Support export pdf with scene cover

src/main/java/com/bomostory/sceneeditmodule/PdfMaker.kt

@@ -15,10 +15,15 @@ object PdfMaker {
             val width = 1920
             val height = 1080
             val coverWidth = width / 2
+            val coverFile = project.coverFile
             emitter.onNext(progress++ / total)
             val name = project.name ?: ""
             val author = project.author ?: ""
-            val front = CoverDrawer.drawFrontCover(coverWidth, height, name, author, project.frontCoverColor.getColor(context))
+            val front = if (coverFile == null) {
+                CoverDrawer.drawFrontCover(width, height, name, author, project.frontCoverColor.getColor(context))
+            } else {
+                CoverDrawer.drawFrontCover(width, height, name, author, coverFile)
+            }
             emitter.onNext(progress++ / total)
             val back = CoverDrawer.drawBackCover(context, coverWidth, height, project.backCoverColor.getColor(context))
             emitter.onNext(progress++ / total)
@@ -41,9 +46,14 @@ object PdfMaker {
             val height = 1080
             val name = project.name ?: ""
             val author = project.author ?: ""
+            val coverFile = project.coverFile
             emitter.onNext(progress++ / total)
             /** front **/
-            val front = CoverDrawer.drawFrontCover(width, height, name, author, project.frontCoverColor.getColor(context))
+            val front = if (coverFile == null) {
+                CoverDrawer.drawFrontCover(width, height, name, author, project.frontCoverColor.getColor(context))
+            } else {
+                CoverDrawer.drawFrontCover(width, height, name, author, coverFile)
+            }
             emitter.onNext(progress++ / total)
             /** back **/
             val back = CoverDrawer.drawBackCover(context, width, height, project.backCoverColor.getColor(context))