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Text alignment and point size

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This commit is contained in:
Dan Paulat 2021-08-07 08:12:14 -05:00
parent ee0f3b35bf
commit 89ca94eda8
4 changed files with 42 additions and 9 deletions
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24
scwx-qt/source/scwx/qt/gl/text_shader.cpp
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@ -55,11 +55,12 @@ bool TextShader::Initialize()
void TextShader::RenderText(const std::string& text,
float x,
float y,
float scale,
float pointSize,
const glm::mat4& projection,
const boost::gil::rgba8_pixel_t& color,
std::shared_ptr<util::Font> font,
GLuint textureId)
GLuint textureId,
TextAlign align)
{
OpenGLFunctions& gl = p->gl_;
@ -74,9 +75,26 @@ void TextShader::RenderText(const std::string& text,
gl.glActiveTexture(GL_TEXTURE0);
gl.glBindTexture(GL_TEXTURE_2D, textureId);
switch (align)
{
case TextAlign::Left:
// Do nothing
break;
case TextAlign::Center:
// X position is the center of text, subtract half length
x -= font->TextLength(text, pointSize) * 0.5f;
break;
case TextAlign::Right:
// X position is the end of text, subtract length
x -= font->TextLength(text, pointSize);
break;
}
std::shared_ptr<util::FontBuffer> buffer =
std::make_shared<util::FontBuffer>();
font->BufferText(buffer, text, x, y, scale, color);
font->BufferText(buffer, text, x, y, pointSize, color);
buffer->Render(gl);
}

10
scwx-qt/source/scwx/qt/gl/text_shader.hpp
View file

@ -15,6 +15,13 @@ namespace qt
namespace gl
{
enum class TextAlign
{
Left,
Center,
Right
};
class TextShaderImpl;
class TextShader : public ShaderProgram
@ -37,7 +44,8 @@ public:
const glm::mat4& projection,
const boost::gil::rgba8_pixel_t& color,
std::shared_ptr<util::Font> font,
GLuint textureId);
GLuint textureId,
TextAlign align = TextAlign::Left);
void SetProjection(const glm::mat4& projection);
private:

13
scwx-qt/source/scwx/qt/util/font.cpp
View file

@ -62,6 +62,9 @@ static const std::string CODEPOINTS =
static const std::string logPrefix_ = "[scwx::qt::util::font] ";
static constexpr float BASE_POINT_SIZE = 72.0f;
static constexpr float POINT_SCALE = 1.0f / BASE_POINT_SIZE;
static std::unordered_map<std::string, std::shared_ptr<Font>> fontMap_;
class FontImpl
@ -96,11 +99,13 @@ float Font::BufferText(std::shared_ptr<FontBuffer> buffer,
const std::string& text,
float x,
float y,
float scale,
float pointSize,
boost::gil::rgba8_pixel_t color) const
{
static constexpr float colorScale = 1.0f / 255.0f;
const float scale = pointSize * POINT_SCALE;
float r = color[0] * colorScale;
float g = color[1] * colorScale;
float b = color[2] * colorScale;
@ -154,8 +159,10 @@ float Font::Kerning(char c1, char c2) const
return 0.0f;
}
float Font::TextLength(const std::string& text, float scale) const
float Font::TextLength(const std::string& text, float pointSize) const
{
const float scale = pointSize * POINT_SCALE;
float x = 0.0f;
for (size_t i = 0; i < text.length(); ++i)
@ -232,7 +239,7 @@ std::shared_ptr<Font> Font::Create(const std::string& resource)
font->p->atlas_ = ftgl::texture_atlas_new(512, 512, 1);
ftgl::texture_font_t* textureFont = ftgl::texture_font_new_from_memory(
font->p->atlas_, 72, fontData.constData(), fontData.size());
font->p->atlas_, BASE_POINT_SIZE, fontData.constData(), fontData.size());
textureFont->rendermode = ftgl::RENDER_SIGNED_DISTANCE_FIELD;

4
scwx-qt/source/scwx/qt/util/font.hpp
View file

@ -33,10 +33,10 @@ public:
const std::string& text,
float x,
float y,
float scale,
float pointSize,
boost::gil::rgba8_pixel_t color) const;
float Kerning(char c1, char c2) const;
float TextLength(const std::string& text, float scale) const;
float TextLength(const std::string& text, float pointSize) const;
GLuint GenerateTexture(OpenGLFunctions& gl);