shithub: microui

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reduce the amount of unneeded redraws by checking if commands got updated

--- a/demo/plan9.c

+++ b/demo/plan9.c

@@ -26,6 +26,8 @@

 	mu_Command *cmd;

 	mu_Context *ctx;

 	Biobuf *snarf;

+	char *oldcmds;

+	int oldcmdsidx;

 	USED(argc); USED(argv);

@@ -44,30 +46,34 @@

 	threadsetname("microui demo");

 	ctx = malloc(sizeof(mu_Context));

-	r_init();

-

-	/* init microui */

 	mu_init(ctx);

 	ctx->text_width = r_get_text_width;

 	ctx->text_height = r_get_text_height;

 	ctx->style->font = display->defaultfont;

+	r_init();

 	process_frame(ctx);

 	oldbuttons = 0;

+	oldcmds = malloc(sizeof(ctx->command_list.items));

+	oldcmdsidx = -1;

 	for (;;) {

 		process_frame(ctx);

-		cmd = nil;

-		r_clear(mu_color(bg[0], bg[1], bg[2], 255));

-		while (mu_next_command(ctx, &cmd)) {

-			switch (cmd->type) {

-			case MU_COMMAND_TEXT: r_draw_text(ctx->style->font, cmd->text.str, cmd->text.pos, cmd->text.color); break;

-			case MU_COMMAND_RECT: r_draw_rect(cmd->rect.rect, cmd->rect.color); break;

-			case MU_COMMAND_ICON: r_draw_icon(cmd->icon.id, cmd->icon.rect, cmd->icon.color); break;

-			case MU_COMMAND_CLIP: r_set_clip_rect(cmd->clip.rect); break;

+		if (oldcmdsidx != ctx->command_list.idx || memcmp(oldcmds, ctx->command_list.items, oldcmdsidx) != 0) {

+			oldcmdsidx = ctx->command_list.idx;

+			memmove(oldcmds, ctx->command_list.items, oldcmdsidx);

+			cmd = nil;

+			r_clear(mu_color(bg[0], bg[1], bg[2], 255));

+			while (mu_next_command(ctx, &cmd)) {

+				switch (cmd->type) {

+				case MU_COMMAND_TEXT: r_draw_text(ctx->style->font, cmd->text.str, cmd->text.pos, cmd->text.color); break;

+				case MU_COMMAND_RECT: r_draw_rect(cmd->rect.rect, cmd->rect.color); break;

+				case MU_COMMAND_ICON: r_draw_icon(cmd->icon.id, cmd->icon.rect, cmd->icon.color); break;

+				case MU_COMMAND_CLIP: r_set_clip_rect(cmd->clip.rect); break;

+				}

 			}

+			r_present();

 		}

-		r_present();

 		gotevent = 1;

 		switch (alt(a)) {