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Changes to fonts automatically update text objects using them.
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Also added the ability to update text object properties (engine, font, text, etc.) dynamically at runtime.
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@slouken
slouken committed Oct 2, 2024
1 parent eed3670 commit 6b5e9a2
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Showing 8 changed files with 932 additions and 231 deletions.
151 changes: 124 additions & 27 deletions examples/showfont.c
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Original file line number Diff line number Diff line change
Expand Up @@ -60,6 +60,7 @@ typedef struct {
SDL_FRect messageRect;
TextEngine textEngine;
TTF_Text *text;
SDL_FRect textRect;
} Scene;

static void draw_scene(Scene *scene)
Expand All @@ -70,29 +71,25 @@ static void draw_scene(Scene *scene)
SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
SDL_RenderClear(renderer);

/* Flush the renderer so we can draw to the window surface in TextEngineSurface mode */
SDL_FlushRenderer(renderer);

if (scene->text) {
int i;
int w, h;

SDL_GetRenderOutputSize(renderer, &w, &h);

for (i = 0; i < 100; ++i) {
int x = SDL_rand(w) - scene->text->w / 2;
int y = SDL_rand(h) - scene->text->h / 2;

switch (scene->textEngine) {
case TextEngineSurface:
TTF_DrawSurfaceText(scene->text, x, y, scene->window_surface);
break;
case TextEngineRenderer:
TTF_DrawRendererText(scene->text, (float)x, (float)y);
break;
default:
break;
}
float x = scene->textRect.x + 4.0f;
float y = scene->textRect.y + 4.0f;

/* Clear the text rect to light gray */
SDL_SetRenderDrawColor(renderer, 0xCC, 0xCC, 0xCC, 0xFF);
SDL_RenderFillRect(renderer, &scene->textRect);

switch (scene->textEngine) {
case TextEngineSurface:
/* Flush the renderer so we can draw directly to the window surface */
SDL_FlushRenderer(renderer);
TTF_DrawSurfaceText(scene->text, (int)x, (int)y, scene->window_surface);
break;
case TextEngineRenderer:
TTF_DrawRendererText(scene->text, x, y);
break;
default:
break;
}
}

Expand Down Expand Up @@ -394,11 +391,12 @@ int main(int argc, char *argv[])
break;
}
if (engine) {
if (wrap) {
scene.text = TTF_CreateText_Wrapped(engine, font, message, 0, 0);
} else {
scene.text = TTF_CreateText(engine, font, message, 0);
}
scene.textRect.x = 8.0f;
scene.textRect.y = scene.captionRect.y + scene.captionRect.h + 4.0f;
scene.textRect.w = WIDTH / 2 - scene.textRect.x * 2;
scene.textRect.h = scene.messageRect.y - scene.textRect.y - 16.0f;

scene.text = TTF_CreateText_Wrapped(engine, font, message, 0, (int)scene.textRect.w);
if (scene.text) {
scene.text->color.r = forecol->r / 255.0f;
scene.text->color.g = forecol->g / 255.0f;
Expand All @@ -420,6 +418,105 @@ int main(int argc, char *argv[])
break;

case SDL_EVENT_KEY_DOWN:
switch (event.key.key) {
case SDLK_B:
/* Toggle bold style */
{
int style = TTF_GetFontStyle(font);
if (style & TTF_STYLE_BOLD) {
style &= ~TTF_STYLE_BOLD;
} else {
style |= TTF_STYLE_BOLD;
}
TTF_SetFontStyle(font, style);
}
break;
case SDLK_C:
/* Copy to clipboard */
if (event.key.mod & SDL_KMOD_CTRL) {
if (scene.text) {
SDL_SetClipboardText(scene.text->text);
}
}
break;
case SDLK_I:
/* Toggle italic style */
{
int style = TTF_GetFontStyle(font);
if (style & TTF_STYLE_ITALIC) {
style &= ~TTF_STYLE_ITALIC;
} else {
style |= TTF_STYLE_ITALIC;
}
TTF_SetFontStyle(font, style);
}
break;
case SDLK_O:
/* Toggle font outline */
{
int outline = TTF_GetFontOutline(font);
if (outline) {
outline = 0;
} else {
outline = 1;
}
TTF_SetFontOutline(font, outline);
}
break;
case SDLK_S:
/* Toggle strike-through style */
{
int style = TTF_GetFontStyle(font);
if (style & TTF_STYLE_STRIKETHROUGH) {
style &= ~TTF_STYLE_STRIKETHROUGH;
} else {
style |= TTF_STYLE_STRIKETHROUGH;
}
TTF_SetFontStyle(font, style);
}
break;
case SDLK_U:
/* Toggle underline style */
{
int style = TTF_GetFontStyle(font);
if (style & TTF_STYLE_UNDERLINE) {
style &= ~TTF_STYLE_UNDERLINE;
} else {
style |= TTF_STYLE_UNDERLINE;
}
TTF_SetFontStyle(font, style);
}
break;
case SDLK_V:
/* Paste from clipboard */
if (event.key.mod & SDL_KMOD_CTRL) {
if (scene.text) {
TTF_SetTextString(scene.text, SDL_GetClipboardText(), 0);
}
}
break;
case SDLK_UP:
/* Increase font size */
{
float ptsize = TTF_GetFontSize(font);
TTF_SetFontSize(font, ptsize + 2.0f);
}
break;
case SDLK_DOWN:
/* Decrease font size */
{
float ptsize = TTF_GetFontSize(font);
TTF_SetFontSize(font, ptsize - 2.0f);
}
break;
case SDLK_ESCAPE:
done = 1;
break;
default:
break;
}
break;

case SDL_EVENT_QUIT:
done = 1;
break;
Expand Down
4 changes: 1 addition & 3 deletions include/SDL3_ttf/SDL_textengine.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -133,11 +133,9 @@ struct TTF_TextEngine
* All fields of `text` except `internal->engine_text` will already be filled out.
*
* \param userdata the userdata pointer in this interface.
* \param font the font being used.
* \param font_generation the unique ID of the font generation being used. This changes whenever the font changes size or style and needs new glyphs, and is unique across all fonts.
* \param text the text object being created.
*/
bool (SDLCALL *CreateText)(void *userdata, TTF_Font *font, Uint32 font_generation, TTF_Text *text);
bool (SDLCALL *CreateText)(void *userdata, TTF_Text *text);

/**
* Destroy a text representation.
Expand Down
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