void MWinDeviceImpl::ClipRect(
MRect inRect)
{
if (mClipLayer != nil)
{
mRenderTarget->PopLayer();
mClipLayer->Release();
}
THROW_IF_HRESULT_ERROR(mRenderTarget->CreateLayer(&mClipLayer));
// Push the layer with the geometric mask.
mRenderTarget->PushLayer(
D2D1::LayerParameters(D2D1::RectF(inRect.x, inRect.y,
inRect.x + inRect.width, inRect.y + inRect.height)),
mClipLayer);
}
// this interesting approach comes from http://blogs.msdn.com/b/wpfsdk/archive/2006/10/26/uncommon-dialogs--font-chooser-and-color-picker-dialogs.aspx
static void drawSVChooser(struct colorDialog *c, ID2D1RenderTarget *rt)
{
D2D1_SIZE_F size;
D2D1_RECT_F rect;
double rTop, gTop, bTop;
D2D1_GRADIENT_STOP stops[2];
ID2D1GradientStopCollection *collection;
D2D1_LINEAR_GRADIENT_BRUSH_PROPERTIES lprop;
D2D1_BRUSH_PROPERTIES bprop;
ID2D1LinearGradientBrush *brush;
ID2D1LinearGradientBrush *opacity;
ID2D1Layer *layer;
D2D1_LAYER_PARAMETERS layerparams;
D2D1_ELLIPSE mparam;
D2D1_COLOR_F mcolor;
ID2D1SolidColorBrush *markerBrush;
HRESULT hr;
size = realGetSize(rt);
rect.left = 0;
rect.top = 0;
rect.right = size.width;
rect.bottom = size.height;
drawGrid(rt, &rect);
// first, draw a vertical gradient from the current hue at max S/V to black
// the source example draws it upside down; let's do so too just to be safe
hsv2RGB(c->h, 1.0, 1.0, &rTop, &gTop, &bTop);
stops[0].position = 0;
stops[0].color.r = 0.0;
stops[0].color.g = 0.0;
stops[0].color.b = 0.0;
stops[0].color.a = 1.0;
stops[1].position = 1;
stops[1].color.r = rTop;
stops[1].color.g = gTop;
stops[1].color.b = bTop;
stops[1].color.a = 1.0;
hr = rt->CreateGradientStopCollection(stops, 2,
D2D1_GAMMA_2_2, D2D1_EXTEND_MODE_CLAMP,
&collection);
if (hr != S_OK)
logHRESULT(L"error making gradient stop collection for first gradient in SV chooser", hr);
ZeroMemory(&lprop, sizeof (D2D1_LINEAR_GRADIENT_BRUSH_PROPERTIES));
lprop.startPoint.x = size.width / 2;
lprop.startPoint.y = size.height;
lprop.endPoint.x = size.width / 2;
lprop.endPoint.y = 0;
// TODO decide what to do about the duplication of this
ZeroMemory(&bprop, sizeof (D2D1_BRUSH_PROPERTIES));
bprop.opacity = c->a; // note this part; we also use it below for the layer
bprop.transform._11 = 1;
bprop.transform._22 = 1;
hr = rt->CreateLinearGradientBrush(&lprop, &bprop,
collection, &brush);
if (hr != S_OK)
logHRESULT(L"error making gradient brush for first gradient in SV chooser", hr);
rt->FillRectangle(&rect, brush);
brush->Release();
collection->Release();
// second, create an opacity mask for the third step: a horizontal gradientthat goes from opaque to translucent
stops[0].position = 0;
stops[0].color.r = 0.0;
stops[0].color.g = 0.0;
stops[0].color.b = 0.0;
stops[0].color.a = 1.0;
stops[1].position = 1;
stops[1].color.r = 0.0;
stops[1].color.g = 0.0;
stops[1].color.b = 0.0;
stops[1].color.a = 0.0;
hr = rt->CreateGradientStopCollection(stops, 2,
D2D1_GAMMA_2_2, D2D1_EXTEND_MODE_CLAMP,
&collection);
if (hr != S_OK)
logHRESULT(L"error making gradient stop collection for opacity mask gradient in SV chooser", hr);
