How to render text in SDL2? - c

Question

I'm using an SDL_Window and SDL_Renderer.
Is it possible to use SDL_TTF with SDL_Render/SDL_Window? If so, how?

Answer 1

Yep, it is possible, given that you have a renderer and a window plus you don't really have any thoughts on dabbling with surfaces then you might want to mind on creating texture, here is a sample code
//this opens a font style and sets a size
TTF_Font* Sans = TTF_OpenFont("Sans.ttf", 24);
// this is the color in rgb format,
// maxing out all would give you the color white,
// and it will be your text's color
SDL_Color White = {255, 255, 255};
// as TTF_RenderText_Solid could only be used on
// SDL_Surface then you have to create the surface first
SDL_Surface* surfaceMessage =
TTF_RenderText_Solid(Sans, "put your text here", White);
// now you can convert it into a texture
SDL_Texture* Message = SDL_CreateTextureFromSurface(renderer, surfaceMessage);
SDL_Rect Message_rect; //create a rect
Message_rect.x = 0; //controls the rect's x coordinate
Message_rect.y = 0; // controls the rect's y coordinte
Message_rect.w = 100; // controls the width of the rect
Message_rect.h = 100; // controls the height of the rect
// (0,0) is on the top left of the window/screen,
// think a rect as the text's box,
// that way it would be very simple to understand
// Now since it's a texture, you have to put RenderCopy
// in your game loop area, the area where the whole code executes
// you put the renderer's name first, the Message,
// the crop size (you can ignore this if you don't want
// to dabble with cropping), and the rect which is the size
// and coordinate of your texture
SDL_RenderCopy(renderer, Message, NULL, &Message_rect);
// Don't forget to free your surface and texture
SDL_FreeSurface(surfaceMessage);
SDL_DestroyTexture(Message);
I tried to explain the code line by line, you don't see any window right there since I already assumed that you knew how to initialize a renderer which would give me an idea that you also know how to initialize a window, then all you need is the idea on how to initialize a texture.
Minor questions here, did your window open? was it colored black? if so then my thoughts were right, if not, then you can just ask me and I could change this code to implement the whole section which consists of a renderer and a window.

Answer 2

SDL_ttf minimal runnable example
Not super efficient, but easy to integrate. For efficiency see: How to render fonts and text with SDL2 efficiently?
Kept in a separate repo than the main SDL source, but hosted on the same official server, so should be fine: http://hg.libsdl.org/SDL_ttf/
Newlines won't work. You have to work with line heights.
Compile and run:
sudo apt-get install -y libsdl2-dev
gcc -lSDL2 -lSDL2_ttf -o ttf ttf.c
./ttf /usr/share/fonts/truetype/freefont/FreeMonoOblique.ttf
You must pass the path of a TTF font file to the program.
ttf.c
#include <stdlib.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>
#define WINDOW_WIDTH 300
#define WINDOW_HEIGHT (WINDOW_WIDTH)
/*
- x, y: upper left corner.
- texture, rect: outputs.
*/
void get_text_and_rect(SDL_Renderer *renderer, int x, int y, char *text,
TTF_Font *font, SDL_Texture **texture, SDL_Rect *rect) {
int text_width;
int text_height;
SDL_Surface *surface;
SDL_Color textColor = {255, 255, 255, 0};
surface = TTF_RenderText_Solid(font, text, textColor);
*texture = SDL_CreateTextureFromSurface(renderer, surface);
text_width = surface->w;
text_height = surface->h;
SDL_FreeSurface(surface);
rect->x = x;
rect->y = y;
rect->w = text_width;
rect->h = text_height;
}
int main(int argc, char **argv) {
SDL_Event event;
SDL_Rect rect1, rect2;
SDL_Renderer *renderer;
SDL_Texture *texture1, *texture2;
SDL_Window *window;
char *font_path;
int quit;
if (argc == 1) {
font_path = "FreeSans.ttf";
} else if (argc == 2) {
font_path = argv[1];
} else {
fprintf(stderr, "error: too many arguments\n");
exit(EXIT_FAILURE);
}
/* Inint TTF. */
SDL_Init(SDL_INIT_TIMER | SDL_INIT_VIDEO);
SDL_CreateWindowAndRenderer(WINDOW_WIDTH, WINDOW_WIDTH, 0, &window, &renderer);
TTF_Init();
TTF_Font *font = TTF_OpenFont(font_path, 24);
if (font == NULL) {
fprintf(stderr, "error: font not found\n");
exit(EXIT_FAILURE);
}
get_text_and_rect(renderer, 0, 0, "hello", font, &texture1, &rect1);
get_text_and_rect(renderer, 0, rect1.y + rect1.h, "world", font, &texture2, &rect2);
quit = 0;
while (!quit) {
while (SDL_PollEvent(&event) == 1) {
if (event.type == SDL_QUIT) {
quit = 1;
}
}
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
SDL_RenderClear(renderer);
/* Use TTF textures. */
SDL_RenderCopy(renderer, texture1, NULL, &rect1);
SDL_RenderCopy(renderer, texture2, NULL, &rect2);
SDL_RenderPresent(renderer);
}
/* Deinit TTF. */
SDL_DestroyTexture(texture1);
SDL_DestroyTexture(texture2);
TTF_Quit();
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return EXIT_SUCCESS;
}
GitHub upstream.
Tested in Ubuntu 16.04, SDL 2.0.4.

