l4re-base-25.08.0

src/l4/pkg/examples/libs/libpng/Makefile

@@ -0,0 +1,9 @@
+PKGDIR		?= ..
+L4DIR		?= $(PKGDIR)/../../..
+
+TARGET		= ex_libpng
+SRC_C		= main.c
+REQUIRES_LIBS   = libl4png_wrap l4re_c-util
+DEPENDS_PKGS    = $(REQUIRES_LIBS)
+
+include $(L4DIR)/mk/prog.mk

src/l4/pkg/examples/libs/libpng/main.c

@@ -0,0 +1,80 @@
+#include <l4/re/c/util/cap_alloc.h>
+#include <l4/re/c/util/video/goos_fb.h>
+#include <l4/libpng/l4png_wrap.h>
+#include <l4/util/util.h>
+
+#include <sys/mman.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+int main(int argc, char **argv)
+{
+  void *bildmem;
+  void *vidmem;
+  l4re_util_video_goos_fb_t gfb;
+  l4re_video_view_info_t fbi;
+
+  if (argc < 2)
+    {
+      printf("Need to give PNG picture to display\n");
+      return 1;
+    }
+
+  if (l4re_util_video_goos_fb_setup_name(&gfb, "fb"))
+    return 45;
+
+  if (!(vidmem = l4re_util_video_goos_fb_attach_buffer(&gfb)))
+    return 46;
+
+  printf("size: %lld\n", l4re_ds_size(l4re_util_video_goos_fb_buffer(&gfb)));
+  printf("Vidmem attached to %p\n", vidmem);
+
+  if (l4re_util_video_goos_fb_view_info(&gfb, &fbi))
+    {
+      printf("l4re_fb_open failed\n");
+      return 1;
+    }
+
+  int bild = open(argv[1], O_RDONLY);
+  if (bild == -1)
+    {
+      printf("Could not open '%s'.\n", argv[1]);
+      perror("open");
+      return 8;
+    }
+
+  struct stat st;
+  if (fstat(bild, &st) == -1)
+    return 9;
+
+  bildmem = mmap(0, st.st_size, PROT_READ, MAP_SHARED, bild, 0);
+  if (bildmem == MAP_FAILED)
+    return 10;
+
+  int png_w, png_h;
+  libpng_get_size_mem(bildmem, st.st_size, &png_w, &png_h);
+
+  printf("PNG: %dx%d\n", png_w, png_h);
+
+  if (png_w < 0 || png_h < 0)
+    {
+      printf("Error with picture. Is it one?\n");
+      return 1;
+    }
+
+  libpng_render_mem2(bildmem, (void *)vidmem,
+                     st.st_size,
+                     l4re_ds_size(l4re_util_video_goos_fb_buffer(&gfb)),
+                     ((int)fbi.width - png_w) / 2,
+                     ((int)fbi.height - png_h) / 2,
+                     &fbi);
+
+  l4re_util_video_goos_fb_refresh(&gfb, 0, 0, png_w, png_h);
+
+  l4_sleep_forever();
+
+  return 0;
+}