From: Michael Georgoulopoulos <mgeorgoulopoulos@gmail.com>
Date: Thu, 1 Sep 2016 20:29:00 +0000 (+0300)
Subject: Load and display background image for "galaxy rise" effect
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dosdemo;a=commitdiff_plain;h=ba3f8e36f9c564d7f1000ccfb78dc63a5a291f5f

Load and display background image for "galaxy rise" effect
---

diff --git a/src/mike.c b/src/mike.c
index f985886..719121e 100644
--- a/src/mike.c
+++ b/src/mike.c
@@ -7,12 +7,20 @@
 #include "demo.h"
 #include "screen.h"
 
+#define BG_FILENAME "data/grise.png"
+
 static int init(void);
 static void destroy(void);
 static void start(long trans_time);
 static void stop(long trans_time);
 static void draw(void);
 
+static void convert32To16(unsigned int *src32, unsigned short *dst16, unsigned int pixelCount);
+
+static unsigned short *background = 0;
+static unsigned int backgroundW = 0;
+static unsigned int backgroundH = 0;
+
 static struct screen scr = {
 	"mike",
 	init,
@@ -30,25 +38,29 @@ struct screen *mike_screen(void)
 
 static int init(void)
 {
+	if (!(background = img_load_pixels(BG_FILENAME, &backgroundW, &backgroundH, IMG_FMT_RGBA32))) {
+		fprintf(stderr, "failed to load image " BG_FILENAME "\n");
+		return -1;
+	}
+
+	/* Convert to 16bpp */
+	convert32To16((unsigned int*)background, background, backgroundW * backgroundH);
+
 	return 0;
 }
 
 static void destroy(void)
 {
+	img_free_pixels(background);
 }
 
 static void start(long trans_time)
 {
-	if(trans_time) {
-		
-	}
+
 }
 
 static void stop(long trans_time)
 {
-	if(trans_time) {
-
-	}
 }
 
 static void draw(void)
@@ -58,9 +70,23 @@ static void draw(void)
 	int j, i;
 	for (j = 0; j < fb_height; j++) {
 		for (i = 0; i < fb_width; i++) {
-			*pixels++ = 0xF800;
+			*pixels++ = 0x0000;
 		}
 	}
+
+	memcpy(fb_pixels, background, backgroundW * backgroundH * 2);
+}
+
+/* src and dst can be the same */
+static void convert32To16(unsigned int *src32, unsigned short *dst16, unsigned int pixelCount) {
+	unsigned int p;
+	while (pixelCount) {
+		p = *src32++;
+		*dst16++ =	((p << 8) & 0xF800)		/* R */
+			|		((p >> 5) & 0x07E0)		/* G */
+			|		((p >> 19) & 0x001F);	/* B */
+		pixelCount--;
+	}
 }