created ImageFromChannel

Adds the possibility to extract a specific channel from an image

examples/textures/textures_image_channel.c

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+/*******************************************************************************************
+*
+*   raylib [textures] example - Retrive image channel (mask)
+*
+*   NOTE: Images are loaded in CPU memory (RAM); textures are loaded in GPU memory (VRAM)
+*
+*   Example originally created with raylib 5.1-dev, last time updated with raylib 5.1-dev
+*
+*   Example contributed by Bruno Cabral (github.com/brccabral) and reviewed by Ramon Santamaria (@raysan5)
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2024-2024 Bruno Cabral (github.com/brccabral) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include <raylib.h>
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+
+    const int screenWidth = 800;
+    const int screenHeight = 612;
+
+    InitWindow(screenWidth, screenHeight, "raylib [textures] example - extract channel from image");
+
+    Image fudesumi_image = LoadImage("resources/fudesumi.png");
+    Texture2D fudesumi_texture = LoadTextureFromImage(fudesumi_image);
+
+    Image image_red = ImageFromChannel(fudesumi_image, 0, 0.0f);
+    Texture2D texture_red = LoadTextureFromImage(image_red);
+    UnloadImage(image_red);
+
+    Image image_green = ImageFromChannel(fudesumi_image, 1, 0.0f);
+    Texture2D texture_green = LoadTextureFromImage(image_green);
+    UnloadImage(image_green);
+
+    Image image_blue = ImageFromChannel(fudesumi_image, 2, 0.0f);
+    Texture2D texture_blue = LoadTextureFromImage(image_blue);
+    UnloadImage(image_blue);
+
+    Image image_alpha = ImageFromChannel(fudesumi_image, 3, 0.0f);
+    Texture2D texture_alpha = LoadTextureFromImage(image_alpha);
+    UnloadImage(image_alpha);
+
+
+    Image background_image = GenImageChecked(screenWidth, screenHeight, screenWidth/20, screenHeight/20, ORANGE, YELLOW);
+    Texture2D background_texture = LoadTextureFromImage(background_image);
+    UnloadImage(background_image);
+
+    SetTargetFPS(60);               // Set our game to run at 60 frames-per-second
+
+    Rectangle fudesumi_rec = {0, 0, fudesumi_image.width, fudesumi_image.height};
+    Rectangle red_pos = { 410, 50, fudesumi_image.width / 2, fudesumi_image.height / 2 };
+    Rectangle green_pos = { 600, 50, fudesumi_image.width / 2, fudesumi_image.height / 2 };
+    Rectangle blue_pos = { 410, 310, fudesumi_image.width / 2, fudesumi_image.height / 2 };
+    Rectangle alpha_pos = { 600, 310, fudesumi_image.width / 2, fudesumi_image.height / 2 };
+
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            DrawTexture(background_texture, 0, 0, WHITE);
+            DrawTexture(fudesumi_texture, 50, 50, WHITE);
+
+            DrawTexturePro(texture_red, fudesumi_rec, red_pos, (Vector2) {0, 0}, 0, RED);
+            DrawTexturePro(texture_green, fudesumi_rec, green_pos, (Vector2) {0, 0}, 0, GREEN);
+            DrawTexturePro(texture_blue, fudesumi_rec, blue_pos, (Vector2) {0, 0}, 0, BLUE);
+            DrawTexturePro(texture_alpha, fudesumi_rec, alpha_pos, (Vector2) {0, 0}, 0, WHITE);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadTexture(background_texture);
+    UnloadImage(fudesumi_image);
+    UnloadTexture(fudesumi_texture);
+    UnloadTexture(texture_red);
+    UnloadTexture(texture_green);
+    UnloadTexture(texture_blue);
+    UnloadTexture(texture_alpha);
+    CloseWindow();        // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}