One solution is to use pango's cairo bindings. Using it could get quite confusing really fast so here's a essentials. You could create class around it in C++ if you want.
#include <pango/pangocairo.h>
// Pango context
PangoContext* pangoContext = pango_font_map_create_context(
pango_cairo_font_map_get_default());
// Layout and attributes
PangoLayout* pangoLayout = pango_layout_new(pangoContext);
pango_layout_set_wrap(pangoLayout, PANGO_WRAP_WORD_CHAR);
pango_layout_set_width(pangoLayout, maxWidth * PANGO_SCALE);
pango_layout_set_height(pangoLayout, maxHeight * PANGO_SCALE);
// Set font
PangoFontDescription* fontDesc =
pango_font_description_from_string("Verdana 10");
pango_layout_set_font_description(pangoLayout, fontDesc);
pango_font_description_free(fontDesc);
// Set text to render
pango_layout_set_text(pangoLayout, text.data(), text.length());
// Allocate buffer
const cairo_format_t format = CAIRO_FORMAT_A8;
const int stride = cairo_format_stride_for_width(format, maxWidth);
GLubyte* buffer = new GLubyte[stride * maxHeight];
std::fill(buffer, buffer + stride * maxHeight, 0);
// Create cairo surface for buffer
cairo_surface_t* crSurface = cairo_image_surface_create_for_data(
buffer, format, maxWidth, maxHeight, stride);
if (cairo_surface_status(crSurface) != CAIRO_STATUS_SUCCESS) {
// Error
}
// Create cairo context
cairo_t* crContext = cairo_create(crSurface);
if (cairo_status(crContext) != CAIRO_STATUS_SUCCESS) {
// Error
}
// Draw
cairo_set_source_rgb(crContext, 1.0, 1.0, 1.0);
pango_cairo_show_layout(crContext, pangoLayout);
// Cleanup
cairo_destroy(crContext);
cairo_surface_destroy(crSurface);
g_object_unref(pangoLayout);
g_object_unref(pangoContext);
// TODO: you can do whatever you want with buffer now
// copy on the texture maybe?
delete[] buffer;
In this case buffer will contain 8 bit alpha channel values only. Fiddle with format variable if you want something else. Compiling... pkg-config --cflags --libs pangocairo should do it on Linux. I have no idea about windows.
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一种解决方案是使用 pango 的 cairo 绑定。使用它可能很快就会变得非常混乱，所以这里有一个要点。如果需要，您可以在 C++ 中围绕它创建类。
在这种情况下，缓冲区将仅包含 8 位 Alpha 通道值。如果你想要别的东西，可以修改格式变量。编译...
pkg-config --cflags --libs pangocairo应该在 Linux 上完成。我对窗户一无所知。One solution is to use pango's cairo bindings. Using it could get quite confusing really fast so here's a essentials. You could create class around it in C++ if you want.
In this case buffer will contain 8 bit alpha channel values only. Fiddle with format variable if you want something else. Compiling...
pkg-config --cflags --libs pangocairoshould do it on Linux. I have no idea about windows.