Answer 3

Yes it is. You create a surface with the text you want and then convert it to a texture that you can render.
Some sample code from one of my projects:
std::string score_text = "score: " + std::to_string(score);
SDL_Color textColor = { 255, 255, 255, 0 };
SDL_Surface* textSurface = TTF_RenderText_Solid(font, score_text.c_str(), textColor);
SDL_Texture* text = SDL_CreateTextureFromSurface(renderer, textSurface);
int text_width = textSurface->w;
int text_height = textSurface->h;
SDL_FreeSurface(textSurface);
SDL_Rect renderQuad = { 20, win_height - 30, text_width, text_height };
SDL_RenderCopy(renderer, text, NULL, &renderQuad);
SDL_DestroyTexture(text);
This assumes you've properly initialized SDL_ttf and loaded a font. In the example scoreis an int. The screen gets cleared and rendered to somewhere else (I didn't include that part).
For a full working example, check out the tutorial for SDL_ttf in SDL2 at Lazy Foo.

Answer 4

Edited to make it easier to follow along, to use Roboto.ttf (https://fonts.google.com/specimen/Roboto) instead of Verdana.ttf and to add not2qubit suggestion. Please keep in mind that this doesn't follow any C++ class convention at all. I just wanted to be sure that this would be easy enough to copy/paste and run.
To build this you need to add the library SDL_ttf (https://www.libsdl.org/projects/SDL_ttf/).
g++ demo.cpp -o demo -Wall -I include -lsdl2 -lsdl2_ttf
Since there are some people struggling with more complex code, I've included my own snippet here to help some beginners like myself. This will just show a red screen with a black hello world. Don't forget to add -lsdl2 and -lsdl2_ttf on your build and include the Verdana.ttf font on the same folder.
#include <iostream>
#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h> //This is an sample library not included with stock SDL2. https://www.libsdl.org/projects/SDL_ttf/release-1.2.html
const char* WINDOW_TITLE = "Hello World SDL2 + TTF";
const char* FONT_NAME = "roboto.ttf";
const int FONT_SIZE = 128;
const int WINDOW_WIDTH = 1280, WINDOW_HEIGHT = 720;
SDL_Window* Window; // Window created by SDL.
SDL_Renderer* Renderer; // The renderer that shows our textures.
SDL_Event WindowEvent; // Event capturer from SDL Window.
SDL_Color TextColor = { 255, 0, 0, 255}; // Red SDL color.
TTF_Font* Font; // The font to be loaded from the ttf file.
SDL_Surface* TextSurface; // The surface necessary to create the font texture.
SDL_Texture* TextTexture; // The font texture prepared for render.
SDL_Rect TextRect; // Text rectangle area with the position for the texture text.
void CreateWindow() {
Window = SDL_CreateWindow(WINDOW_TITLE, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_ALLOW_HIGHDPI);
if (!Window)
std::cout << "There was a problem creating the window.";
Renderer = SDL_CreateRenderer(Window, -1, 0);
if (!Renderer)
std::cout << "There was a problem creating the renderer.";
}
void CreateText(const char* Message) {
TTF_Init();
TTF_Font *font = TTF_OpenFont(FONT_NAME, FONT_SIZE);
if (!font)
std::cout << "Couldn't find/init open ttf font." << std::endl;
TextSurface = TTF_RenderText_Solid(font, Message, TextColor);
TextTexture = SDL_CreateTextureFromSurface(Renderer, TextSurface);
TextRect.x = WINDOW_WIDTH - TextSurface->w * 0.5; // Center horizontaly
TextRect.y = WINDOW_HEIGHT - TextSurface->h * 0.5; // Center verticaly
TextRect.w = TextSurface->w;
TextRect.h = TextSurface->h;
// After you create the texture you can release the surface memory allocation because we actually render the texture not the surface.
SDL_FreeSurface(TextSurface);
TTF_Quit();
}
bool IsPollingEvent() {
while(SDL_PollEvent(&WindowEvent)) {
switch (WindowEvent.type) {
case SDL_QUIT: return false;
}
}
return true;
}
void RenderText() {
SDL_SetRenderDrawColor(Renderer, 0, 0, 0, 255); // Make window bg black.
SDL_RenderClear(Renderer); // Paint screen black.
SDL_RenderCopy(Renderer, TextTexture, NULL, &TextRect); // Add text to render queue.
SDL_RenderPresent(Renderer); // Render everything that's on the queue.
SDL_Delay(10); // Delay to prevent CPU overhead as suggested by the user `not2qubit`
}
void ClearMemory() {
SDL_DestroyTexture(TextTexture);
SDL_DestroyRenderer(Renderer);
SDL_DestroyWindow(Window);
SDL_Quit();
std::cout << "Clear proccess done." << std::endl;
}
int main() {
CreateWindow();
CreateText("Hello SDL_Ttf");
while (IsPollingEvent()) {
RenderText();
}
ClearMemory();
return EXIT_SUCCESS;
}

