void
TransparentRendererCache::CopyTransparentWhiteTo(Canvas &canvas,
const WindowProjection &projection) const
{
if (empty)
return;
canvas.CopyTransparentWhite(0, 0,
projection.GetScreenWidth(),
projection.GetScreenHeight(),
buffer, 0, 0);
}
/**
* Draw the final glide groundline (and shading) to the buffer
* and copy the transparent buffer to the canvas
* @param canvas The drawing canvas
* @param rc The area to draw in
* @param buffer The drawing buffer
*/
void
MapWindow::DrawTerrainAbove(Canvas &canvas)
{
// Don't draw at all if
// .. no GPS fix
// .. not flying
// .. feature disabled
// .. feature inaccessible
if (!Basic().location_available
|| !Calculated().flight.flying
|| GetComputerSettings().features.final_glide_terrain == FeaturesSettings::FinalGlideTerrain::OFF
|| route_planner == nullptr)
return;
// Create a visitor for the Reach code
TriangleCompound visitor(render_projection);
// Fill the TriangleCompound with all TriangleFans in range
route_planner->AcceptInRange(render_projection.GetScreenBounds(), visitor);
// Exit early if not fans found
if (visitor.fans.empty())
return;
// @todo: update this rendering
// Don't draw shade if
// .. shade feature disabled
// .. pan mode activated
if (GetComputerSettings().features.final_glide_terrain == FeaturesSettings::FinalGlideTerrain::SHADE &&
IsNearSelf()) {
#ifdef ENABLE_OPENGL
const ScopeVertexPointer vp(&visitor.fans.points[0]);
const GLEnable stencil_test(GL_STENCIL_TEST);
glClear(GL_STENCIL_BUFFER_BIT);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glStencilFunc(GL_ALWAYS, 1, 1);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
COLOR_WHITE.Set();
visitor.fans.DrawFill(canvas);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glStencilFunc(GL_NOTEQUAL, 1, 1);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
const GLBlend blend(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
canvas.Clear(Color(255, 255, 255, 77));
#elif defined(USE_GDI)
// Get a buffer for drawing a mask
Canvas &buffer = buffer_canvas;
// Set the pattern colors
buffer.SetBackgroundOpaque();
buffer.SetBackgroundColor(COLOR_WHITE);
buffer.SetTextColor(Color(0xd0, 0xd0, 0xd0));
// Paint the whole buffer canvas with a pattern brush (small dots)
buffer.Clear(look.above_terrain_brush);
// Select the TerrainLine pen
buffer.SelectHollowBrush();
buffer.Select(look.reach_pen_thick);
buffer.SetBackgroundColor(Color(0xf0, 0xf0, 0xf0));
// Draw the TerrainLine polygons
visitor.fans.DrawOutline(buffer);
// Select a white brush (will later be transparent)
buffer.SelectNullPen();
buffer.SelectWhiteBrush();
// Draw the TerrainLine polygons to remove the
// brush pattern from the polygon areas
visitor.fans.DrawFill(buffer);
// Copy everything non-white to the buffer
canvas.CopyTransparentWhite(0, 0,
render_projection.GetScreenWidth(),
render_projection.GetScreenHeight(),
buffer, 0, 0);
/* skip the separate terrain line step below, because we have done
it already */
return;
#endif
}
if (visitor.fans.size() == 1) {
/* only one fan: we can draw a simple polygon */
#ifdef ENABLE_OPENGL
const ScopeVertexPointer vp(&visitor.fans.points[0]);
look.reach_pen.Bind();
#else
// Select the TerrainLine pen
canvas.SelectHollowBrush();
canvas.Select(look.reach_pen);
canvas.SetBackgroundOpaque();
canvas.SetBackgroundColor(COLOR_WHITE);
// drop out extraneous line from origin
#endif
// Draw the TerrainLine polygon
visitor.fans.DrawOutline(canvas);
#ifdef ENABLE_OPENGL
look.reach_pen.Unbind();
#endif
} else {
/* more than one fan (turning reach enabled): we have to use a
stencil to draw the outline, because the fans may overlap */
#ifdef ENABLE_OPENGL
const ScopeVertexPointer vp(&visitor.fans.points[0]);
glEnable(GL_STENCIL_TEST);
glClear(GL_STENCIL_BUFFER_BIT);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glStencilFunc(GL_ALWAYS, 1, 1);
glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
COLOR_WHITE.Set();
visitor.fans.DrawFill(canvas);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glStencilFunc(GL_NOTEQUAL, 1, 1);
glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
look.reach_pen_thick.Bind();
visitor.fans.DrawOutline(canvas);
look.reach_pen_thick.Unbind();
glDisable(GL_STENCIL_TEST);
#elif defined(USE_GDI) || defined(USE_MEMORY_CANVAS)
// Get a buffer for drawing a mask
Canvas &buffer = buffer_canvas;
// Paint the whole buffer canvas white ( = transparent)
buffer.ClearWhite();
// Select the TerrainLine pen
buffer.SelectHollowBrush();
buffer.Select(look.reach_pen_thick);
buffer.SetBackgroundOpaque();
buffer.SetBackgroundColor(Color(0xf0, 0xf0, 0xf0));
// Draw the TerrainLine polygons
visitor.fans.DrawOutline(buffer);
// Select a white brush (will later be transparent)
buffer.SelectNullPen();
buffer.SelectWhiteBrush();
// Draw the TerrainLine polygons again to remove
// the lines connecting all the polygons
//
// This removes half of the TerrainLine line width !!
visitor.fans.DrawFill(buffer);
// Copy everything non-white to the buffer
canvas.CopyTransparentWhite(0, 0,
render_projection.GetScreenWidth(),
render_projection.GetScreenHeight(),
buffer, 0, 0);
#endif
}
}
