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Implemented linear gradients.

This commit is contained in:
Pietro Gagliardi 2015-10-07 16:54:56 -04:00
parent a4a37d1175
commit 1a4f585556
1 changed files with 62 additions and 4 deletions
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66
winarea_d2d/draw.c
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@ -286,11 +286,69 @@ static ID2D1Brush *makeSolidBrush(uiDrawBrush *b, ID2D1RenderTarget *rt, D2D1_BR
return (ID2D1Brush *) brush;
}
/* TODO
static ID2D1Brush *makeLinearBrush(uiDrawBrush *b, ID2D1RenderTarget *rt, D2D1_BRUSH_PROPERTIES *props)
static ID2D1GradientStopCollection *mkstops(uiDrawBrush *b, ID2D1RenderTarget *rt)
{
ID2D1GradientStopCollection *s;
D2D1_GRADIENT_STOP *stops;
size_t i;
HRESULT hr;
// TODO uiAlloc
stops = malloc(b->NumStops * sizeof (D2D1_GRADIENT_STOP));
for (i = 0; i < b->NumStops; i++) {
stops[i].position = b->Stops[i].Pos;
stops[i].color.r = b->Stops[i].R;
stops[i].color.g = b->Stops[i].G;
stops[i].color.b = b->Stops[i].B;
stops[i].color.a = b->Stops[i].A;
}
// TODO BUG IN MINGW
// the Microsoft headers give this all 6 parameters
// the MinGW headers use the 4-parameter version
hr = (*(rt->lpVtbl->CreateGradientStopCollection))(rt,
stops,
b->NumStops,
D2D1_GAMMA_2_2, // this is the default for the C++-only overload of ID2D1RenderTarget::GradientStopCollection()
D2D1_EXTEND_MODE_CLAMP,
&s);
if (hr != S_OK)
logHRESULT("error creating stop collection in mkstops()", hr);
// TODO uiFree
free(stops);
return s;
}
static ID2D1Brush *makeLinearBrush(uiDrawBrush *b, ID2D1RenderTarget *rt, D2D1_BRUSH_PROPERTIES *props)
{
ID2D1LinearGradientBrush *brush;
D2D1_LINEAR_GRADIENT_BRUSH_PROPERTIES gprops;
ID2D1GradientStopCollection *stops;
HRESULT hr;
ZeroMemory(&gprops, sizeof (D2D1_LINEAR_GRADIENT_BRUSH_PROPERTIES));
gprops.startPoint.x = b->X0;
gprops.startPoint.y = b->Y0;
gprops.endPoint.x = b->X1;
gprops.endPoint.y = b->Y1;
stops = mkstops(b, rt);
hr = ID2D1RenderTarget_CreateLinearGradientBrush(rt,
&gprops,
props,
stops,
&brush);
if (hr != S_OK)
logHRESULT("error creating gradient brush in makeLinearBrush()", hr);
// the example at https://msdn.microsoft.com/en-us/library/windows/desktop/dd756682%28v=vs.85%29.aspx says this is safe to do now
ID2D1GradientStopCollection_Release(stops);
return (ID2D1Brush *) brush;
}
/* TODO
static ID2D1Brush *makeRadialBrush(uiDrawBrush *b, ID2D1RenderTarget *rt, D2D1_BRUSH_PROPERTIES *props)
{
}
@ -309,8 +367,8 @@ static ID2D1Brush *makeBrush(uiDrawBrush *b, ID2D1RenderTarget *rt)
switch (b->Type) {
case uiDrawBrushTypeSolid:
return makeSolidBrush(b, rt, &props);
// case uiDrawBrushTypeLinearGradient:
// return makeLinearBrush(b, rt, &props);
case uiDrawBrushTypeLinearGradient:
return makeLinearBrush(b, rt, &props);
// case uiDrawBrushTypeRadialGradient:
// return makeRadialBrush(b, rt, &props);
// case uiDrawBrushTypeImage: