ADDED: example: text_codepoints_loading

examples/text/resources/DotGothic16-Regular_OFL.txt

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+Copyright 2020 The DotGothic16 Project Authors (https://github.com/fontworks-fonts/DotGothic16)
+
+This Font Software is licensed under the SIL Open Font License, Version 1.1.
+This license is copied below, and is also available with a FAQ at:
+http://scripts.sil.org/OFL
+
+
+-----------------------------------------------------------
+SIL OPEN FONT LICENSE Version 1.1 - 26 February 2007
+-----------------------------------------------------------
+
+PREAMBLE
+The goals of the Open Font License (OFL) are to stimulate worldwide
+development of collaborative font projects, to support the font creation
+efforts of academic and linguistic communities, and to provide a free and
+open framework in which fonts may be shared and improved in partnership
+with others.
+
+The OFL allows the licensed fonts to be used, studied, modified and
+redistributed freely as long as they are not sold by themselves. The
+fonts, including any derivative works, can be bundled, embedded, 
+redistributed and/or sold with any software provided that any reserved
+names are not used by derivative works. The fonts and derivatives,
+however, cannot be released under any other type of license. The
+requirement for fonts to remain under this license does not apply
+to any document created using the fonts or their derivatives.
+
+DEFINITIONS
+"Font Software" refers to the set of files released by the Copyright
+Holder(s) under this license and clearly marked as such. This may
+include source files, build scripts and documentation.
+
+"Reserved Font Name" refers to any names specified as such after the
+copyright statement(s).
+
+"Original Version" refers to the collection of Font Software components as
+distributed by the Copyright Holder(s).
+
+"Modified Version" refers to any derivative made by adding to, deleting,
+or substituting -- in part or in whole -- any of the components of the
+Original Version, by changing formats or by porting the Font Software to a
+new environment.
+
+"Author" refers to any designer, engineer, programmer, technical
+writer or other person who contributed to the Font Software.
+
+PERMISSION & CONDITIONS
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of the Font Software, to use, study, copy, merge, embed, modify,
+redistribute, and sell modified and unmodified copies of the Font
+Software, subject to the following conditions:
+
+1) Neither the Font Software nor any of its individual components,
+in Original or Modified Versions, may be sold by itself.
+
+2) Original or Modified Versions of the Font Software may be bundled,
+redistributed and/or sold with any software, provided that each copy
+contains the above copyright notice and this license. These can be
+included either as stand-alone text files, human-readable headers or
+in the appropriate machine-readable metadata fields within text or
+binary files as long as those fields can be easily viewed by the user.
+
+3) No Modified Version of the Font Software may use the Reserved Font
+Name(s) unless explicit written permission is granted by the corresponding
+Copyright Holder. This restriction only applies to the primary font name as
+presented to the users.
+
+4) The name(s) of the Copyright Holder(s) or the Author(s) of the Font
+Software shall not be used to promote, endorse or advertise any
+Modified Version, except to acknowledge the contribution(s) of the
+Copyright Holder(s) and the Author(s) or with their explicit written
+permission.
+
+5) The Font Software, modified or unmodified, in part or in whole,
+must be distributed entirely under this license, and must not be
+distributed under any other license. The requirement for fonts to
+remain under this license does not apply to any document created
+using the Font Software.
+
+TERMINATION
+This license becomes null and void if any of the above conditions are
+not met.
+
+DISCLAIMER
+THE FONT SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
+OF COPYRIGHT, PATENT, TRADEMARK, OR OTHER RIGHT. IN NO EVENT SHALL THE
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+INCLUDING ANY GENERAL, SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL
+DAMAGES, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF THE USE OR INABILITY TO USE THE FONT SOFTWARE OR FROM
+OTHER DEALINGS IN THE FONT SOFTWARE.

examples/text/text_codepoints_loading.c

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+/*******************************************************************************************
+*
+*   raylib [text] example - Codepoints loading
+*
+*   This example has been created using raylib 4.2 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2022 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#include <stdlib.h>         // Required for: calloc(), realloc(), free()
+#include <string.h>         // Required for: memcpy()
+
+// Text to be displayed, must be UTF-8 (save this code file as UTF-8)
+// NOTE: It can contain all the required text for the game,
+// this text will be scanned to get all the required codepoints
+static char *text = "いろはにほへと　ちりぬるを\nわかよたれそ　つねならむ\nうゐのおくやま　けふこえて\nあさきゆめみし　ゑひもせす";
+
+// Remove codepoint duplicates if requested
+static int *CodepointRemoveDuplicates(int *codepoints, int codepointCount, int *codepointResultCount);
+
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [text] example - codepoints loading");
+    
+    // Get codepoints from text
+    int codepointCount = 0;
+    int *codepoints = LoadCodepoints(text, &codepointCount);
+    
+    // Removed duplicate codepoints to generate smaller font atlas
+    int codepointsNoDupsCount = 0;
+    int *codepointsNoDups = CodepointRemoveDuplicates(codepoints, codepointCount, &codepointsNoDupsCount);
+    UnloadCodepoints(codepoints);
+
+    // Load font containing all the provided codepoint glyphs
+    // A texture font atlas is automatically generated
+    Font font = LoadFontEx("resources/DotGothic16-Regular.ttf", 36, codepointsNoDups, codepointsNoDupsCount);
+    
+    // Set bilinear scale filter for better font scaling
+    SetTextureFilter(font.texture, TEXTURE_FILTER_BILINEAR);
+
+    // Free codepoints, atlas has already been generated
+    free(codepointsNoDups);
+   
+    bool showFontAtlas = false;
+
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        if (IsKeyPressed(KEY_SPACE)) showFontAtlas = !showFontAtlas;
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+            
+            DrawRectangle(0, 0, GetScreenWidth(), 70, BLACK);
+            DrawText(TextFormat("Total codepoints contained in provided text: %i", codepointCount), 10, 10, 20, GREEN);
+            DrawText(TextFormat("Total codepoints required for font atlas (duplicates excluded): %i", codepointsNoDupsCount), 10, 40, 20, GREEN);
+
+            if (showFontAtlas)
+            {
+                // Draw generated font texture atlas containing provided codepoints
+                DrawTexture(font.texture, 150, 100, BLACK);
+                DrawRectangleLines(150, 100, font.texture.width, font.texture.height, BLACK);
+            }
+            else
+            {
+                // Draw provided text with laoded font, containing all required codepoint glyphs
+                DrawTextEx(font, text, (Vector2) { 160, 110 }, 48, 5, BLACK);
+            }
+            
+            DrawText("Press SPACE to toggle font atlas view!", 10, GetScreenHeight() - 30, 20, GRAY);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+    
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadFont(font);     // Unload font
+    
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+    
+    return 0;
+}
+
+// Remove codepoint duplicates if requested
+// WARNING: This process could be a bit slow if there text to process is very long
+static int *CodepointRemoveDuplicates(int *codepoints, int codepointCount, int *codepointsResultCount)
+{
+    int codepointsNoDupsCount = codepointCount;
+    int *codepointsNoDups = (int *)calloc(codepointCount, sizeof(int));
+    memcpy(codepointsNoDups, codepoints, codepointCount*sizeof(int));
+
+    // Remove duplicates
+    for (int i = 0; i < codepointsNoDupsCount; i++)
+    {
+        for (int j = i + 1; j < codepointsNoDupsCount; j++)
+        {
+            if (codepointsNoDups[i] == codepointsNoDups[j])
+            {
+                for (int k = j; k < codepointsNoDupsCount; k++) codepointsNoDups[k] = codepointsNoDups[k + 1];
+
+                codepointsNoDupsCount--;
+                j--;
+            }
+        }
+    }
+
+    // NOTE: The size of codepointsNoDups is the same as original array but 
+    // only required positions are filled (codepointsNoDupsCount)
+    
+    *codepointsResultCount = codepointsNoDupsCount;
+    return codepointsNoDups;
+}