mirror of
https://github.com/libretro/RetroArch
synced 2025-02-28 12:40:23 +00:00
(Lakka) Integrate png_texture_load.c code into disp/lakka.c
This commit is contained in:
twinaphex
parent
50ff38195a
commit
e447c654ad
2
Makefile
2
Makefile
@ -104,7 +104,7 @@ ifeq ($(HAVE_RGUI), 1)
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DEFINES += -DHAVE_MENU
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HAVE_MENU_COMMON = 1
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ifeq ($(HAVE_LAKKA), 1)
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OBJ += frontend/menu/disp/png_texture_load.o frontend/menu/backend/menu_lakka_backend.o frontend/menu/disp/lakka.o
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OBJ += frontend/menu/backend/menu_lakka_backend.o frontend/menu/disp/lakka.o
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DEFINES += -DHAVE_LAKKA
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LIBS += -lpng
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endif
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@ -41,7 +41,7 @@
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#include "../../../gfx/fonts/bitmap.h"
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#include "lakka.h"
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#include "png_texture_load.h"
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#include <png.h>
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#define HSPACING 300
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#define VSPACING 75
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@ -812,6 +812,161 @@ static void lakka_frame(void *data)
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gl_set_viewport(gl, gl->win_width, gl->win_height, false, false);
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}
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// thanks to https://github.com/DavidEGrayson/ahrs-visualizer/blob/master/png_texture.cpp
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static GLuint png_texture_load(const char * file_name, int * width, int * height)
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{
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png_byte header[8];
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FILE *fp = fopen(file_name, "rb");
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if (fp == 0)
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{
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perror(file_name);
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return 0;
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}
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// read the header
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fread(header, 1, 8, fp);
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if (png_sig_cmp(header, 0, 8))
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{
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fprintf(stderr, "error: %s is not a PNG.\n", file_name);
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fclose(fp);
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return 0;
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}
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png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (!png_ptr)
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{
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fprintf(stderr, "error: png_create_read_struct returned 0.\n");
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fclose(fp);
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return 0;
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}
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// create png info struct
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png_infop info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr)
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{
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fprintf(stderr, "error: png_create_info_struct returned 0.\n");
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png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
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fclose(fp);
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return 0;
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}
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// create png info struct
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png_infop end_info = png_create_info_struct(png_ptr);
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if (!end_info)
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{
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fprintf(stderr, "error: png_create_info_struct returned 0.\n");
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png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
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fclose(fp);
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return 0;
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}
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// the code in this if statement gets called if libpng encounters an error
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if (setjmp(png_jmpbuf(png_ptr))) {
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fprintf(stderr, "error from libpng\n");
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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fclose(fp);
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return 0;
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}
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// init png reading
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png_init_io(png_ptr, fp);
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// let libpng know you already read the first 8 bytes
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png_set_sig_bytes(png_ptr, 8);
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// read all the info up to the image data
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png_read_info(png_ptr, info_ptr);
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// variables to pass to get info
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int bit_depth, color_type;
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png_uint_32 temp_width, temp_height;
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// get info about png
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png_get_IHDR(png_ptr, info_ptr, &temp_width, &temp_height, &bit_depth, &color_type,
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NULL, NULL, NULL);
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if (width){ *width = temp_width; }
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if (height){ *height = temp_height; }
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//printf("%s: %lux%lu %d\n", file_name, temp_width, temp_height, color_type);
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if (bit_depth != 8)
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{
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fprintf(stderr, "%s: Unsupported bit depth %d. Must be 8.\n", file_name, bit_depth);
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return 0;
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}
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GLint format;
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switch(color_type)
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{
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case PNG_COLOR_TYPE_RGB:
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format = GL_RGB;
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break;
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case PNG_COLOR_TYPE_RGB_ALPHA:
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format = GL_RGBA;
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break;
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default:
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fprintf(stderr, "%s: Unknown libpng color type %d.\n", file_name, color_type);
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return 0;
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}
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// Update the png info struct.
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png_read_update_info(png_ptr, info_ptr);
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// Row size in bytes.
