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-rw-r--r--cqrlogo.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/cqrlogo.c b/cqrlogo.c
index 9ebad37..a72fd2b 100644
--- a/cqrlogo.c
+++ b/cqrlogo.c
@@ -61,8 +61,13 @@ int generate_png (struct bitmap_t *bitmap, const char *uri) {
png_set_IHDR (png_ptr, info_ptr, bitmap->width, bitmap->height, 1 /* depth */,
PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
+ /* use best compression */
png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
+ /* use compression strategy filtered
+ * this way pngcrush can not optimize any more */
+ png_set_compression_strategy(png_ptr, Z_FILTERED);
+
#if defined PNG_TEXT_SUPPORTED && PNG_ENABLE_TEXT
unsigned int textcount = 0;
png_text *pngtext = NULL;