gdiplus: Added GpGraphics save/restore tests.

dlls/gdiplus/tests/graphics.c

@@ -24,6 +24,7 @@
 #include "wine/test.h"
 
 #define expect(expected, got) ok(got == expected, "Expected %.8x, got %.8x\n", expected, got)
+#define TABLE_LEN (23)
 
 static void test_constructor_destructor()
 {
@@ -51,6 +52,174 @@ static void test_constructor_destructor()
     ReleaseDC(0, hdc);
 }
 
+typedef struct node{
+    GraphicsState data;
+    struct node * next;
+} node;
+
+/* Linked list prepend function. */
+static void log_state(GraphicsState data, node ** log)
+{
+    node * new_entry = HeapAlloc(GetProcessHeap(), 0, sizeof(node));
+
+    new_entry->data = data;
+    new_entry->next = *log;
+    *log = new_entry;
+}
+
+/* Checks if there are duplicates in the list, and frees it. */
+static void check_no_duplicates(node * log)
+{
+    INT dups = 0;
+    node * temp = NULL;
+
+    if(!log)
+        goto end;
+
+    do{
+        HeapFree(GetProcessHeap(), 0, temp);
+        temp = log;
+        while((temp = temp->next))
+            if(log->data == temp->data)
+                dups++;
+
+    }while((log = log->next));
+
+    HeapFree(GetProcessHeap(), 0, temp);
+
+end:
+    expect(0, dups);
+}
+
+static void test_save_restore()
+{
+    GpStatus stat;
+    GraphicsState state_a, state_b, state_c;
+    InterpolationMode mode;
+    GpGraphics *graphics1, *graphics2;
+    node * state_log = NULL;
+    HDC hdc = GetDC(0);
+
+    /* Invalid saving. */
+    GdipCreateFromHDC(hdc, &graphics1);
+    stat = GdipSaveGraphics(graphics1, NULL);
+    expect(InvalidParameter, stat);
+    stat = GdipSaveGraphics(NULL, &state_a);
+    expect(InvalidParameter, stat);
+    GdipDeleteGraphics(graphics1);
+
+    log_state(state_a, &state_log);
+
+    /* Basic save/restore. */
+    GdipCreateFromHDC(hdc, &graphics1);
+    GdipSetInterpolationMode(graphics1, InterpolationModeBilinear);
+    stat = GdipSaveGraphics(graphics1, &state_a);
+    todo_wine
+        expect(Ok, stat);
+    GdipSetInterpolationMode(graphics1, InterpolationModeBicubic);
+    stat = GdipRestoreGraphics(graphics1, state_a);
+    todo_wine
+        expect(Ok, stat);
+    GdipGetInterpolationMode(graphics1, &mode);
+    todo_wine
+        expect(InterpolationModeBilinear, mode);
+    GdipDeleteGraphics(graphics1);
+
+    log_state(state_a, &state_log);
+
+    /* Restoring garbage doesn't affect saves. */
+    GdipCreateFromHDC(hdc, &graphics1);
+    GdipSetInterpolationMode(graphics1, InterpolationModeBilinear);
+    GdipSaveGraphics(graphics1, &state_a);
+    GdipSetInterpolationMode(graphics1, InterpolationModeBicubic);
+    GdipSaveGraphics(graphics1, &state_b);
+    GdipSetInterpolationMode(graphics1, InterpolationModeNearestNeighbor);
+    stat = GdipRestoreGraphics(graphics1, 0xdeadbeef);
+    todo_wine
+        expect(Ok, stat);
+    GdipRestoreGraphics(graphics1, state_b);
+    GdipGetInterpolationMode(graphics1, &mode);
+    todo_wine
+        expect(InterpolationModeBicubic, mode);
+    GdipRestoreGraphics(graphics1, state_a);
+    GdipGetInterpolationMode(graphics1, &mode);
+    todo_wine
+        expect(InterpolationModeBilinear, mode);
+    GdipDeleteGraphics(graphics1);
+
+    log_state(state_a, &state_log);
+    log_state(state_b, &state_log);
+
