3 #include <lib/gdi/epng.h>
6 int loadPNG(ePtr<gPixmap> &result, const char *filename)
9 FILE *fp=fopen(filename, "rb");
13 // eDebug("couldn't open %s", filename );
16 if (!fread(header, 8, 1, fp))
18 eDebug("couldn't read");
22 if (png_sig_cmp(header, 0, 8))
27 png_structp png_ptr=png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
34 png_infop info_ptr=png_create_info_struct(png_ptr);
37 eDebug("no info ptr");
38 png_destroy_read_struct(&png_ptr, (png_infopp)0, (png_infopp)0);
42 png_infop end_info = png_create_info_struct(png_ptr);
46 png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
50 if (setjmp(png_ptr->jmpbuf))
52 eDebug("das war wohl nix");
53 png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
58 png_init_io(png_ptr, fp);
59 png_set_sig_bytes(png_ptr, 8);
60 png_set_invert_alpha(png_ptr);
61 png_read_info(png_ptr, info_ptr);
63 png_uint_32 width, height;
67 png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, 0, 0, 0);
69 // eDebug("%s: %dx%dx%d png, %d", filename, (int)width, (int)height, (int)bit_depth, color_type);
73 result=new gPixmap(eSize(width, height), bit_depth);
74 gSurface *surface = result->surface;
76 png_bytep *rowptr=new png_bytep[height];
78 for (unsigned int i=0; i<height; i++)
79 rowptr[i]=((png_byte*)(surface->data))+i*surface->stride;
80 png_read_rows(png_ptr, rowptr, 0, height);
84 if (png_get_valid(png_ptr, info_ptr, PNG_INFO_PLTE))
88 png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);
90 surface->clut.data=new gRGB[num_palette];
93 surface->clut.colors=num_palette;
95 for (int i=0; i<num_palette; i++)
97 surface->clut.data[i].a=0;
98 surface->clut.data[i].r=palette[i].red;
99 surface->clut.data[i].g=palette[i].green;
100 surface->clut.data[i].b=palette[i].blue;
102 if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
105 png_get_tRNS(png_ptr, info_ptr, &trans, &num_palette, 0);
106 for (int i=0; i<num_palette; i++)
107 surface->clut.data[i].a=255-trans[i];
111 surface->clut.data=0;
112 surface->clut.colors=0;
114 png_read_end(png_ptr, end_info);
118 png_destroy_read_struct(&png_ptr, &info_ptr,&end_info);
123 int savePNG(const char *filename, gPixmap *pixmap)
125 FILE *fp=fopen(filename, "wb");
129 gSurface *surface = pixmap->surface;
133 png_structp png_ptr=png_create_write_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
136 eDebug("write png, couldnt allocate write struct");
141 png_infop info_ptr=png_create_info_struct(png_ptr);
145 png_destroy_write_struct(&png_ptr, 0);
150 if (setjmp(png_ptr->jmpbuf))
153 png_destroy_write_struct(&png_ptr, &info_ptr);
158 png_init_io(png_ptr, fp);
159 png_set_filter(png_ptr, 0, PNG_FILTER_NONE|PNG_FILTER_SUB|PNG_FILTER_PAETH);
160 png_set_compression_level(png_ptr, Z_BEST_COMPRESSION);
162 png_set_IHDR(png_ptr, info_ptr, surface->x, surface->y, surface->bpp,
163 surface->clut.data ? PNG_COLOR_TYPE_PALETTE : PNG_COLOR_TYPE_GRAY,
164 PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
165 if (surface->clut.data)
167 png_color palette[surface->clut.colors];
168 png_byte trans[surface->clut.colors];
169 for (int i=0; i<surface->clut.colors; ++i)
171 palette[i].red=surface->clut.data[i].r;
172 palette[i].green=surface->clut.data[i].g;
173 palette[i].blue=surface->clut.data[i].b;
174 trans[i]=255-surface->clut.data[i].a;
176 png_set_PLTE(png_ptr, info_ptr, palette, surface->clut.colors);
177 png_set_tRNS(png_ptr, info_ptr, trans, surface->clut.colors, 0);
179 png_write_info(png_ptr, info_ptr);
180 png_set_packing(png_ptr);
181 png_byte *row_pointers[surface->y];
182 for (int i=0; i<surface->y; ++i)
183 row_pointers[i]=((png_byte*)surface->data)+i*surface->stride;
184 png_write_image(png_ptr, row_pointers);
185 png_write_end(png_ptr, info_ptr);
186 png_destroy_write_struct(&png_ptr, &info_ptr);
188 eDebug("wrote png ! fine !");