LibGfx: Move all image loaders and writers to a subdirectory

Userland/Libraries/LibGfx/ImageFormats/PGMLoader.cpp

@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2020, Hüseyin ASLITÜRK <asliturk@hotmail.com>
+ * Copyright (c) 2022, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Endian.h>
+#include <LibGfx/ImageFormats/PGMLoader.h>
+#include <LibGfx/ImageFormats/PortableImageLoaderCommon.h>
+#include <LibGfx/Streamer.h>
+#include <string.h>
+
+namespace Gfx {
+
+static void set_adjusted_pixels(PGMLoadingContext& context, Vector<Gfx::Color> const& color_data)
+{
+    size_t index = 0;
+    for (size_t y = 0; y < context.height; ++y) {
+        for (size_t x = 0; x < context.width; ++x) {
+            Color color = color_data.at(index);
+            if (context.format_details.max_val < 255) {
+                color = adjust_color(context.format_details.max_val, color);
+            }
+            context.bitmap->set_pixel(x, y, color);
+            ++index;
+        }
+    }
+}
+
+bool read_image_data(PGMLoadingContext& context, Streamer& streamer)
+{
+    Vector<Gfx::Color> color_data;
+
+    if (context.type == PGMLoadingContext::Type::ASCII) {
+        u16 value;
+
+        while (true) {
+            if (!read_number(streamer, &value))
+                break;
+
+            if (!read_whitespace(context, streamer))
+                break;
+
+            color_data.append({ (u8)value, (u8)value, (u8)value });
+        }
+    } else if (context.type == PGMLoadingContext::Type::RAWBITS) {
+        u8 pixel;
+        while (streamer.read(pixel)) {
+            color_data.append({ pixel, pixel, pixel });
+        }
+    }
+
+    size_t context_size = (u32)context.width * (u32)context.height;
+    if (context_size != color_data.size()) {
+        dbgln("Not enough color data in image.");
+        return false;
+    }
+
+    if (!create_bitmap(context))
+        return false;
+
+    set_adjusted_pixels(context, color_data);
+
+    context.state = PGMLoadingContext::State::Bitmap;
+    return true;
+}
+}