gdiplus: Implement writing Clear operation to metafiles.

dlls/gdiplus/gdiplus_private.h

@@ -86,6 +86,7 @@ extern GpStatus graphics_from_image(GpImage *image, GpGraphics **graphics) DECLS
 extern GpStatus METAFILE_GetGraphicsContext(GpMetafile* metafile, GpGraphics **result) DECLSPEC_HIDDEN;
 extern GpStatus METAFILE_GetDC(GpMetafile* metafile, HDC *hdc) DECLSPEC_HIDDEN;
 extern GpStatus METAFILE_ReleaseDC(GpMetafile* metafile, HDC hdc) DECLSPEC_HIDDEN;
+extern GpStatus METAFILE_GraphicsClear(GpMetafile* metafile, ARGB color) DECLSPEC_HIDDEN;
 extern GpStatus METAFILE_FillRectangles(GpMetafile* metafile, GpBrush* brush,
     GDIPCONST GpRectF* rects, INT count) DECLSPEC_HIDDEN;
 extern GpStatus METAFILE_SetPageTransform(GpMetafile* metafile, GpUnit unit, REAL scale) DECLSPEC_HIDDEN;

dlls/gdiplus/graphics.c

@@ -4379,6 +4379,9 @@ GpStatus WINGDIPAPI GdipGraphicsClear(GpGraphics *graphics, ARGB color)
     if(graphics->busy)
         return ObjectBusy;
 
+    if (graphics->image && graphics->image->type == ImageTypeMetafile)
+        return METAFILE_GraphicsClear((GpMetafile*)graphics->image, color);
+
     if((stat = GdipCreateSolidFill(color, &brush)) != Ok)
         return stat;
 

dlls/gdiplus/metafile.c

@@ -57,6 +57,12 @@ typedef struct EmfPlusHeader
     DWORD LogicalDpiY;
 } EmfPlusHeader;
 
+typedef struct EmfPlusClear
+{
+    EmfPlusRecordHeader Header;
+    DWORD Color;
+} EmfPlusClear;
+
 typedef struct EmfPlusFillRects
 {
     EmfPlusRecordHeader Header;
@@ -370,6 +376,27 @@ GpStatus METAFILE_GetDC(GpMetafile* metafile, HDC *hdc)
     return Ok;
 }
 
+GpStatus METAFILE_GraphicsClear(GpMetafile* metafile, ARGB color)
+{
+    if (metafile->metafile_type == MetafileTypeEmfPlusOnly || metafile->metafile_type == MetafileTypeEmfPlusDual)
+    {
+        EmfPlusClear *record;
+        GpStatus stat;
+
+        stat = METAFILE_AllocateRecord(metafile, sizeof(EmfPlusClear), (void**)&record);
+        if (stat != Ok)
+            return stat;
+
+        record->Header.Type = EmfPlusRecordTypeClear;
+        record->Header.Flags = 0;
+        record->Color = color;
+
+        METAFILE_WriteRecords(metafile);
+    }
+
+    return Ok;
+}
+
 static BOOL is_integer_rect(const GpRectF *rect)
 {
     SHORT x, y, width, height;

dlls/gdiplus/tests/metafile.c

@@ -862,6 +862,95 @@ static void test_fillrect(void)
     expect(Ok, stat);
 }
 
+static const emfplus_record clear_emf_records[] = {
+    {0, EMR_HEADER},
+    {0, EmfPlusRecordTypeHeader},
+    {0, EmfPlusRecordTypeClear},
+    {1, EMR_SAVEDC},
+    {1, EMR_SETICMMODE},
+    {1, EMR_BITBLT},
+    {1, EMR_RESTOREDC},
+    {0, EmfPlusRecordTypeEndOfFile},
+    {0, EMR_EOF},
+    {0}
+};
+
+static void test_clear(void)
+{
+    GpStatus stat;
+    GpMetafile *metafile;
+    GpGraphics *graphics;
+    HDC hdc;
+    HENHMETAFILE hemf;
+    static const GpRectF frame = {0.0, 0.0, 100.0, 100.0};
+    static const GpPointF dst_points[3] = {{10.0,10.0},{20.0,10.0},{10.0,20.0}};
+    static const WCHAR description[] = {'w','i','n','e','t','e','s','t',0};
+    GpBitmap *bitmap;
+    ARGB color;
+
+    hdc = CreateCompatibleDC(0);
+
+    stat = GdipRecordMetafile(hdc, EmfTypeEmfPlusOnly, &frame, MetafileFrameUnitPixel, description, &metafile);
+    expect(Ok, stat);
+
+    DeleteDC(hdc);
+
+    if (stat != Ok)
+        return;
+
+    stat = GdipGetHemfFromMetafile(metafile, &hemf);
+    expect(InvalidParameter, stat);
+
+    stat = GdipGetImageGraphicsContext((GpImage*)metafile, &graphics);
+    expect(Ok, stat);
+
+    stat = GdipGraphicsClear(graphics, 0xffffff00);
+    expect(Ok, stat);
+
+    stat = GdipDeleteGraphics(graphics);
+    expect(Ok, stat);
+
+    save_metafile(metafile, "clear.emf");
+
+    stat = GdipCreateBitmapFromScan0(30, 30, 0, PixelFormat32bppRGB, NULL, &bitmap);
+    expect(Ok, stat);
+
+    stat = GdipGetImageGraphicsContext((GpImage*)bitmap, &graphics);
+    expect(Ok, stat);
+
+    stat = GdipDrawImagePointsRect(graphics, (GpImage*)metafile, dst_points, 3,
+        0.0, 0.0, 100.0, 100.0, UnitPixel, NULL, NULL, NULL);
+    expect(Ok, stat);
+
+    stat = GdipBitmapGetPixel(bitmap, 5, 5, &color);
+    expect(Ok, stat);
+    expect(0xff000000, color);
+
+    stat = GdipBitmapGetPixel(bitmap, 15, 15, &color);
+    expect(Ok, stat);
+    todo_wine expect(0xffffff00, color);
+
+    stat = GdipBitmapGetPixel(bitmap, 25, 25, &color);
+    expect(Ok, stat);
+    expect(0xff000000, color);
+
+    stat = GdipDeleteGraphics(graphics);
+    expect(Ok, stat);
+
+    stat = GdipDisposeImage((GpImage*)bitmap);
+    expect(Ok, stat);
+
+    stat = GdipGetHemfFromMetafile(metafile, &hemf);
+    expect(Ok, stat);
+
+    stat = GdipDisposeImage((GpImage*)metafile);
+    expect(Ok, stat);
+
+    check_emfplus(hemf, clear_emf_records, "clear emf");
+
+    DeleteEnhMetaFile(hemf);
+}
+
 static void test_nullframerect(void) {
     GpStatus stat;
     GpMetafile *metafile;
@@ -1345,6 +1434,7 @@ START_TEST(metafile)
     test_getdc();
     test_emfonly();
     test_fillrect();
+    test_clear();
     test_nullframerect();
     test_pagetransform();
     test_converttoemfplus();