Answer 5

For Powershell on Windows
If you're trying to do this from Powershell on Windows, you'll soon find out that this is a real PITA. Until now...
I've just spent the hours to debug all the details to get this to work, when you want to insist using Clang++ and SDL2 to render a native Windows window with text.
There are 3 things you need to install; LLVM, SDL2, SDL2_ttf. Then you have to ensure your program will find your libraries, headers and fonts. This is basically summarized in the following program here:
//---------------------------------------------------------------------
// Name: HelloSDL2.cpp
// Author: EAML
// Date: 2021-05-16
//
// Description:
// A minimal PoC for producing a native SDL2 Windows app that can
// be ran from either Windows Explorer or from Powershell console.
// It's designed to use minimal command line, compiler options,
// and dependencies... It will display a gray window for 2 sec's.
//
// Dependencies:
// [1] LLVM Clang++ compiler package
// [2] SDL2 Libraries (DLL's) and Header files (*.h)
// [3] TTF Libraries (DLL's) and Header files (*.h)
//
// Notes:
// There is a slight variation in the bahaviour, depending on:
// (a) if you compile as a Windows GUI: the text will not show.
// (b) if you compile as a console CLI: text will show in both terminal and/or in a 2nd new window
// (c) You may need to use "main()" for console and "WinMain()" for GUI...
// (c) to install on Linux, use packages: clang, libsdl2-dev
// (d) Someone said: #define SDL_MAIN_HANDLED ...
//
// To Run:
// cp .\SDL2\lib\x64\SDL2.dll C:\Windows\. # For SDL2
// cp .\SDL2_ttf\lib\x64\*.dll C:\Windows\. # For SDL2 TTF
// cp C:\Windows\Fonts\arial.ttf . # Get a font...
//
// For a CLI version, with console output in 2nd Window:
// # clang++.exe -std=c++11 main.cpp -o main.exe -L .\SDL2\lib\x64\ -L .\SDL2_ttf\lib\x64\ -I .\SDL2_ttf\include\ -I .\SDL2\include\ -lShell32 -lSDL2main -lSDL2 -lSDL2_ttf -Wno-narrowing -Xlinker /subsystem:console
//
// For a GUI version, without any console output:
// # clang++.exe -std=c++11 main.cpp -o main.exe -L .\SDL2\lib\x64\ -L .\SDL2_ttf\lib\x64\ -I .\SDL2_ttf\include\ -I .\SDL2\include\ -lShell32 -lSDL2main -lSDL2 -lSDL2_ttf -Wno-narrowing -Xlinker /subsystem:windows
//
// References:
// [1] https://github.com/llvm/llvm-project/releases
// [2] http://www.libsdl.org/release/SDL2-devel-2.0.14-VC.zip
// [3] https://www.libsdl.org/projects/SDL_ttf/release/SDL2_ttf-devel-2.0.15-VC.zip
// [4] https://www.libsdl.org/projects/SDL_ttf/docs/SDL_ttf.html
// [5] http://www.sdltutorials.com/sdl-ttf
//---------------------------------------------------------------------
//#include <SDL2/SDL.h>
#include "SDL2/include/SDL.h"
