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--- src/main.cpp.orig 2019-11-13 08:52:44 UTC
+++ src/main.cpp
@@ -13,6 +13,7 @@
#include "viewer.h"
#include <GLFW/glfw3.h>
+#include <png.h>
#include <clocale>
#include <cstdio>
@@ -148,6 +149,64 @@ namespace
::printf("(EE) GLFW error (%d) '%s'\n", e, error);
}
+ // Based on https://gist.github.com/niw/5963798
+ void load_png_icon(const char *filename, GLFWimage *icon)
+ {
+ png_byte color_type;
+ png_byte bit_depth;
+
+ FILE *fp = fopen(filename, "rb");
+ if (!fp) return;
+
+ png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+ if (!png) return;
+ png_infop info = png_create_info_struct(png);
+ if (!info) return;
+ if (setjmp(png_jmpbuf(png))) return;
+
+ png_init_io(png, fp);
+ png_read_info(png, info);
+
+ icon->width = png_get_image_width(png, info);
+ icon->height = png_get_image_height(png, info);
+ color_type = png_get_color_type(png, info);
+ bit_depth = png_get_bit_depth(png, info);
+
+ // Read any color_type into 8bit depth, RGBA format.
+ // See http://www.libpng.org/pub/png/libpng-manual.txt
+ if (bit_depth == 16)
+ png_set_strip_16(png);
+ if (color_type == PNG_COLOR_TYPE_PALETTE)
+ png_set_palette_to_rgb(png);
+ // PNG_COLOR_TYPE_GRAY_ALPHA is always 8 or 16 bit depth.
+ if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
+ png_set_expand_gray_1_2_4_to_8(png);
+ if (png_get_valid(png, info, PNG_INFO_tRNS))
+ png_set_tRNS_to_alpha(png);
+ // These color_type don't have an alpha channel then fill it with 0xFF.
+ if (color_type == PNG_COLOR_TYPE_RGB ||
+ color_type == PNG_COLOR_TYPE_GRAY ||
+ color_type == PNG_COLOR_TYPE_PALETTE)
+ png_set_filler(png, 0xFF, PNG_FILLER_AFTER);
+ if (color_type == PNG_COLOR_TYPE_GRAY ||
+ color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
+ png_set_gray_to_rgb(png);
+ png_read_update_info(png, info);
+
+ // Allocate contiguous memory region; caller has to delete[].
+ icon->pixels = new unsigned char[icon->width * icon->height * 4];
+
+ auto *row_pointers = new png_bytep[icon->height];
+ png_byte bpr = png_get_rowbytes(png, info);
+ for (int y = 0; y < icon->height; y++)
+ row_pointers[y] = icon->pixels + y * bpr;
+
+ png_read_image(png, row_pointers);
+ delete[] row_pointers;
+ png_destroy_read_struct(&png, &info, NULL);
+ fclose(fp);
+ }
+
void setup(GLFWwindow* window)
{
glfwMakeContextCurrent(window);
@@ -173,6 +232,18 @@ namespace
#if GLFW_VERSION_MAJOR >= 3 && GLFW_VERSION_MINOR >= 1
glfwSetDropCallback(window, callbackDrop);
#endif
+
+ GLFWimage icons[3];
+
+ load_png_icon("%%DATADIR%%/Icon-1024.png", &icons[0]);
+ load_png_icon("%%DATADIR%%/Icon-32.png", &icons[1]);
+ load_png_icon("%%DATADIR%%/Icon-16.png", &icons[2]);
+
+ glfwSetWindowIcon(window, 3, icons);
+
+ delete[] icons[2].pixels;
+ delete[] icons[1].pixels;
+ delete[] icons[0].pixels;
}
GLFWwindow* createWindowedWindow(int width, int height, GLFWwindow* parent, const sConfig& config)
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