From cc13becc46ab2f42a2e784ed798c979243b35d17 Mon Sep 17 00:00:00 2001
From: Kirill Primak <vyivel@eclair.cafe>
Date: Tue, 18 Jun 2024 19:01:51 +0300
Subject: [PATCH] Drop cairo

---
 main.c      | 60 ++++++++++++++++++++++++++++++++++++++---------------
 meson.build |  2 --
 2 files changed, 43 insertions(+), 19 deletions(-)

diff --git a/main.c b/main.c
index 71eb5e8..6353630 100644
--- a/main.c
+++ b/main.c
@@ -1,5 +1,4 @@
 #include <assert.h>
-#include <cairo.h>
 #include <fcntl.h>
 #include <linux/input-event-codes.h>
 #include <pixman.h>
@@ -24,8 +23,7 @@
 struct dp_swapchain_buffer {
 	struct wl_buffer *buffer;
 	void *data;
-	cairo_surface_t *cairo_surface;
-	cairo_t *cairo;
+	pixman_image_t *image;
 	bool used;
 };
 
@@ -104,6 +102,10 @@ static int pointer_y = 0;
 
 static bool quick = false;
 
+static pixman_image_t *unselected_fill_image = NULL;
+static pixman_image_t *selected_fill_image = NULL;
+static pixman_image_t *border_fill_image = NULL;
+
 static void die(const char *fmt, ...) {
 	va_list args;
 	va_start(args, fmt);
@@ -227,23 +229,29 @@ static void redraw(struct dp_output *output) {
 	}
 	sc_buffer->used = true;
 
-	cairo_set_operator(sc_buffer->cairo, CAIRO_OPERATOR_SOURCE);
-
-	cairo_set_source_rgba(sc_buffer->cairo, 0.5, 0.5, 0.5, 0.5);
-	cairo_paint(sc_buffer->cairo);
+	pixman_image_composite32(PIXMAN_OP_SRC, unselected_fill_image, NULL, sc_buffer->image, 0, 0, 0,
+			0, 0, 0, output->px_width, output->px_height);
 
 	if (output == selected_output) {
-		cairo_rectangle(sc_buffer->cairo, selected_x, selected_y, selected_width, selected_height);
-		cairo_set_line_width(sc_buffer->cairo, 4);
+		int border_size = 2;
 
-		cairo_set_source_rgba(sc_buffer->cairo, 1.0, 1.0, 1.0, 1.0);
-		cairo_stroke_preserve(sc_buffer->cairo);
-		cairo_set_source_rgba(sc_buffer->cairo, 0.0, 0.0, 0.0, 0.0);
-		cairo_fill(sc_buffer->cairo);
+		pixman_image_composite32(PIXMAN_OP_SRC, border_fill_image, NULL, sc_buffer->image, 0, 0, 0,
+				0, selected_x - border_size, selected_y - border_size,
+				selected_width + border_size * 2, border_size);
+		pixman_image_composite32(PIXMAN_OP_SRC, border_fill_image, NULL, sc_buffer->image, 0, 0, 0,
+				0, selected_x - border_size, selected_y + selected_height,
+				selected_width + border_size * 2, border_size);
+		pixman_image_composite32(PIXMAN_OP_SRC, border_fill_image, NULL, sc_buffer->image, 0, 0, 0,
+				0, selected_x - border_size, selected_y, border_size, selected_height);
+		pixman_image_composite32(PIXMAN_OP_SRC, border_fill_image, NULL, sc_buffer->image, 0, 0, 0,
+				0, selected_x + selected_width, selected_y, border_size, selected_height);
+
+		pixman_image_composite32(PIXMAN_OP_SRC, selected_fill_image, NULL, sc_buffer->image, 0, 0,
+				0, 0, selected_x, selected_y, selected_width, selected_height);
 	}
 
 	wl_surface_attach(output->ui_surface, sc_buffer->buffer, 0, 0);
-	wl_surface_damage(output->ui_surface, 0, 0, 200000000, 200000000);
+	wl_surface_damage(output->ui_surface, 0, 0, output->px_width, output->px_height);
 	wl_surface_commit(output->ui_surface);
 }
 
@@ -734,9 +742,8 @@ int main(void) {
 			int stride = output->frame_width * 4;
 			sc_buffer->buffer = create_buffer(output->px_width, output->px_height, stride,
 					WL_SHM_FORMAT_ARGB8888, &sc_buffer->data);
-			sc_buffer->cairo_surface = cairo_image_surface_create_for_data(sc_buffer->data,
-					CAIRO_FORMAT_ARGB32, output->px_width, output->px_height, stride);
-			sc_buffer->cairo = cairo_create(sc_buffer->cairo_surface);
+			sc_buffer->image = pixman_image_create_bits(
+					PIXMAN_a8r8g8b8, output->px_width, output->px_height, sc_buffer->data, stride);
 
 			wl_buffer_add_listener(sc_buffer->buffer, &sc_buffer_listener, sc_buffer);
 		}
@@ -750,6 +757,25 @@ int main(void) {
 		}
 	}
 
+	unselected_fill_image = pixman_image_create_solid_fill(&(pixman_color_t){
+		.red = UINT16_MAX / 2,
+		.green = UINT16_MAX / 2,
+		.blue = UINT16_MAX / 2,
+		.alpha = UINT16_MAX / 2,
+	});
+	selected_fill_image = pixman_image_create_solid_fill(&(pixman_color_t){
+		.red = 0,
+		.green = 0,
+		.blue = 0,
+		.alpha = 0,
+	});
+	border_fill_image = pixman_image_create_solid_fill(&(pixman_color_t){
+		.red = UINT16_MAX,
+		.green = UINT16_MAX,
+		.blue = UINT16_MAX,
+		.alpha = UINT16_MAX,
+	});
+
 	// Select the "first" output, whatever that is
 	selected_output = wl_container_of(outputs.next, selected_output, link);
 	select_whole();
diff --git a/meson.build b/meson.build
index dd69fee..92be204 100644
--- a/meson.build
+++ b/meson.build
@@ -43,7 +43,6 @@ add_project_arguments(cc.get_supported_arguments([
 wayland_client = dependency('wayland-client')
 wayland_protos = dependency('wayland-protocols')
 
-cairo = dependency('cairo')
 pixman = dependency('pixman-1')
 xkbcommon = dependency('xkbcommon')
 
@@ -59,7 +58,6 @@ executable(
   dependencies: [
     client_protos,
     wayland_client,
-    cairo,
     pixman,
     xkbcommon,
   ],