#include "SDL2_ttf/include/SDL_ttf.h"
#include <stdio.h>
#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480
#define WINDOW_TITLE "Hello SDL2!"
//#define WINDOW_TEXT "Hello World!"
void drawText ( SDL_Surface* screen, char* string, int size, int x, int y, SDL_Color fgC, SDL_Color bgC) {
// Remember to call TTF_Init(), TTF_Quit(), before/after using this function.
TTF_Font* font = TTF_OpenFont("arial.ttf", size);
if(!font) {
printf("[ERROR] TTF_OpenFont() Failed with: %s\n", TTF_GetError());
exit(2);
}
TTF_SetFontStyle(font, TTF_STYLE_BOLD);
//SDL_Surface* textSurface = TTF_RenderText_Solid(font, string, fgC);
SDL_Surface* textSurface = TTF_RenderText_Shaded(font, string, fgC, bgC);
SDL_Rect textLocation = { x, y, 0, 0 };
SDL_BlitSurface(textSurface, NULL, screen, &textLocation);
SDL_FreeSurface(textSurface);
TTF_CloseFont(font);
//printf("Oh My Goodness, an error : %s\n", TTF_GetError()); return 1;
}
int main(int argc, char* args[]) {
SDL_Window* window = NULL; // The window we are rendering to
SDL_Surface* screenSurface = NULL; // The surface contained by the window
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
printf( "SDL could not initialize! SDL Error: %s\n", SDL_GetError());
return 1;
}
window = SDL_CreateWindow(WINDOW_TITLE, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
if (window == NULL) {
printf( "Window could not be created! SDL Error: %s\n", SDL_GetError());
return 1;
}
screenSurface = SDL_GetWindowSurface(window);
SDL_FillRect(screenSurface, NULL, SDL_MapRGB(screenSurface->format, 0x80, 0x80, 0x80)); // Set a gray background canvas
SDL_UpdateWindowSurface(window);
//-----------------------------------------------------
// Draw the Text
//-----------------------------------------------------
if(TTF_Init() == -1) {
printf("[ERROR] TTF_Init() Failed with: %s\n", TTF_GetError());
exit(2);
}
SDL_Color fgC1 = { 0xff,0xff,0xff }, bgC1 = {0x00,0x00,0xa0}; // white text on blue background
SDL_Color fgC2 = { 0x00,0x00,0x00 }, bgC2 = {0xff,0x00,0xff}; // black text on magenta background
drawText( screenSurface, (char*) "Hello World! # (x=50, y=100)", 18, 50,100, fgC1, bgC1); // 18 pt # (x=100,y=150)
drawText( screenSurface, (char*) "arial.ttf # (x=200, y=150)", 16, 200,150, fgC2, bgC2); // 16 pt # (x=100,y=150)
SDL_UpdateWindowSurface(window);
TTF_Quit();
//-----------------------------------------------------
// Get some info...
//-----------------------------------------------------
SDL_version compiled;
SDL_version linked;
SDL_version ttfv;
SDL_VERSION(&compiled);
SDL_GetVersion(&linked);
SDL_TTF_VERSION(&ttfv);
printf("Compiled using SDL version : %d.%d.%d \n", compiled.major, compiled.minor, compiled.patch);
