feat: add canvas prototype

src/main.c

@@ -3,6 +3,7 @@
 #include "stdlib.h"
 
 #include "./ui/uicontroller.h"
+#include "./ui/vektorcanvas.h"
 
 
 static void on_map(GtkWidget* window, gpointer user_data) {
@@ -14,6 +15,12 @@ static void activate(GtkApplication *app, gpointer user_data) {
   VektorWidgetState* widget_state = (VektorWidgetState*)malloc(sizeof(VektorWidgetState));
   vektor_uictrl_init(app, widget_state);
 
+  VektorCanvas* canvas = (VektorCanvas*)malloc(sizeof(VektorCanvas));
+  vektor_canvas_init(widget_state, canvas);
+  VektorCanvasColor red = vektor_color_new(255, 0, 0, 255);
+  vektor_canvas_fill(canvas, &red);
+  vektor_canvas_update(canvas);
+
   g_signal_connect(widget_state->window, "map", G_CALLBACK(on_map), widget_state);
 
   gtk_window_present(widget_state->window);

src/ui/uicontroller.c

@@ -14,6 +14,7 @@ void vektor_uictrl_init(GtkApplication* app, VektorWidgetState* stateOut) {
 
     stateOut->window = GTK_WINDOW(gtk_builder_get_object(builder, "main_window"));
     stateOut->workspacePaned = GTK_PANED(gtk_builder_get_object(builder, "workspace_paned"));
+    stateOut->workspaceCanvas = GTK_PICTURE(gtk_builder_get_object(builder, "workspace"));
 
     gtk_window_set_application(stateOut->window, app);
     gtk_window_set_title(stateOut->window, "Vektor");

src/ui/uicontroller.h

@@ -9,8 +9,9 @@ all the widgets used in internal logic of the program
 */
 typedef struct VektorWidgetState {
     GtkWindow* window;
-
     GtkPaned* workspacePaned;
+    GtkPicture* workspaceCanvas;
+    
     //GtkWidget* Workspace
 } VektorWidgetState;
 

src/ui/vektorcanvas.c

@@ -0,0 +1,65 @@
+#include "gtk/gtk.h"
+
+#include "vektorcanvas.h"
+#include "uicontroller.h"
+
+#define VKTR_CANVAS_WIDTH 400
+#define VKTR_CANVAS_HEIGHT 400
+#define VKTR_CANVAS_SIZE (VKTR_CANVAS_WIDTH * VKTR_CANVAS_HEIGHT * 4)
+
+void vektor_canvas_init(VektorWidgetState* state, VektorCanvas* canvasOut) {
+    canvasOut->canvasWidget = state->workspaceCanvas;
+    canvasOut->width = VKTR_CANVAS_WIDTH;
+    canvasOut->height = VKTR_CANVAS_HEIGHT;
+    canvasOut->canvasPixels = g_malloc0(VKTR_CANVAS_SIZE);
+
+    canvasOut->canvasPixelBytes = g_bytes_new(canvasOut->canvasPixels, VKTR_CANVAS_SIZE);
+    canvasOut->canvasTexture = gdk_memory_texture_new(
+        VKTR_CANVAS_WIDTH,
+        VKTR_CANVAS_HEIGHT,
+        GDK_MEMORY_R8G8B8A8,
+        canvasOut->canvasPixelBytes,
+        VKTR_CANVAS_WIDTH * 4
+    );
+
+    gtk_picture_set_paintable(canvasOut->canvasWidget, GDK_PAINTABLE(canvasOut->canvasTexture));
+
+    //g_object_unref(bytes);
+}
+
+void vektor_canvas_update(VektorCanvas* canvas) {
+    g_bytes_unref(canvas->canvasPixelBytes);
+    canvas->canvasPixelBytes = g_bytes_new(canvas->canvasPixels, VKTR_CANVAS_SIZE);
+
+    g_object_unref(canvas->canvasTexture);
+    canvas->canvasTexture = gdk_memory_texture_new(
+        canvas->width, canvas->height,
+        GDK_MEMORY_R8G8B8A8,
+        canvas->canvasPixelBytes,
+        canvas->width * 4
+    );
+
+    gtk_picture_set_paintable(canvas->canvasWidget, GDK_PAINTABLE(canvas->canvasTexture));
+}
+
+void vektor_canvas_fill(VektorCanvas* canvas, VektorCanvasColor* color) {
+    for(int x = 0; x < VKTR_CANVAS_WIDTH; x++) {
+        for(int y = 0; y < VKTR_CANVAS_HEIGHT; y++) {
+            int i = (y * VKTR_CANVAS_WIDTH + x) * 4;
+            canvas->canvasPixels[i+0] = color->r;
+            canvas->canvasPixels[i+1] = color->g;
+            canvas->canvasPixels[i+2] = color->b;
+            canvas->canvasPixels[i+3] = color->a;
+        }
+    }
+}
+
+VektorCanvasColor vektor_color_new(guchar cr, guchar cg, guchar cb, guchar ca) {
+    VektorCanvasColor c = {
+        .r = cr,
+        .g = cg,
+        .b = cb,
+        .a = ca
+    };
+    return c;
+}

src/ui/vektorcanvas.h

@@ -0,0 +1,31 @@
+#ifndef VKTR_CANVAS_H
+#define VKTR_CANVAS_H
+
+#include "uicontroller.h"
+
+typedef struct VektorCanvas {
+    GtkPicture* canvasWidget;
+
+    // texture related stuff
+    guchar* canvasPixels;
+    GdkTexture* canvasTexture;
+    GBytes* canvasPixelBytes;
+
+    int width;
+    int height;
+} VektorCanvas;
+
+typedef struct VektorCanvasColor {
+    guchar r;
+    guchar g;
+    guchar b;
+    guchar a;
+} VektorCanvasColor;
+
+void vektor_canvas_init(VektorWidgetState* state, VektorCanvas* canvasOut);
+void vektor_canvas_update(VektorCanvas* canvas);
+void vektor_canvas_fill(VektorCanvas* canvas, VektorCanvasColor* color);
+
+VektorCanvasColor vektor_color_new(guchar r, guchar g, guchar b, guchar a);
+
+#endif