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add support for encoding Index8 bitmaps into png

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git-svn-id: http://skia.googlecode.com/svn/trunk@254 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@android.com 2009-07-07 19:38:01 +00:00
parent 3d06a8c38d
commit 6189877c50
1 changed files with 11 additions and 10 deletions
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21
src/images/SkImageDecoder_libpng.cpp
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@ -768,16 +768,17 @@ bool SkPNGImageEncoder::onEncode(SkWStream* stream, const SkBitmap& bitmap,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
PNG_FILTER_TYPE_BASE);
#if 0 // need to support this some day
/* set the palette if there is one. REQUIRED for indexed-color images */
palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH
* png_sizeof (png_color));
/* ... set palette colors ... */
png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
/* You must not free palette here, because png_set_PLTE only makes a link to
the palette that you malloced. Wait until you are about to destroy
the png structure. */
#endif
// set our colortable/trans arrays if needed
png_color paletteColors[256];
png_byte trans[256];
if (SkBitmap::kIndex8_Config == config) {
SkColorTable* ct = bitmap.getColorTable();
int numTrans = pack_palette(ct, paletteColors, trans, hasAlpha);
png_set_PLTE(png_ptr, info_ptr, paletteColors, ct->count());
if (numTrans > 0) {
png_set_tRNS(png_ptr, info_ptr, trans, numTrans, NULL);
}
}
png_set_sBIT(png_ptr, info_ptr, &sig_bit);
png_write_info(png_ptr, info_ptr);