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Transparency fixed

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git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@1524 8092fc87-c524-0410-9efc-e669fe64eaf9
This commit is contained in:
avolkov
2005-02-08 22:31:55 +00:00
parent e470ed9ccd
commit 42324623c8
1 changed files with 9 additions and 4 deletions
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tools/ani/unani.c
+9 -4
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@@ -595,11 +595,16 @@ writePacked(const char *filename, const frame_desc *f,
sig_bit.blue = 8;
png_set_sBIT(png_ptr, info_ptr, &sig_bit);
png_set_PLTE(png_ptr, info_ptr, palettes[f->plut], 256);
if (transparentPixel >= 0) {
if (transparentPixel >= 0)
{ // generate transparency chunk
// for indexed PNGs, tRNS chunk contains an array of
// alpha values corresponding to palette entries
png_byte trans[256];
memset(trans, 0x0, 256 * sizeof (png_byte));
trans[transparentPixel] = 0xff;
png_set_tRNS(png_ptr, info_ptr, trans, 1, NULL);
// set all palette alpha values to 0xff (fully opaque) initially
memset(trans, 0xff, 256 * sizeof (png_byte));
trans[transparentPixel] = 0; // the only one
// only need to write out upto and including transparentPixel
png_set_tRNS(png_ptr, info_ptr, trans, transparentPixel + 1, NULL);
}
png_write_info(png_ptr, info_ptr);
png_write_image(png_ptr, (png_byte **) lines);