printf("and linked with SDL version : %d.%d.%d \n", linked.major, linked.minor, linked.patch);
printf("and using SDL_TTF version : %d.%d.%d \n", ttfv.major, ttfv.minor, ttfv.patch);
SDL_Delay(3000); // Wait 3 seconds
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}
The result of running the code above is this:
How to get to this point?
Install LLVM for Windows:
Check the box for [x] add to Windows PATH.
If you didn't add LLVM to your Windows PATH, then at least add it temporarily and manually.
Open a Powershell and type: $env:path += ";C:\Program Files\LLVM\bin"
Install SDL2 for Windows:
Download and extract the SDL2 & SDL2_ttf runtime binaries (*.dll) and header libraries (found in [2,3])
and put them into separate SDL folder(s) in the same directory as your C++ file.
You should now have something like:
# tree --dirsfirst ./SDL2{,_ttf} -P *.h
./SDL2
├── include
│   ├── begin_code.h
│   ├── close_code.h
│   ├── SDL.h
│   ├── SDL_assert.h
...
│   ├── SDL_version.h
│   ├── SDL_video.h
│   └── SDL_vulkan.h
└── lib
./SDL2_ttf
└── include
   └── SDL_ttf.h
# tree --dirsfirst ./SDL2{,_ttf}/lib -P *.dll
./SDL2/lib
├── x64
│   └── SDL2.dll
└── x86
└── SDL2.dll
./SDL2_ttf/lib
├── x64
│   ├── libfreetype-6.dll
│   ├── SDL2_ttf.dll
│   └── zlib1.dll
└── x86
├── libfreetype-6.dll
├── SDL2_ttf.dll
└── zlib1.dll
Copy all the relevant downloaded DLL's into the C:\Windows\, unless you know how to make clang++.exe able to find them. (I wasn't able...)
cd C:\path\to\main.cpp
cp .\SDL2\lib\x64\SDL2.dll C:\Windows\. # For SDL2
cp .\SDL2_ttf\lib\x64\*.dll C:\Windows\. # For SDL2 TTF
cp C:\Windows\Fonts\arial.ttf . # Get a font...
Download the above SDL2 "Hello World" Windows program.
Use the Minimal PoC code from here.
Compile the program with:
clang++.exe -std=c++11 main2.cpp -o main.exe -L .\SDL2\lib\x64\ -L .\SDL2_ttf\lib\x64\ -I .\SDL2_ttf\include\ -I .\SDL2\include\ -lShell32 -lSDL2main -lSDL2 -lSDL2_ttf -Wno-narrowing -Xlinker /subsystem:windows
The order of how the libraries are placed, seem to have an importance. Make sure it's like above.
Also, notice the two different -Xlinker options:
/subsystem:windows # This give you only one window but no console output
/subsystem:console # This give you console output, but in a 2nd window when in GUI
To see other linker optins, use:
link.exe /link
link.exe /lib
# The most relevant are:
/DLL
/ENTRY:symbol
/LIBPATH:dir
/MACHINE:{ARM|ARM64|EBC|X64|X86}
/SUBSYSTEM:{CONSOLE | NATIVE | POSIX | WINDOWS | WINDOWSCE |...}
/VERBOSE
You are now good to go!
Download References
LLVM Clang++ compiler package
SDL2 Libraries (DLL's) and Header files (*.h)
SDL2 TTF Libraries (DLL's) and Header files (*.h)
Useful SDL wiki

