+ new graph unit test DrawTest for PutPixel, GetPixel, HLine, VLine and write modes

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@16003 3ad0048d-3df7-0310-abae-a5850022a9f2

1 files changed, 197 insertions, 0 deletions

diff --git a/packages/graph/tests/drawtest.pas b/packages/graph/tests/drawtest.pas
new file mode 100644
index 0000000000..b7d168abc1
--- /dev/null
+++ b/packages/graph/tests/drawtest.pas
@@ -0,0 +1,197 @@
+{
+  Test for the basic graph operations - PutPixel, GetPixel and HLine/VLine
+  drawing with different colours and write modes
+
+  Test draws random pixels and H/V lines with the graph unit and performs the
+  same operations in memory. Finally it reads the whole resulting image, pixel
+  by pixel, via GetPixel and compares the result with the expected value from
+  the PixArray
+
+  Useful for testing the platform-specific parts of the FPC graph unit (in
+  various modes and operating systems)
+
+  This test works also with TP7
+}
+
+program DrawTest;
+
+uses
+  Graph;
+
+type
+  TTestParams = record
+    Driver: Integer;
+    Mode: Integer;
+    NumberOfObjectsToDraw: Integer;
+    ProbabilityPixel: Integer;
+    ProbabilityHLine: Integer;
+    ProbabilityVLine: Integer;
+  end;
+
+  TPixelColor = Word;
+  PRow = ^TRow;
+  TRow = array [0..1279] of TPixelColor;
+
+var
+  XRes, YRes: Integer;
+  PixArray: array [0..1023] of PRow;
+
+procedure InitPixArray(AXRes, AYRes: Integer);
+var
+  Y: Integer;
+begin
+  XRes := AXRes;
+  YRes := AYRes;
+  for Y := 0 to AYRes - 1 do
+  begin
+    GetMem(PixArray[Y], AXRes * SizeOf(TPixelColor));
+    FillChar(PixArray[Y]^, AXRes * SizeOf(TPixelColor), 0);
+  end;
+end;
+
+procedure TestFinalResult;
+var
+  X, Y: Integer;
+begin
+  for Y := 0 to YRes - 1 do
+    for X := 0 to XRes - 1 do
+      if GetPixel(X, Y) <> PixArray[Y]^[X] then
+      begin
+        CloseGraph;
+        Writeln('Error at X = ', X, ', Y = ', Y);
+        Halt(1);
+      end;
+end;
+
+procedure TestPutPixel(X, Y: Integer; Color: TPixelColor);
+begin
+  PutPixel(X, Y, Color);
+
+  PixArray[Y]^[X] := Color;
+end;
+
+procedure DirectPutPixel(X, Y: Integer; Color: TPixelColor; WriteMode: Integer);
+begin
+  case WriteMode of
+    NormalPut, OrPut, NotPut: PixArray[Y]^[X] := Color;
+    XORPut, AndPut: PixArray[Y]^[X] := PixArray[Y]^[X] xor Color;
+
+    { TODO: add some sort of SetWriteModeExtended to the FPC graph unit, so
+      we can test these as well: }
+{    OrPut: PixArray[Y]^[X] := PixArray[Y]^[X] or Color;}
+{    AndPut: PixArray[Y]^[X] := PixArray[Y]^[X] and Color;}
+{    NotPut: PixArray[Y]^[X] := Color xor GetMaxColor;}
+  end;
+end;
+
+procedure TestHLine(Y, X1, X2: Integer; Color: TPixelColor; WriteMode: Integer);
+var
+  tmp, X: Integer;
+begin
+  SetWriteMode(WriteMode);
+  SetColor(Color);
+  Line(X1, Y, X2, Y);
+
+  if X1 > X2 then
+  begin
+    tmp := X1;
+    X1 := X2;
+    X2 := tmp;
+  end;
+
+  for X := X1 to X2 do
+  begin
+    DirectPutPixel(X, Y, Color, WriteMode);
+  end;
+
+  SetWriteMode(NormalPut);
+end;
+
+procedure TestVLine(X, Y1, Y2: Integer; Color: TPixelColor; WriteMode: Integer);
+var
+  tmp, Y: Integer;
+begin
+  SetWriteMode(WriteMode);
+  SetColor(Color);
+  Line(X, Y1, X, Y2);
+
+  if Y1 > Y2 then
+  begin
+    tmp := Y1;
+    Y1 := Y2;
+    Y2 := tmp;
+  end;
+
+  for Y := Y1 to Y2 do
+  begin
+    DirectPutPixel(X, Y, Color, WriteMode);
+  end;
+
+  SetWriteMode(NormalPut);
+end;
+
+procedure TestDraw(const TestParams: TTestParams);
+var
+  I: Integer;
+  R: Integer;
+begin
+  for I := 1 to TestParams.NumberOfObjectsToDraw do
+  begin
+    R := Random(TestParams.ProbabilityPixel + TestParams.ProbabilityHLine + TestParams.ProbabilityVLine);
+    if R < TestParams.ProbabilityPixel then
+      TestPutPixel(Random(XRes), Random(YRes), Random(GetMaxColor + 1))
+    else
+      if (R >= TestParams.ProbabilityPixel) and (R < TestParams.ProbabilityPixel + TestParams.ProbabilityHLine) then
+        TestHLine(Random(YRes), Random(XRes), Random(XRes), Random(GetMaxColor + 1), Random(NotPut + 1))
+      else
+        TestVLine(Random(XRes), Random(YRes), Random(YRes), Random(GetMaxColor + 1), Random(NotPut + 1));
+  end;
+end;
+
+procedure PerformTest(const TestParams: TTestParams);
+var
+  GraphDriver, GraphMode: Integer;
+begin
+  GraphDriver := TestParams.Driver;
+  GraphMode := TestParams.Mode;
+  InitGraph(GraphDriver, GraphMode, 'C:\TP\BGI');
+
+  InitPixArray(GetMaxX + 1, GetMaxY + 1);
+
+  TestDraw(TestParams);
+
+  TestFinalResult;
+
+  CloseGraph;
+  Writeln('Ok');
+end;
+
+var
+  TestsCount: Integer;
+  TestParams: TTestParams;
+  Code: Integer;
+  I: Integer;
+begin
+  if ParamCount <> 3 then
+  begin
+    Writeln('Usage: ', ParamStr(0), ' <driver number> <mode number> <tests count>');
+    Writeln;
+    Writeln('For example: ', ParamStr(0), ' 9 2 20');
+    Writeln('performs 20 tests in 640x480x16 VGA mode (VGA = 9, VGAHi = 2)');
+    Halt;
+  end;
+  Val(ParamStr(1), TestParams.Driver, Code);
+  Val(ParamStr(2), TestParams.Mode, Code);
+  Val(ParamStr(3), TestsCount, Code);
+
+  Randomize;
+
+  for I := 1 to TestsCount do
+  begin
+    TestParams.NumberOfObjectsToDraw := Random(30000);
+    TestParams.ProbabilityPixel := Random(10);
+    TestParams.ProbabilityHLine := Random(2);
+    TestParams.ProbabilityVLine := Random(2);
+    PerformTest(TestParams);
+  end;
+end.