Ghosting around text

[Ono-Sendai]

See for example

There are some grey pixels around the edge of the glyphs that shouldn't be there.

[RuiwenTang]

@Ono-Sendai Thanks for using this library, could you provide the code to reproduce this issue?

[Ono-Sendai]

//=========================== Init SDL and OpenGL ================================
if(SDL_Init(SDL_INIT_VIDEO) != 0)
	throw glare::Exception("SDL_Init Error: " + std::string(SDL_GetError()));

// Set GL attributes, needs to be done before window creation.
setGLAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4); // We need to request a specific version for a core profile.
setGLAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 6);
setGLAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
setGLAttribute(SDL_GL_MULTISAMPLESAMPLES, 4);
setGLAttribute(SDL_GL_STENCIL_SIZE, 8); // Needed for Skity

int primary_W = 600;
int primary_H = 600;

win = SDL_CreateWindow("xx", 100, 100, primary_W, primary_H, SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
if(win == nullptr)
	throw glare::Exception("SDL_CreateWindow Error: " + std::string(SDL_GetError()));


gl_context = SDL_GL_CreateContext(win);
if(!gl_context)
	throw glare::Exception("OpenGL context could not be created! SDL Error: " + std::string(SDL_GetError()));

//SDL_GL_SetSwapInterval(0); // Disable Vsync

gl3wInit();


// ====================== Init SKity ======================================

	float density = 1;

	skity::GPUContext ctx(skity::GPUBackendType::kOpenGL, (void*)gl3wGetProcAddress);

	std::unique_ptr<skity::Canvas> canvas = skity::Canvas::MakeHardwareAccelationCanvas(primary_W, primary_H, density, &ctx);



const std::string font_path       = PlatformUtils::getFontsDirPath() + "/Segoeui.ttf"; // SegoeUI is shipped with Windows 7 onwards: https://learn.microsoft.com/en-us/typography/fonts/windows_7_font_list


canvas->setDefaultTypeface(skity::Typeface::MakeFromFile(font_path.c_str()));
skity::TextBlobBuilder builder;



glClearColor(1, 0, 0, 0);
glClearStencil(0x0);
glStencilMask(0xFF);
// blend is need for anti-alias
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_STENCIL_TEST);
	
glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
	
// paint controls the color and style when geometry is rendered
skity::Paint paint;
paint.setStyle(skity::Paint::kFill_Style);
paint.setColor(skity::ColorSetRGB(0x42, 0x85, 0xF4));
	
// create path
skity::Path path;
/*path.moveTo(100, 10);
path.lineTo(150, 50);
path.lineTo(100, 50);
path.close();*/
path.moveTo(199 + (float)std::sin(timer.elapsed()) * 10, 34);
path.lineTo(253, 143);
path.lineTo(374, 160);
path.lineTo(287, 244);
path.lineTo(307, 365);
path.lineTo(199, 309);
path.lineTo(97, 365);
path.lineTo(112, 245);
path.lineTo(26, 161);
path.lineTo(146, 143);
path.close();
	
	
/*skity::TextBlobBuilder builder;
std::shared_ptr<skity::TextBlob> text_blob = builder.buildTextBlob("Hello", paint);
	
text_blob->getTextRun().draw*/
	
paint.setTextSize(14.f);
paint.setAntiAlias(false);
paint.setFillColor(1.f, 1.f, 1.f, 1.f);
paint.setStyle(skity::Paint::kFill_Style);
paint.setTypeface(canvas->getDefaultTypeface());

std::shared_ptr<skity::TextBlob> text_blob = builder.buildTextBlob("abcdefghijklmnopqrtsuvwxyzABCDEFGHIJKLMNOPQRTSUVWXYZ", paint);
canvas->drawTextBlob(text_blob.get(), 20.f, 64.f, paint);

std::shared_ptr<skity::TextBlob> text_blob2 = builder.buildTextBlob("iiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiii", paint);
canvas->drawTextBlob(text_blob2.get(), 20.f, 84.f, paint);
	
	
canvas->drawPath(path, paint);
canvas->flush();