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More test cases for gradients with alpha channel 

* Swapping the opaque and transparent ends leads to different results,
* Linear gradients are also affected.
This commit is contained in:
Adrien Destugues 2014-07-23 17:59:37 +02:00
parent 5f6a39cabe
commit d1a5f90981
1 changed files with 32 additions and 3 deletions
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35
src/tests/servers/app/gradients/main.cpp
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@ -12,6 +12,7 @@
#include <string.h>
#include <Application.h>
#include <GradientLinear.h>
#include <GradientRadial.h>
#include <LayoutBuilder.h>
#include <List.h>
@ -79,13 +80,41 @@ public:
virtual void Draw(BView* view, BRect updateRect)
{
view->SetDrawingMode(B_OP_ALPHA);
// These draw as almost transparent
// Radial gradient
BPoint center(50, 50);
float radius = 50.0;
BGradientRadial g(center, radius);
g.AddColor((rgb_color){ 0, 0, 0, 255 }, 0.0);
g.AddColor((rgb_color){ 0, 0, 0, 0 }, 255.0);
view->SetDrawingMode(B_OP_ALPHA);
g.AddColor((rgb_color){ 255, 0, 0, 255 }, 0.0);
g.AddColor((rgb_color){ 0, 255, 0, 0 }, 255.0);
view->FillEllipse(center, radius, radius, g);
// Linear gradient
BPoint from(100, 0);
BPoint to(200, 0);
BGradientLinear l(from, to);
l.AddColor((rgb_color){ 255, 0, 0, 0 }, 0.0);
l.AddColor((rgb_color){ 0, 255, 0, 255 }, 255.0);
view->FillRect(BRect(100, 0, 200, 100), l);
// These draw as opaque or almost opaque
view->SetOrigin(BPoint(0, 100));
// Radial gradient
BGradientRadial go(center, radius);
go.AddColor((rgb_color){ 255, 0, 0, 0 }, 0.0);
go.AddColor((rgb_color){ 0, 255, 0, 255 }, 255.0);
view->FillEllipse(center, radius, radius, go);
// Linear gradient
BGradientLinear lo(from, to);
lo.AddColor((rgb_color){ 255, 0, 0, 255 }, 0.0);
lo.AddColor((rgb_color){ 0, 255, 0, 0 }, 255.0);
view->FillRect(BRect(100, 0, 200, 100), lo);
}
};