Hm... interesting. I am getting a promising result now with this code:
BaseBitmap* MyClass::CreateTextBitmap(const String &text, const Vector &textColor, const Vector &bgColor, Float bgOpacity, Int32 margin)
{
if (!_clipmap)
{
_clipmap.Assign(GeClipMap::Alloc());
if (!_clipmap)
return nullptr;
}
// Dummy draw, just to get the text dimensions
if (_clipmap->Init(0, 0, 32) != IMAGERESULT::OK)
return nullptr;
_clipmap->BeginDraw();
Int32 width = _clipmap->GetTextWidth(text) + margin * 2;
Int32 height = _clipmap->GetTextHeight() + margin * 2;
_clipmap->EndDraw();
_clipmap->Destroy();
// Begin actual drawing
if (_clipmap->Init(width, height, 32) != IMAGERESULT::OK)
return nullptr;
_clipmap->BeginDraw();
_clipmap->EndDraw();
width = _clipmap->GetBw();
height = _clipmap->GetBh();
_clipmap->BeginDraw();
// Background. Fill clipmap with a rectangle, overpainting possibly existing text
// Drawn with alpha = 255, because this alpha value just defines the transparency of the drawn color over the background.
// The actual background alpha is set later.
const Int32 backgroundColorR = (Int32)(bgColor.x * 255.0);
const Int32 backgroundColorG = (Int32)(bgColor.y * 255.0);
const Int32 backgroundColorB = (Int32)(bgColor.z * 255.0);
_clipmap->SetColor(backgroundColorR, backgroundColorG, backgroundColorB, 255);
_clipmap->FillRect(0, 0, width - 1, height - 1);
const Int32 backgroundOpacity = (Int32)(bgOpacity * 255.0);
// Text
// Drawn with alpha = 255, because this alpha value just defines the transparency of the drawn color over the background.
_clipmap->SetColor((Int32)(textColor.x * 255.0), (Int32)(textColor.y * 255.0), (Int32)(textColor.z * 255.0), 255);
_clipmap->TextAt(margin, margin, text);
_clipmap->EndDraw();
BaseBitmap *bitmap = _clipmap->GetBitmap()->GetClone();
if (!bitmap)
return nullptr;
BaseBitmap *alphaBitmap = bitmap->AddChannel(true, true);
if (!alphaBitmap)
return nullptr;
alphaBitmap = bitmap->GetInternalChannel();
if (!alphaBitmap)
return nullptr;
for (Int32 y = 0; y < bitmap->GetBh(); ++y)
{
for (Int32 x = 0; x < bitmap->GetBw(); ++x)
{
// 100% transparent corners
if ((x == 0 && y == 0) || (x == width - 1 && y == height - 1) ||
(x == 0 && y == height - 1) || (x == width - 1 && y == 0))
{
bitmap->SetAlphaPixel(alphaBitmap, x, y, 0);
}
else // All other pixels: semi transparent
{
bitmap->SetAlphaPixel(alphaBitmap, x, y, backgroundOpacity);
}
}
}
return bitmap;
}
I wonder why this looks so different... I still didn't set opaque pixels for the text, but it seems to be a good start...
