1 files changed, 90 insertions, 0 deletions
diff --git a/libgui/inc/png.h b/libgui/inc/png.h
new file mode 100644
index 0000000..038a0cb
--- /dev/null
+++ b/libgui/inc/png.h
@@ -0,0 +1,90 @@
+/*
+png -- derived from LodePNG version 20100808
+
+Copyright (c) 2005-2010 Lode Vandevenne
+Copyright (c) 2010 Sean Middleditch
+Copyright (c) 2020 Marvin Borner
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+		1. The origin of this software must not be misrepresented; you must not
+		claim that you wrote the original software. If you use this software
+		in a product, an acknowledgment in the product documentation would be
+		appreciated but is not required.
+		2. Altered source versions must be plainly marked as such, and must not be
+		misrepresented as being the original software.
+		3. This notice may not be removed or altered from any source
+		distribution.
+*/
+
+#ifndef PNG_H
+#define PNG_H
+
+#include <bmp.h>
+#include <def.h>
+
+enum png_error {
+	PNG_EOK = 0, // Success (no error)
+	PNG_ENOMEM = 1, // Memory allocation failed
+	PNG_ENOTFOUND = 2, // Resource not found (file missing)
+	PNG_ENOTPNG = 3, // Image data does not have a PNG header
+	PNG_EMALFORMED = 4, // Image data is not a valid PNG image
+	PNG_EUNSUPPORTED = 5, // Critical PNG chunk type is not supported
+	PNG_EUNINTERLACED = 6, // Image interlacing is not supported
+	PNG_EUNFORMAT = 7, // Image color format is not supported
+	PNG_EPARAM = 8 // Invalid parameter to method call
+};
+
+enum png_format {
+	PNG_BADFORMAT,
+	PNG_RGB8,
+	PNG_RGB16,
+	PNG_RGBA8,
+	PNG_RGBA16,
+	PNG_LUMINANCE1,
+	PNG_LUMINANCE2,
+	PNG_LUMINANCE4,
+	PNG_LUMINANCE8,
+	PNG_LUMINANCE_ALPHA1,
+	PNG_LUMINANCE_ALPHA2,
+	PNG_LUMINANCE_ALPHA4,
+	PNG_LUMINANCE_ALPHA8
+};
+
+enum png_state { PNG_ERROR = -1, PNG_DECODED = 0, PNG_HEADER = 1, PNG_NEW = 2 };
+
+enum png_color { PNG_LUM = 0, PNG_RGB = 2, PNG_LUMA = 4, PNG_RGBA = 6 };
+
+struct png_source {
+	const u8 *buffer;
+	u32 size;
+	char owning;
+};
+
+struct png {
+	u32 width;
+	u32 height;
+
+	enum png_color color_type;
+	u32 color_depth;
+	enum png_format format;
+
+	u8 *buffer;
+	u32 size;
+
+	enum png_error error;
+	u32 error_line;
+
+	enum png_state state;
+	struct png_source source;
+};
+
+struct bmp *png_load(const char *path);
+void png_free(struct png *png);
+u32 png_get_bpp(const struct png *png);
+
+#endif