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int rowbytes = png_get_rowbytes(png_ptr, info_ptr);
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// glTexImage2d requires rows to be 4-byte aligned
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rowbytes += 3 - ((rowbytes-1) % 4);
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// Allocate the image_data as a big block, to be given to opengl
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png_byte * image_data = (png_byte *)malloc(rowbytes * temp_height * sizeof(png_byte)+15);
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if (image_data == NULL)
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{
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fprintf(stderr, "error: could not allocate memory for PNG image data\n");
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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fclose(fp);
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return 0;
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}
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// row_pointers is for pointing to image_data for reading the png with libpng
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png_byte ** row_pointers = (png_byte **)malloc(temp_height * sizeof(png_byte *));
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if (row_pointers == NULL)
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{
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fprintf(stderr, "error: could not allocate memory for PNG row pointers\n");
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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free(image_data);
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fclose(fp);
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return 0;
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}
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// set the individual row_pointers to point at the correct offsets of image_data
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for (unsigned int i = 0; i < temp_height; i++)
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{
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row_pointers[temp_height - 1 - i] = image_data + i * rowbytes;
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}
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// read the png into image_data through row_pointers
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png_read_image(png_ptr, row_pointers);
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// Generate the OpenGL texture object
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GLuint texture;
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexImage2D(GL_TEXTURE_2D, 0, format, temp_width, temp_height, 0, format, GL_UNSIGNED_BYTE, image_data);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// clean up
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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free(image_data);
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free(row_pointers);
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fclose(fp);
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return texture;
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}
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static void lakka_init_assets(void *data)
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{
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char path[256], dirpath[256];;
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@ -1,172 +0,0 @@
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/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2013 - Hans-Kristian Arntzen
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* Copyright (C) 2011-2013 - Daniel De Matteis
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "png_texture_load.h"
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// thanks to https://github.com/DavidEGrayson/ahrs-visualizer/blob/master/png_texture.cpp
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GLuint png_texture_load(const char * file_name, int * width, int * height)
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{
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png_byte header[8];
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FILE *fp = fopen(file_name, "rb");
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if (fp == 0)
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{
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perror(file_name);
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return 0;
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}
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// read the header
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fread(header, 1, 8, fp);
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if (png_sig_cmp(header, 0, 8))
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{
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fprintf(stderr, "error: %s is not a PNG.\n", file_name);
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fclose(fp);
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return 0;
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}
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png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
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if (!png_ptr)
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{
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fprintf(stderr, "error: png_create_read_struct returned 0.\n");
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fclose(fp);
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return 0;
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}
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// create png info struct
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png_infop info_ptr = png_create_info_struct(png_ptr);
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if (!info_ptr)
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{
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fprintf(stderr, "error: png_create_info_struct returned 0.\n");
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png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
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fclose(fp);
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return 0;
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}
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// create png info struct
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png_infop end_info = png_create_info_struct(png_ptr);
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if (!end_info)
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{
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fprintf(stderr, "error: png_create_info_struct returned 0.\n");
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png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp) NULL);
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fclose(fp);
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return 0;
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}
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// the code in this if statement gets called if libpng encounters an error
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if (setjmp(png_jmpbuf(png_ptr))) {
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fprintf(stderr, "error from libpng\n");
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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fclose(fp);
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return 0;
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}
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// init png reading
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png_init_io(png_ptr, fp);
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// let libpng know you already read the first 8 bytes
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png_set_sig_bytes(png_ptr, 8);
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// read all the info up to the image data
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png_read_info(png_ptr, info_ptr);
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// variables to pass to get info
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int bit_depth, color_type;
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png_uint_32 temp_width, temp_height;
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// get info about png
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png_get_IHDR(png_ptr, info_ptr, &temp_width, &temp_height, &bit_depth, &color_type,
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NULL, NULL, NULL);
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if (width){ *width = temp_width; }
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if (height){ *height = temp_height; }
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//printf("%s: %lux%lu %d\n", file_name, temp_width, temp_height, color_type);
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if (bit_depth != 8)
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{
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fprintf(stderr, "%s: Unsupported bit depth %d. Must be 8.\n", file_name, bit_depth);
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return 0;
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}
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GLint format;
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switch(color_type)
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{
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case PNG_COLOR_TYPE_RGB:
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format = GL_RGB;
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break;
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case PNG_COLOR_TYPE_RGB_ALPHA:
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format = GL_RGBA;
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break;
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default:
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fprintf(stderr, "%s: Unknown libpng color type %d.\n", file_name, color_type);
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return 0;
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}
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// Update the png info struct.
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png_read_update_info(png_ptr, info_ptr);
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// Row size in bytes.
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int rowbytes = png_get_rowbytes(png_ptr, info_ptr);
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// glTexImage2d requires rows to be 4-byte aligned
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rowbytes += 3 - ((rowbytes-1) % 4);
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// Allocate the image_data as a big block, to be given to opengl
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png_byte * image_data = (png_byte *)malloc(rowbytes * temp_height * sizeof(png_byte)+15);
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if (image_data == NULL)
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{
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fprintf(stderr, "error: could not allocate memory for PNG image data\n");
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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fclose(fp);
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return 0;
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}
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// row_pointers is for pointing to image_data for reading the png with libpng
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png_byte ** row_pointers = (png_byte **)malloc(temp_height * sizeof(png_byte *));
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if (row_pointers == NULL)
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{
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fprintf(stderr, "error: could not allocate memory for PNG row pointers\n");
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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free(image_data);
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fclose(fp);
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return 0;
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}
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// set the individual row_pointers to point at the correct offsets of image_data
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for (unsigned int i = 0; i < temp_height; i++)
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{
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row_pointers[temp_height - 1 - i] = image_data + i * rowbytes;
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}
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// read the png into image_data through row_pointers
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png_read_image(png_ptr, row_pointers);
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// Generate the OpenGL texture object
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GLuint texture;
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glGenTextures(1, &texture);
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glBindTexture(GL_TEXTURE_2D, texture);
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glTexImage2D(GL_TEXTURE_2D, 0, format, temp_width, temp_height, 0, format, GL_UNSIGNED_BYTE, image_data);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// clean up
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png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
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free(image_data);
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free(row_pointers);
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fclose(fp);
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return texture;
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}
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@ -1,21 +0,0 @@
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/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2013 - Hans-Kristian Arntzen
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* Copyright (C) 2011-2013 - Daniel De Matteis
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "../../../gfx/gl_common.h"
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#include "../../../gfx/gfx_common.h"
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#include <png.h>
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GLuint png_texture_load(const char *, int *, int *);
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