Answer 6

If you want it to do with class:
// Include somewhere
#include <SDL2/SDL_ttf.h>
// Do not forget to init TTF once somewhere main.cpp
if (TTF_Init()==-1) {
printf("Failed to TTF: %s", SDL_GetError());
return 1;
}
// Have a font instance ready
TTF_Font* font = TTF_OpenFont("assets/fonts/ugly.ttf", 72);
if (font==NULL){
printf("Failed to load font: %s", SDL_GetError());
}
// Have a Text instance ready
// (Class file is below this code)
// Also you need to provide SDL_Renderer* renderer to init
Text* fps_tracker = new Text(renderer, font);
// Somewhere in while true
fps_tracker.setText("FPS: 232");
// Render it
fps_tracker.render();
Here is the class:
using namespace std;
#include <string>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_ttf.h>
class Text {
SDL_Texture* texture = NULL;
SDL_Rect position;
TTF_Font* font;
SDL_Renderer* renderer;
SDL_Color color;
string text;
public:
Text(SDL_Renderer* renderer, TTF_Font* font, string text="", int x=0, int y=0, SDL_Color color={255, 255, 255}) {
position.x = x;
position.y = y;
this->color = color;
this->font = font;
this->renderer = renderer;
}
void setText(string text) {
if (this->text==text){
return;
}
this->text = text;
SDL_DestroyTexture(texture);
SDL_Surface* surface = TTF_RenderText_Solid(font, text.c_str(), color);
if (surface==NULL) {
printf("Failed to render text: %s", SDL_GetError());
}
position.w = surface->w;
position.h = surface->h;
texture = SDL_CreateTextureFromSurface(renderer, surface);
SDL_FreeSurface(surface);
}
void render() {
SDL_RenderCopy(renderer, texture, NULL, &position);
}
~Text() {
SDL_DestroyTexture(texture);
}
};

