Move DM png code to picture_utils, for use by other tools.
Planning to re-use this code in skiaserve in an upcoming change.
TBR=mtklein@google.com
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1901113002
Review URL: https://codereview.chromium.org/1901113002
diff --git a/tools/picture_utils.h b/tools/picture_utils.h
index 1373020..49a2c82 100644
--- a/tools/picture_utils.h
+++ b/tools/picture_utils.h
@@ -8,7 +8,9 @@
#ifndef picture_utils_DEFINED
#define picture_utils_DEFINED
-class SkBitmap;
+#include "SkBitmap.h"
+
+class SkData;
class SkString;
namespace sk_tools {
@@ -47,6 +49,12 @@
bool write_bitmap_to_disk(const SkBitmap& bm, const SkString& dirPath,
const char *subdirOrNull, const SkString& baseName);
+ // Return raw unpremultiplied RGBA bytes, suitable for storing in a PNG. The output
+ // colors are assumed to be sRGB values. This is only guaranteed to work for the
+ // cases that are currently emitted by tools:
+ // Linear premul 8888, sRGB premul 8888, Linear premul F16
+ sk_sp<SkData> encode_bitmap_for_png(SkBitmap bitmap);
+
} // namespace sk_tools
#endif // picture_utils_DEFINED