion (as above) is followed by a simple
* linear to sRGB step with no other conversions. This is done by a separate
* error array from an arbitrary 'in' format to one of the four basic outputs
* (since final output is always sRGB not colormapped).
*
@@ -2120,7 +2120,7 @@ typedef struct
}
Transform;
/* Return a 'transform' as above for the given format convertion. */
/* Return a 'transform' as above for the given format conversion. */
static void
transform_from_formats(Transform *result, Image *in_image,
const Image *out_image, png_const_colorp background, int via_linear)
@@ -2185,10 +2185,10 @@ transform_from_formats(Transform *result, Image *in_image,
else
{
/* The caller handles the colormap->pixel value convertion, so the
/* The caller handles the colormap->pixel value conversion, so the
* transform function just gets a pixel value, however because libpng
* currently contains a different implementation for mapping a colormap if
* both input and output are colormapped we need different convertion
* both input and output are colormapped we need different conversion
* functions to deal with errors in the libpng implementation.
*/
if (in_format & out_format & PNG_FORMAT_FLAG_COLORMAP)
@@ -2249,7 +2249,7 @@ transform_from_formats(Transform *result, Image *in_image,
result->background_color.ir = background->red;
result->background_color.ig = background->green;
result->background_color.ib = background->blue;
/* TODO: sometimes libpng uses the power law convertion here, how
/* TODO: sometimes libpng uses the power law conversion here, how
* to handle this?
*/
result->background_color.dr = sRGB_to_d[background->red];
@@ -2262,7 +2262,7 @@ transform_from_formats(Transform *result, Image *in_image,
result->background_color.ir =
result->background_color.ig =
result->background_color.ib = background->green;
/* TODO: sometimes libpng uses the power law convertion here, how
/* TODO: sometimes libpng uses the power law conversion here, how
* to handle this?
*/
result->background_color.dr =
@@ -2276,7 +2276,7 @@ transform_from_formats(Transform *result, Image *in_image,
result->background_color.ir =
result->background_color.ig =
result->background_color.ib = BUFFER_INIT8;
/* TODO: sometimes libpng uses the power law convertion here, how
/* TODO: sometimes libpng uses the power law conversion here, how
* to handle this?
*/
result->background_color.dr =