use pdf L_FLATE_ENCODE only for png input; fixes #1961

zdenop · zdenop · commit f794571195b0 · 2018-10-07T20:57:19.000+02:00
diff --git a/src/api/pdfrenderer.cpp b/src/api/pdfrenderer.cpp
@@ -716,7 +716,8 @@ bool TessPDFRenderer::imageToPDFObj(Pix *pix,
   const int kJpegQuality = jpg_quality;
 
   int format, sad;
-  sad = pixGenerateCIData(pix, L_FLATE_ENCODE, 0, 0, &cid);
+  if (pixGetInputFormat(pix) == IFF_PNG)
+    sad = pixGenerateCIData(pix, L_FLATE_ENCODE, 0, 0, &cid);
   if (!cid) {
     sad = l_generateCIDataForPdf(filename, pix, kJpegQuality, &cid);
   }

Original file line number	Diff line number	Diff line change
`@@ -716,7 +716,8 @@ bool TessPDFRenderer::imageToPDFObj(Pix *pix,`
`716`	`716`	`const int kJpegQuality = jpg_quality;`
`717`	`717`
`718`	`718`	`int format, sad;`
`719`		`- sad = pixGenerateCIData(pix, L_FLATE_ENCODE, 0, 0, &cid);`
	`719`	`+ if (pixGetInputFormat(pix) == IFF_PNG)`
	`720`	`+ sad = pixGenerateCIData(pix, L_FLATE_ENCODE, 0, 0, &cid);`
`720`	`721`	`if (!cid) {`
`721`	`722`	`sad = l_generateCIDataForPdf(filename, pix, kJpegQuality, &cid);`
`722`	`723`	`}`