Atlas - SDL_test_font.c
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[FILE BEGIN]
1/*
2  Simple DirectMedia Layer
3  Copyright (C) 1997-2025 Sam Lantinga <[email protected]>
4
5  This software is provided 'as-is', without any express or implied
6  warranty.  In no event will the authors be held liable for any damages
7  arising from the use of this software.
8
9  Permission is granted to anyone to use this software for any purpose,
10  including commercial applications, and to alter it and redistribute it
11  freely, subject to the following restrictions:
12
13  1. The origin of this software must not be misrepresented; you must not
14     claim that you wrote the original software. If you use this software
15     in a product, an acknowledgment in the product documentation would be
16     appreciated but is not required.
17  2. Altered source versions must be plainly marked as such, and must not be
18     misrepresented as being the original software.
19  3. This notice may not be removed or altered from any source distribution.
20*/
21#include <SDL3/SDL_test.h>
22
23#define UTF8_IsTrailingByte(c) ((c) >= 0x80 && (c) <= 0xBF)
24
25int FONT_CHARACTER_SIZE = SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE;
26
27bool SDLTest_DrawCharacter(SDL_Renderer *renderer, float x, float y, Uint32 c)
28{
29    char str[5];
30    char *ptr = SDL_UCS4ToUTF8(c, str);
31    *ptr = '\0';
32    return SDL_RenderDebugText(renderer, x, y, str);
33}
34
35bool SDLTest_DrawString(SDL_Renderer *renderer, float x, float y, const char *s)
36{
37    return SDL_RenderDebugText(renderer, x, y, s);
38}
39
40SDLTest_TextWindow *SDLTest_TextWindowCreate(float x, float y, float w, float h)
41{
42    SDLTest_TextWindow *textwin = (SDLTest_TextWindow *)SDL_malloc(sizeof(*textwin));
43
44    if (!textwin) {
45        return NULL;
46    }
47
48    textwin->rect.x = x;
49    textwin->rect.y = y;
50    textwin->rect.w = w;
51    textwin->rect.h = h;
52    textwin->current = 0;
53    textwin->numlines = (int)SDL_ceilf(h / FONT_LINE_HEIGHT);
54    textwin->lines = (char **)SDL_calloc(textwin->numlines, sizeof(*textwin->lines));
55    if (!textwin->lines) {
56        SDL_free(textwin);
57        return NULL;
58    }
59    return textwin;
60}
61
62void SDLTest_TextWindowDisplay(SDLTest_TextWindow *textwin, SDL_Renderer *renderer)
63{
64    int i;
65    float y;
66
67    for (y = textwin->rect.y, i = 0; i < textwin->numlines; ++i, y += FONT_LINE_HEIGHT) {
68        if (textwin->lines[i]) {
69            SDLTest_DrawString(renderer, textwin->rect.x, y, textwin->lines[i]);
70        }
71    }
72}
73
74void SDLTest_TextWindowAddText(SDLTest_TextWindow *textwin, const char *fmt, ...)
75{
76    char text[1024];
77    va_list ap;
78
79    va_start(ap, fmt);
80    (void)SDL_vsnprintf(text, sizeof(text), fmt, ap);
81    va_end(ap);
82
83    SDLTest_TextWindowAddTextWithLength(textwin, text, SDL_strlen(text));
84}
85
86void SDLTest_TextWindowAddTextWithLength(SDLTest_TextWindow *textwin, const char *text, size_t len)
87{
88    size_t existing;
89    bool newline = false;
90    char *line;
91
92    if (len > 0 && text[len - 1] == '\n') {
93        --len;
94        newline = true;
95    }
96
97    if (textwin->lines[textwin->current]) {
98        existing = SDL_strlen(textwin->lines[textwin->current]);
99    } else {
100        existing = 0;
101    }
102
103    if (*text == '\b') {
104        if (existing) {
105            while (existing > 1 && UTF8_IsTrailingByte((Uint8)textwin->lines[textwin->current][existing - 1])) {
106                --existing;
107            }
108            --existing;
109            textwin->lines[textwin->current][existing] = '\0';
110        } else if (textwin->current > 0) {
111            SDL_free(textwin->lines[textwin->current]);
112            textwin->lines[textwin->current] = NULL;
113            --textwin->current;
114        }
115        return;
116    }
117
118    line = (char *)SDL_realloc(textwin->lines[textwin->current], existing + len + 1);
119    if (line) {
120        SDL_memcpy(&line[existing], text, len);
121        line[existing + len] = '\0';
122        textwin->lines[textwin->current] = line;
123        if (newline) {
124            if (textwin->current == textwin->numlines - 1) {
125                SDL_free(textwin->lines[0]);
126                SDL_memmove(&textwin->lines[0], &textwin->lines[1], (textwin->numlines - 1) * sizeof(textwin->lines[1]));
127                textwin->lines[textwin->current] = NULL;
128            } else {
129                ++textwin->current;
130            }
131        }
132    }
133}
134
135void SDLTest_TextWindowClear(SDLTest_TextWindow *textwin)
136{
137    int i;
138
139    for (i = 0; i < textwin->numlines; ++i) {
140        if (textwin->lines[i]) {
141            SDL_free(textwin->lines[i]);
142            textwin->lines[i] = NULL;
143        }
144    }
145    textwin->current = 0;
146}
147
148void SDLTest_TextWindowDestroy(SDLTest_TextWindow *textwin)
149{
150    if (textwin) {
151        SDLTest_TextWindowClear(textwin);
152        SDL_free(textwin->lines);
153        SDL_free(textwin);
154    }
155}
156
157void SDLTest_CleanupTextDrawing(void)
158{
159}
160
[FILE END]
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