From b4c221326dd986044b74e3dfa98ff2bf3c9485ef Mon Sep 17 00:00:00 2001 From: insofaras Date: Fri, 17 Jun 2016 06:28:05 +0100 Subject: [PATCH] linux freetype font test stuff --- Makefile | 4 +- linux_4ed.cpp | 6 ++ linux_font.cpp | 234 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 242 insertions(+), 2 deletions(-) create mode 100644 linux_font.cpp diff --git a/Makefile b/Makefile index 960b346e..9d356f35 100755 --- a/Makefile +++ b/Makefile @@ -1,8 +1,8 @@ CPP_FILES := $(wildcard *.cpp) $(wildcard **/*.cpp) H_FILES := $(wildcard *.h) $(wildcard **/*.h) WARNINGS := -Wno-write-strings -PLAT_LINKS := -L/usr/local/lib -lX11 -lpthread -lm -lrt -lGL -ldl -lXfixes -FLAGS := -fPIC -fno-threadsafe-statics -pthread -I../foreign +PLAT_LINKS := -L/usr/local/lib -lX11 -lpthread -lm -lrt -lGL -ldl -lXfixes -lfreetype -lfontconfig +FLAGS := -fPIC -fno-threadsafe-statics -pthread -I../foreign $(shell pkg-config --cflags freetype2) debug: FLAGS += -DFRED_INTERNAL=1 -DFRED_SUPER=1 -g -O0 debug: ../4ed_app.so ../4ed diff --git a/linux_4ed.cpp b/linux_4ed.cpp index 815c1270..03f03f54 100644 --- a/linux_4ed.cpp +++ b/linux_4ed.cpp @@ -101,6 +101,7 @@ #endif #define SUPPORT_DPI 1 +#define LINUX_FONTS 1 // // Linux structs / enums @@ -1129,6 +1130,7 @@ INTERNAL_Sys_Debug_Message_Sig(internal_debug_message){ #include "system_shared.cpp" #include "4ed_rendering.cpp" +#include "linux_font.cpp" internal f32 size_change(i32 dpi_x, i32 dpi_y){ @@ -1157,6 +1159,9 @@ Font_Load_Sig(system_draw_font_load){ #endif for(; attempts < 3; ++attempts){ +#if LINUX_FONTS + success = linux_font_load(font_out, filename, pt_size, tab_width); +#else success = draw_font_load( &linuxvars.font_part, font_out, @@ -1166,6 +1171,7 @@ Font_Load_Sig(system_draw_font_load){ oversample, store_texture ); +#endif if(success){ break; diff --git a/linux_font.cpp b/linux_font.cpp new file mode 100644 index 00000000..0c5189aa --- /dev/null +++ b/linux_font.cpp @@ -0,0 +1,234 @@ +#undef internal +#include +#include +#include FT_FREETYPE_H +#include FT_LCD_FILTER_H +#define internal static + +//TODO(inso): put in linuxvars +static FcConfig* fc; + +internal char* +linux_get_sys_font(char* name, i32 pt_size){ + char* result = 0; + + if(!fc){ + fc = FcInitLoadConfigAndFonts(); + } + + FcPattern* pat = FcPatternBuild( + NULL, + FC_POSTSCRIPT_NAME, FcTypeString, name, + FC_SIZE, FcTypeDouble, (double)pt_size, + FC_FONTFORMAT, FcTypeString, "TrueType", + NULL + ); + + FcConfigSubstitute(fc, pat, FcMatchPattern); + FcDefaultSubstitute(pat); + + FcResult res; + FcPattern* font = FcFontMatch(fc, pat, &res); + FcChar8* fname = 0; + + if(font){ + FcPatternGetString(font, FC_FILE, 0, &fname); + if(fname){ + result = strdup((char*)fname); + fprintf(stderr, "Got system font from FontConfig: %s\n", result); + } + FcPatternDestroy(font); + } + + FcPatternDestroy(pat); + + if(!result){ + char space[1024]; + String str = make_fixed_width_string(space); + if(sysshared_to_binary_path(&str, name)){ + result = strdup(space); + } else { + result = strdup(name); + } + } + + return result; +} + +internal u32 +next_pow_of_2(u32 v){ + --v; + v |= v >> 1; + v |= v >> 2; + v |= v >> 4; + v |= v >> 8; + v |= v >> 16; + return ++v; +} + +#define NUM_GLYPHS 128 +#define ENABLE_LCD_FILTER 0 + +internal b32 +linux_font_load(Render_Font *rf, char *name, i32 pt_size, i32 tab_width){ + +#if 0 + char* filename = linux_get_sys_font(name, pt_size); +#else + char* filename = (char*)malloc(256); + String str = make_string(filename, 0, 256); + sysshared_to_binary_path(&str, name); +#endif + + memset(rf, 0, sizeof(*rf)); + + //TODO(inso): put stuff in linuxvars / init in main + FT_Library ft; + FT_Face face; + b32 use_lcd_filter = 0; + + FT_Init_FreeType(&ft); + + //NOTE(inso): i'm not sure the