Save_PRG() supports C64 hires bitmap mode

src/c64formats.c

@@ -1161,15 +1161,17 @@ static int Save_C64_window(enum c64_format *saveFormat, byte *saveWhat, word *lo
   return button==1;
 }
 
-/// Save a C64 hires picture
+
-///
+/**
-/// c64 hires is 320x200 with only 2 colors per 8x8 block.
+ * Encode a C64 HiRes Bitmap picture.
-static int Save_C64_hires(T_IO_Context *context, byte saveWhat, word loadAddr)
+ * 320x200 pixels, with only 2 different colors per 8x8 block.
+ *
+ * 8000 bytes bitmap, 1000 bytes screen RAM
+ */
+static int Encode_C64_hires(T_IO_Context * context, byte * bitmap, byte * screen_ram)
 {
   int i, pos = 0;
   word cx, cy, x, y;
-  byte screen_ram[1000],bitmap[8000];
-  FILE *file;
 
   for(cy=0; cy<25; cy++) // Character line, 25 lines
   {
@@ -1246,7 +1248,21 @@ static int Save_C64_hires(T_IO_Context *context, byte saveWhat, word loadAddr)
       }
     }
   }
+  return 0;
+}
 
+/// Save a C64 hires picture
+///
+/// c64 hires is 320x200 with only 2 colors per 8x8 block.
+static int Save_C64_hires(T_IO_Context *context, byte saveWhat, word loadAddr)
+{
+  byte screen_ram[1000],bitmap[8000];
+  FILE *file;
+  int ret;
+
+  ret = Encode_C64_hires(context, bitmap, screen_ram);
+  if (ret != 0)
+    return ret;
   file = Open_file_write(context);
 
   if(!file)
@@ -1722,7 +1738,17 @@ void Save_PRG(T_IO_Context * context)
   saveFormat = (context->Width == 320) ? F_hires : F_multi;
   File_error = 1;
   Set_saving_layer(context, 0);
+  switch (saveFormat)
+  {
+    case F_hires:
+      File_error = Encode_C64_hires(context, bitmap, screen_ram);
+      break;
+    case F_multi:
       File_error = Encode_C64_multicolor(context, bitmap, screen_ram, color_ram, &background);
+      break;
+    default:
+      GFX2_Log(GFX2_ERROR, "Save_PRG(): format %d not handled (yet?)\n", saveFormat);
+  }
   if (File_error == 0)
   {
     FILE *file;
@@ -1736,7 +1762,7 @@ void Save_PRG(T_IO_Context * context)
     }
     if (!Write_bytes(file, picview_prg, sizeof(picview_prg)))
       File_error = 2;
-    Write_byte(file, 0x30); // Mode : Bitmap + Multicolor
+    Write_byte(file, saveFormat == F_multi ? 0x30 : 0x20); // Mode : 0x40 Extended bg, 0x20 Bitmap, 0x10 Multicolor
     n = PackBits_pack_buffer(NULL, bitmap, 8000);
     GFX2_Log(GFX2_DEBUG, "PackBits of bitmap : 8000 => %d bytes\n", n + 1);
     if (n >= 0 && n < 7999)
@@ -1764,6 +1790,8 @@ void Save_PRG(T_IO_Context * context)
       Write_byte(file, 0x20); // screen RAM / no packing
       Write_bytes(file, screen_ram, 1000);
     }
+    if (saveFormat == F_multi)
+    {
       //Write_byte(file, 0x30); // color RAM / no packing
       //Write_bytes(file, color_ram, 1000);
       Write_byte(file, 0x32); // color RAM / special color RAM packing
@@ -1771,8 +1799,10 @@ void Save_PRG(T_IO_Context * context)
       if (n < 0)
         File_error = 1;
       GFX2_Log(GFX2_DEBUG, "custom packing of color RAM : 1000 => %d bytes\n", n);
+
       Write_byte(file, 0x42); // border/background/etc. / color ram RLE packing
       Write_byte(file, background | 0x10);
+    }
     Write_byte(file, 0); // end of file
     fclose(file);
   }

src/tests/testformats.c

@@ -404,11 +404,12 @@ ret:
 
 int Test_C64_Formats(void)
 {
-  int i;
+  int i, j;
   int ok = 0;
   T_IO_Context context;
   char path[256];
   T_GFX2_Surface * testpicmulti = NULL;
+  T_GFX2_Surface * testpichires = NULL;
 
   memset(&context, 0, sizeof(context));
   context.Type = CONTEXT_SURFACE;
@@ -424,6 +425,16 @@ int Test_C64_Formats(void)
   }
   testpicmulti = context.Surface;
   context.Surface = NULL;
+  // Load a hires picture
+  context_set_file_path(&context, "../tests/pic-samples/c64/hires/midear.dd");
+  Load_C64(&context);
+  if (File_error != 0)
+  {
+    fprintf(stderr, "Failed to load reference hires picture\n");
+    goto ret;
+  }
+  testpichires = context.Surface;
+  context.Surface = NULL;
 
   ok = 1;
   for (i = 0; ok && formats[i].name != NULL; i++)
@@ -433,16 +444,29 @@ int Test_C64_Formats(void)
     if (!(formats[i].flags & FLAG_C64))
       continue;
     GFX2_Log(GFX2_DEBUG, "Testing format %s (Save)\n", formats[i].name);
-    snprintf(path, sizeof(path), "/tmp/%s.%s", "test", formats[i].name);
+    for (j = 0; j < 2; j++)
+    {
+      T_GFX2_Surface * ref;
+
+      if (j == 0)
+      {
+        ref = testpicmulti;
+        context.Ratio = PIXEL_WIDE;
+      }
+      else
+      {
+        ref = testpichires;
+        context.Ratio = PIXEL_SIMPLE;
+      }
+      snprintf(path, sizeof(path), "/tmp/%s-%d.%s", "test", j, formats[i].name);
       context_set_file_path(&context, path);
 
       // save the reference picture
-    context.Surface = testpicmulti;
+      context.Surface = ref;
       context.Target_address = context.Surface->pixels;
       context.Pitch = context.Surface->w;
       context.Width = context.Surface->w;
       context.Height = context.Surface->h;
-    context.Ratio = PIXEL_WIDE;
       memcpy(context.Palette, context.Surface->palette, sizeof(T_Palette));
       context.Format = formats[i].format;
       File_error = 0;
@@ -484,7 +508,7 @@ int Test_C64_Formats(void)
         }
         else
         {
-        if (memcmp(testpicmulti->pixels, context.Surface->pixels, 160*200) != 0)
+          if (memcmp(ref->pixels, context.Surface->pixels, ref->w * ref->h) != 0)
           {
             GFX2_Log(GFX2_ERROR, "Save_%s/Load_%s: Pixels mismatch\n", formats[i].name, formats[i].name);
             ok = 0;
@@ -494,9 +518,12 @@ int Test_C64_Formats(void)
         }
       }
     }
+  }
 ret:
   if (testpicmulti)
     Free_GFX2_Surface(testpicmulti);
+  if (testpichires)
+    Free_GFX2_Surface(testpichires);
   free(context.File_name);
   free(context.File_directory);
   return ok;