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[master] Reenabled png_set_dither() but renamed it to png_set_quantize() to

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reflect more accurately what it actually does.  At the same time, renamed
the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros to
PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS.
This commit is contained in:
Glenn Randers-Pehrson
2010-04-16 07:24:52 -05:00
parent 7aad4e7fb4
commit 8dc3729522
11 changed files with 270 additions and 162 deletions
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15
example.c
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@@ -160,7 +160,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
* If you have enough memory to read in the entire image at once,
* and you need to specify only transforms that can be controlled
* with one of the PNG_TRANSFORM_* bits (this presently excludes
* dithering, filling, setting background, and doing gamma
* quantizing, filling, setting background, and doing gamma
* adjustment), then you can read the entire image (including
* pixels) into the info structure with this call:
*/
@@ -271,8 +271,8 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
png_set_gamma(png_ptr, screen_gamma, 0.45455);
}
#ifdef PNG_READ_DITHER_SUPPORTED
/* Dither RGB files down to 8 bit palette or reduce palettes
#ifdef PNG_READ_QUANTIZE_SUPPORTED
/* Quantize RGB files down to 8 bit palette or reduce palettes
* to the number of colors available on your screen.
*/
if (color_type & PNG_COLOR_MASK_COLOR)
@@ -283,10 +283,11 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
/* This reduces the image to the application supplied palette */
if (/* We have our own palette */)
{
/* An array of colors to which the image should be dithered */
/* An array of colors to which the image should be quantized */
png_color std_color_cube[MAX_SCREEN_COLORS];
png_set_dither(png_ptr, std_color_cube, MAX_SCREEN_COLORS,
/* Prior to libpng-1.4.2, this was png_set_dither(). */
png_set_quantize(png_ptr, std_color_cube, MAX_SCREEN_COLORS,
MAX_SCREEN_COLORS, NULL, 0);
}
/* This reduces the image to the palette supplied in the file */
@@ -296,11 +297,11 @@ void read_png(FILE *fp, unsigned int sig_read) /* File is already open */
png_get_hIST(png_ptr, info_ptr, &histogram);
png_set_dither(png_ptr, palette, num_palette,
png_set_quantize(png_ptr, palette, num_palette,
max_screen_colors, histogram, 0);
}
}
#endif /* PNG_READ_DITHER_SUPPORTED */
#endif /* PNG_READ_QUANTIZE_SUPPORTED */
/* Invert monochrome files to have 0 as white and 1 as black */
png_set_invert_mono(png_ptr);