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Add 'iqd' parameter to enable configuring of Floyd-Steinberg dithering in libimagequant. Also, rename iq= to iqs=

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This commit is contained in:
Daniel Patterson 2015-05-14 21:36:34 -07:00
parent d9ba2d006e
commit c30bb11c8b
2 changed files with 15 additions and 3 deletions
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5
include/mapnik/png_io.hpp
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@ -58,6 +58,7 @@ struct png_options {
int strategy;
int trans_mode;
int iq_speed;
double iq_dither;
double gamma;
bool paletted;
quantization_type quantization;
@ -68,6 +69,7 @@ struct png_options {
strategy(Z_DEFAULT_STRATEGY),
trans_mode(-1),
iq_speed(3),
iq_dither(-1),
gamma(-1),
paletted(true),
quantization(HEXTREE),
@ -740,6 +742,9 @@ void save_as_png8_libimagequant(T1 & file,
liq_result *res = liq_quantize_image(attr, liq_image);
// Store palettized version
if (opts.iq_dither != -1) {
liq_set_dithering_level(res, opts.iq_dither);
}
image_gray8 reduced_image(width, height);
liq_write_remapped_image(res, liq_image, (void *)reduced_image.data(), width*height*sizeof(gray8_t));
const liq_palette *liq_pal = liq_get_palette(res);

13
src/image_util_png.cpp
View file

@ -91,11 +91,18 @@ void handle_png_options(std::string const& type,
opts.quantization = png_options::IMGQUANT;
}
else if (boost::algorithm::starts_with(t, "iq="))
else if (boost::algorithm::starts_with(t, "iqs="))
{
if (!mapnik::util::string2int(t.substr(3), opts.iq_speed) || opts.iq_speed < 1 || opts.iq_speed > 10)
if (!mapnik::util::string2int(t.substr(4), opts.iq_speed) || opts.iq_speed < 1 || opts.iq_speed > 10)
{
throw ImageWriterException("invalid iq speed parameter: " + t.substr(3));
throw ImageWriterException("invalid iq speed parameter: " + t.substr(4));
}
}
else if (boost::algorithm::starts_with(t, "iqd="))
{
if (!mapnik::util::string2double(t.substr(4), opts.iq_dither) || opts.iq_dither < 0 || opts.iq_dither > 1)
{
throw ImageWriterException("invalid iq dithering parameter: " + t.substr(4));
}
}
else if (t == "e=miniz")