ZeroMemory(&lprop, sizeof (D2D1_LINEAR_GRADIENT_BRUSH_PROPERTIES));
lprop.startPoint.x = 0;
lprop.startPoint.y = size.height / 2;
lprop.endPoint.x = size.width;
lprop.endPoint.y = size.height / 2;
ZeroMemory(&bprop, sizeof (D2D1_BRUSH_PROPERTIES));
bprop.opacity = 1.0;
bprop.transform._11 = 1;
bprop.transform._22 = 1;
hr = rt->CreateLinearGradientBrush(&lprop, &bprop,
collection, &opacity);
if (hr != S_OK)
logHRESULT(L"error making gradient brush for opacity mask gradient in SV chooser", hr);
collection->Release();
// finally, make a vertical gradient from white at the top to black at the bottom (right side up this time) and with the previous opacity mask
stops[0].position = 0;
stops[0].color.r = 1.0;
stops[0].color.g = 1.0;
stops[0].color.b = 1.0;
stops[0].color.a = 1.0;
stops[1].position = 1;
stops[1].color.r = 0.0;
stops[1].color.g = 0.0;
stops[1].color.b = 0.0;
stops[1].color.a = 1.0;
hr = rt->CreateGradientStopCollection(stops, 2,
D2D1_GAMMA_2_2, D2D1_EXTEND_MODE_CLAMP,
&collection);
if (hr != S_OK)
logHRESULT(L"error making gradient stop collection for second gradient in SV chooser", hr);
ZeroMemory(&lprop, sizeof (D2D1_LINEAR_GRADIENT_BRUSH_PROPERTIES));
lprop.startPoint.x = size.width / 2;
lprop.startPoint.y = 0;
lprop.endPoint.x = size.width / 2;
lprop.endPoint.y = size.height;
ZeroMemory(&bprop, sizeof (D2D1_BRUSH_PROPERTIES));
bprop.opacity = 1.0;
bprop.transform._11 = 1;
bprop.transform._22 = 1;
hr = rt->CreateLinearGradientBrush(&lprop, &bprop,
collection, &brush);
if (hr != S_OK)
logHRESULT(L"error making gradient brush for second gradient in SV chooser", hr);
// oh but wait we can't use FillRectangle() with an opacity mask
// and we can't use FillGeometry() with both an opacity mask and a non-bitmap
// layers it is!
hr = rt->CreateLayer(&size, &layer);
if (hr != S_OK)
logHRESULT(L"error making layer for second gradient in SV chooser", hr);
ZeroMemory(&layerparams, sizeof (D2D1_LAYER_PARAMETERS));
layerparams.contentBounds = rect;
// TODO make sure these are right
layerparams.geometricMask = NULL;
layerparams.maskAntialiasMode = D2D1_ANTIALIAS_MODE_PER_PRIMITIVE;
layerparams.maskTransform._11 = 1;
layerparams.maskTransform._22 = 1;
layerparams.opacity = c->a; // here's the other use of c->a to note
layerparams.opacityBrush = opacity;
layerparams.layerOptions = D2D1_LAYER_OPTIONS_NONE;
rt->PushLayer(&layerparams, layer);
rt->FillRectangle(&rect, brush);
rt->PopLayer();
layer->Release();
brush->Release();
collection->Release();
opacity->Release();
// and now we just draw the marker
ZeroMemory(&mparam, sizeof (D2D1_ELLIPSE));
mparam.point.x = c->s * size.width;
mparam.point.y = (1 - c->v) * size.height;
mparam.radiusX = 7;
mparam.radiusY = 7;
// TODO make the color contrast?
mcolor.r = 1.0;
mcolor.g = 1.0;
mcolor.b = 1.0;
mcolor.a = 1.0;
bprop.opacity = 1.0; // the marker should always be opaque
hr = rt->CreateSolidColorBrush(&mcolor, &bprop, &markerBrush);
if (hr != S_OK)
logHRESULT(L"error creating brush for SV chooser marker", hr);
rt->DrawEllipse(&mparam, markerBrush, 2, NULL);
markerBrush->Release();
}