Answer 7

If you don't want to or can't use the SDL2 TTF library, you can easily implement it yourself with just the freetype library.
Include freetype
#include <ft2build.h>
#include FT_FREETYPE_H
Create texture class
class texture
{
public:
texture() : t{nullptr} {}
texture(const texture &) = delete;
texture &operator=(const texture &) = delete;
texture(texture &&o) : t{o.t}
{
o.t = nullptr;
}
inline texture &operator=(texture &&o)
{
release();
t = o.t;
o.t = nullptr;
return *this;
}
inline texture(SDL_Renderer *renderer, void *image, int width, int height, int depth, int pitch, uint32_t rmask, uint32_t gmask, uint32_t bmask, uint32_t amask) : t{nullptr}
{
attach_image(renderer, image, width, height, depth, pitch, rmask, gmask, bmask, amask);
}
inline void attach_image(SDL_Renderer *renderer, void *image, int width, int height, int depth, int pitch, uint32_t rmask, uint32_t gmask, uint32_t bmask, uint32_t amask)
{
release();
SDL_Surface *s = SDL_CreateRGBSurfaceFrom(image, width, height, depth, pitch, rmask, gmask, bmask, amask);
t = SDL_CreateTextureFromSurface(renderer, s);
SDL_FreeSurface(s);
}
inline void draw(SDL_Renderer *renderer, const SDL_Rect *src, const SDL_Rect *dest) const
{
if (t)
SDL_RenderCopyEx(renderer, t, src, dest, 0, nullptr, SDL_FLIP_NONE);
}
int width() const
{
if(!t) return 0;
int w;
SDL_QueryTexture(t, nullptr, nullptr, &w, nullptr);
return w;
}
int height() const {
if(!t) return 0;
int h;
SDL_QueryTexture(t, nullptr, nullptr, nullptr, &h);
return h;
}
~texture()
{
release();
}
private:
SDL_Texture *t;
inline void release()
{
if (t)
SDL_DestroyTexture(t);
t = nullptr;
}
};
Create glyph class
struct character : texture
{
using texture::texture;
unsigned int advance;
int bearing_x;
int bearing_y;
};
Determine endianness and set up masks
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
#define rmask 0x000000ff
#define gmask 0x0000ff00
#define bmask 0x00ff0000
#define amask 0xff000000
#else
#define rmask 0xff000000
#define gmask 0x00ff0000
#define bmask 0x0000ff00
#define amask 0x000000ff
#endif
Create converter from free type's 8bit pixel depth to 32bit for SDL2
void convert_8_to_32_depth(std::vector<uint32_t> &res, unsigned char *image, int width, int height)
{
res.clear();
res.reserve(width * height);
for (int y = 0; y < height; ++y)
{
for (int x = 0; x < width; ++x)
{
if (image[y * width + x])
res.push_back(amask);
else
res.push_back(0);
}
}
}
Create font storage texture class
struct lib
{
lib() = default;
lib(SDL_Renderer *renderer, int height)
{
init(renderer, height);
}
void init(SDL_Renderer *renderer, int height)
{
FT_Library ft;
if (FT_Init_FreeType(&ft))
{
std::cout << "Can't init freetype lib\n";
}
FT_Face face;
//use if you have font data in array
// if (FT_New_Memory_Face(ft, font_array, std::size(font_array), 0, &face))
// {
// std::cout << "Failed to load font\n";
// }
if (FT_New_Face(ft, "location/to/my/font.ttf", 0, &face))
{
std::cout << "Failed to load font\n";
}
//set size of future glyphs
FT_Set_Pixel_Sizes(face, 0, height);
std::vector<uint32_t> image;
for (unsigned int c = 0; c < 256; ++c)
{
//load freetype glyph
if (FT_Load_Char(face, c, FT_LOAD_RENDER))
{
std::cout << "failed to load glyph\n";
}
if (face->glyph->bitmap.width)
{
///get image data that works for sdl2
convert_8_to_32_depth(image, face->glyph->bitmap.buffer, face->glyph->bitmap.width, face->glyph->bitmap.rows);
chars[c].attach_image(renderer, image.data(), face->glyph->bitmap.width, face->glyph->bitmap.rows,
32, face->glyph->bitmap.width * sizeof(decltype(image)::value_type),
rmask, gmask, bmask, amask);
}
chars[c].bearing_x = face->glyph->bitmap_left;
chars[c].bearing_y = face->glyph->bitmap_top;
chars[c].advance = face->glyph->advance.x;
}
FT_Done_Face(face);
FT_Done_FreeType(ft);
}
character chars[256];
};
Print text function
void print_text(SDL_Renderer *renderer, int x, int y, int height, std::string_view text)
{
static constexpr int default_height = 50;
//store map of each renderer used to avoid creating more libs than neccesary
static std::map<SDL_Renderer *, lib> l;
const lib& ts = l.try_emplace(renderer, renderer, default_height).first->second;
float scale = height / default_height;
SDL_Rect dest;
for (auto c : text)
{
dest.x = x + ts.chars[c].bearing_x * scale;
dest.y = y - ts.chars[c].bearing_y * scale;
dest.w = ts.chars[c].width() * scale;
dest.h = ts.chars[c].height() * scale;
ts.chars[c].draw(renderer, nullptr, &dest);
x += (ts.chars[c].advance >> 6) * scale;
}
}