feat: add canvas prototype

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;
+}