libakgl/src/text.c

/**
 * @file text.c
 * @brief Implements the text subsystem.
 */

#include <akerror.h>
#include <SDL3/SDL.h>
#include <SDL3_ttf/SDL_ttf.h>
#include <akgl/text.h>
#include <akgl/registry.h>
#include <akgl/game.h>

akerr_ErrorContext AKERR_NOIGNORE *akgl_text_loadfont(char *name, char *filepath, int size)
{
    TTF_Font *font = NULL;

    PREPARE_ERROR(errctx);
    FAIL_ZERO_RETURN(errctx, name, AKERR_NULLPOINTER, "Null font name");
    FAIL_ZERO_RETURN(errctx, name, AKERR_NULLPOINTER, "Null filepath");
    font = TTF_OpenFont(filepath, size);
    FAIL_ZERO_RETURN(errctx, font, AKGL_ERR_SDL, "%s", SDL_GetError());
    FAIL_ZERO_RETURN(
	errctx,
	SDL_SetPointerProperty(AKGL_REGISTRY_FONT, name, (void *)font),
	AKERR_KEY,
	"Unable to add font %p to registry as %s : %s",
	(void *)font,
	name,
	SDL_GetError());
    SUCCEED_RETURN(errctx);
}

akerr_ErrorContext AKERR_NOIGNORE *akgl_text_rendertextat(TTF_Font *font, char *text, SDL_Color color, int wraplength, int x, int y)
{
    SDL_Surface *textsurf = NULL;
    SDL_Texture *texture = NULL;
    SDL_FRect dest;

    PREPARE_ERROR(errctx);
    FAIL_ZERO_RETURN(errctx, font, AKERR_NULLPOINTER, "NULL font");
    FAIL_ZERO_RETURN(errctx, text, AKERR_NULLPOINTER, "NULL text string");
    if ( wraplength > 0 ) {
	textsurf = TTF_RenderText_Blended_Wrapped(
	    font,
	    text,
	    0,
	    color,
	    wraplength);
    } else {
	textsurf = TTF_RenderText_Blended(
	    font,
	    text,
	    0,
	    color);
    }
    FAIL_ZERO_RETURN(errctx, textsurf, AKERR_NULLPOINTER, "%s", SDL_GetError());
    texture = SDL_CreateTextureFromSurface(renderer->sdl_renderer, textsurf);
    FAIL_ZERO_RETURN(errctx, texture, AKERR_NULLPOINTER, "%s", SDL_GetError());
    dest.x = x;
    dest.y = y;
    SDL_GetTextureSize(texture, &dest.w, &dest.h);
    PASS(errctx, renderer->draw_texture(renderer, texture, NULL, &dest, 0, NULL, SDL_FLIP_NONE));
    SDL_DestroyTexture(texture);
    SDL_DestroySurface(textsurf);
    SUCCEED_RETURN(errctx);
}