LCD filter looks better, and it doesn't work perfectly with the coloring stuff +#if ENABLE_LCD_FILTER + if(FT_Library_SetLcdFilter(ft, FT_LCD_FILTER_DEFAULT) == 0){ + puts("LCD Filter on"); + use_lcd_filter = 1; + glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA); + } +#endif + + FT_New_Face(ft, filename, 0, &face); + + // set size & metrics + FT_Size_RequestRec_ size = {}; + size.type = FT_SIZE_REQUEST_TYPE_REAL_DIM; + size.height = pt_size << 6; + FT_Request_Size(face, &size); + + rf->loaded = 1; + rf->ascent = face->size->metrics.ascender / 64.0f; + rf->descent = face->size->metrics.descender / 64.0f; + rf->advance = face->size->metrics.max_advance / 64.0f; + rf->height = face->size->metrics.height / 64.0f; + rf->line_skip = rf->height - (rf->ascent - rf->descent); + + int max_glyph_w = face->size->metrics.x_ppem; + int max_glyph_h = rf->height; + int tex_width = 64; + int tex_height = 0; + + // estimate upper bound on texture width + do { + tex_width *= 2; + float glyphs_per_row = ceilf(tex_width / (float) max_glyph_w); + float rows = ceilf(NUM_GLYPHS / glyphs_per_row); + tex_height = rows * (max_glyph_h + 2); + } while(tex_height > tex_width); + + tex_height = next_pow_of_2(tex_height); + + int pen_x = 0; + int pen_y = 0; + + u32* pixels = (u32*) calloc(tex_width * tex_height, sizeof(u32)); + + // XXX: test if AUTOHINT looks better or not + const u32 ft_extra_flags = use_lcd_filter ? FT_LOAD_TARGET_LCD : FT_LOAD_FORCE_AUTOHINT; + + for(int i = 0; i < NUM_GLYPHS; ++i){ + if(FT_Load_Char(face, i, FT_LOAD_RENDER | ft_extra_flags) != 0) continue; + + int w = face->glyph->bitmap.width; + int h = face->glyph->bitmap.rows; + + // lcd filter produces RGB bitmaps, need to account for the extra components + if(use_lcd_filter){ + w /= 3; + } + + // move to next line if necessary + if(pen_x + w >= tex_width){ + pen_x = 0; + pen_y += (max_glyph_h + 2); + } + + // set all this stuff the renderer needs + stbtt_packedchar* c = rf->chardata + i; + + c->x0 = pen_x; + c->y0 = pen_y; + c->x1 = pen_x + w; + c->y1 = pen_y + h + 1; + + c->xoff = face->glyph->bitmap_left; + c->yoff = -face->glyph->bitmap_top; + + c->xoff2 = w + c->xoff; + c->yoff2 = h + c->yoff + 1; + + c->xadvance = face->glyph->advance.x >> 6; + + rf->advance_data[i] = c->xadvance; + rf->glyphs[i].exists = 1; + + + int pitch = face->glyph->bitmap.pitch; + + // write to texture atlas + for(int j = 0; j < h; ++j){ + for(int i = 0; i < w; ++i){ + int x = pen_x + i; + int y = pen_y + j; + + if(use_lcd_filter){ + u8 r = face->glyph->bitmap.buffer[j * pitch + i * 3]; + u8 g = face->glyph->bitmap.buffer[j * pitch + i * 3 + 1]; + u8 b = face->glyph->bitmap.buffer[j * pitch + i * 3 + 2]; + u8 a = (r + g + b) / 3.0f; + + pixels[y * tex_width + x] = (a << 24) | (r << 16) | (g << 8) | b; + } else { + pixels[y * tex_width + x] = face->glyph->bitmap.buffer[j * pitch + i] * 0x1010101; + } + } + } + + pen_x = c->x1 + 1; + } + + rf->chardata['\r'] = rf->chardata[' ']; + rf->chardata['\n'] = rf->chardata[' ']; + rf->chardata['\t'] = rf->chardata[' ']; + rf->chardata['\t'].xadvance *= tab_width; + + FT_Done_FreeType(ft); + + tex_height = next_pow_of_2(pen_y + max_glyph_h + 2); + + rf->tex_width = tex_width; + rf->tex_height = tex_height; + + // upload texture + glGenTextures(1, &rf->tex); + glBindTexture(GL_TEXTURE_2D, rf->tex); + + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0); + + if(use_lcd_filter){ + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, tex_width, tex_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels); + } else { + glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, tex_width, tex_height, 0, GL_ALPHA, GL_UNSIGNED_INT, pixels); + } + + glBindTexture(GL_TEXTURE_2D, 0); + + free(pixels); + free(filename); + + return 1; +}