libretro, add Pico pad overlay and storyware pages handling

platform/libretro/libretro-common/include/formats/rpng.h

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+/* Copyright  (C) 2010-2020 The RetroArch team
+ *
+ * ---------------------------------------------------------------------------------------
+ * The following license statement only applies to this file (rpng.h).
+ * ---------------------------------------------------------------------------------------
+ *
+ * Permission is hereby granted, free of charge,
+ * to any person obtaining a copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __LIBRETRO_SDK_FORMAT_RPNG_H__
+#define __LIBRETRO_SDK_FORMAT_RPNG_H__
+
+#include <stdint.h>
+#include <stddef.h>
+
+#include <retro_common_api.h>
+
+#include <boolean.h>
+
+RETRO_BEGIN_DECLS
+
+typedef struct rpng rpng_t;
+
+rpng_t *rpng_init(const char *path);
+
+bool rpng_is_valid(rpng_t *rpng);
+
+bool rpng_set_buf_ptr(rpng_t *rpng, void *data, size_t len);
+
+rpng_t *rpng_alloc(void);
+
+void rpng_free(rpng_t *rpng);
+
+bool rpng_iterate_image(rpng_t *rpng);
+
+int rpng_process_image(rpng_t *rpng,
+      void **data, size_t size, unsigned *width, unsigned *height);
+
+bool rpng_start(rpng_t *rpng);
+
+bool rpng_save_image_argb(const char *path, const uint32_t *data,
+      unsigned width, unsigned height, unsigned pitch);
+bool rpng_save_image_bgr24(const char *path, const uint8_t *data,
+      unsigned width, unsigned height, unsigned pitch);
+
+uint8_t* rpng_save_image_bgr24_string(const uint8_t *data,
+      unsigned width, unsigned height, signed pitch, uint64_t *bytes);
+
+RETRO_END_DECLS
+
+#endif