+    /* Restoring older state invalidates newer saves (but not older saves). */
+    GdipCreateFromHDC(hdc, &graphics1);
+    GdipSetInterpolationMode(graphics1, InterpolationModeBilinear);
+    GdipSaveGraphics(graphics1, &state_a);
+    GdipSetInterpolationMode(graphics1, InterpolationModeBicubic);
+    GdipSaveGraphics(graphics1, &state_b);
+    GdipSetInterpolationMode(graphics1, InterpolationModeNearestNeighbor);
+    GdipSaveGraphics(graphics1, &state_c);
+    GdipSetInterpolationMode(graphics1, InterpolationModeHighQualityBilinear);
+    GdipRestoreGraphics(graphics1, state_b);
+    GdipGetInterpolationMode(graphics1, &mode);
+    todo_wine
+        expect(InterpolationModeBicubic, mode);
+    GdipRestoreGraphics(graphics1, state_c);
+    GdipGetInterpolationMode(graphics1, &mode);
+    todo_wine
+        expect(InterpolationModeBicubic, mode);
+    GdipRestoreGraphics(graphics1, state_a);
+    GdipGetInterpolationMode(graphics1, &mode);
+    todo_wine
+        expect(InterpolationModeBilinear, mode);
+    GdipDeleteGraphics(graphics1);
+
+    log_state(state_a, &state_log);
+    log_state(state_b, &state_log);
+    log_state(state_c, &state_log);
+
+    /* Restoring older save from one graphics object does not invalidate
+     * newer save from other graphics object. */
+    GdipCreateFromHDC(hdc, &graphics1);
+    GdipCreateFromHDC(hdc, &graphics2);
+    GdipSetInterpolationMode(graphics1, InterpolationModeBilinear);
+    GdipSaveGraphics(graphics1, &state_a);
+    GdipSetInterpolationMode(graphics2, InterpolationModeBicubic);
+    GdipSaveGraphics(graphics2, &state_b);
+    GdipSetInterpolationMode(graphics1, InterpolationModeNearestNeighbor);
+    GdipSetInterpolationMode(graphics2, InterpolationModeNearestNeighbor);
+    GdipRestoreGraphics(graphics1, state_a);
+    GdipGetInterpolationMode(graphics1, &mode);
+    todo_wine
+        expect(InterpolationModeBilinear, mode);
+    GdipRestoreGraphics(graphics2, state_b);
+    GdipGetInterpolationMode(graphics2, &mode);
+    todo_wine
+        expect(InterpolationModeBicubic, mode);
+    GdipDeleteGraphics(graphics1);
+    GdipDeleteGraphics(graphics2);
+
+    /* You can't restore a state to a graphics object that didn't save it. */
+    GdipCreateFromHDC(hdc, &graphics1);
+    GdipCreateFromHDC(hdc, &graphics2);
+    GdipSetInterpolationMode(graphics1, InterpolationModeBilinear);
+    GdipSaveGraphics(graphics1, &state_a);
+    GdipSetInterpolationMode(graphics1, InterpolationModeNearestNeighbor);
+    GdipSetInterpolationMode(graphics2, InterpolationModeNearestNeighbor);
+    GdipRestoreGraphics(graphics2, state_a);
+    GdipGetInterpolationMode(graphics2, &mode);
+    expect(InterpolationModeNearestNeighbor, mode);
+    GdipDeleteGraphics(graphics1);
+    GdipDeleteGraphics(graphics2);
+
+    log_state(state_a, &state_log);
+
+    /* The same state value should never be returned twice. */
+    todo_wine
+        check_no_duplicates(state_log);
+
+    ReleaseDC(0, hdc);
+}
+
 START_TEST(graphics)
 {
     struct GdiplusStartupInput gdiplusStartupInput;
@@ -64,6 +233,7 @@ START_TEST(graphics)
     GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
 
     test_constructor_destructor();
+    test_save_restore();
 
     GdiplusShutdown(gdiplusToken);
 }