diff --git a/lua/CMakeLists.txt b/lua/CMakeLists.txt index 09a12fb4..378c0553 100644 --- a/lua/CMakeLists.txt +++ b/lua/CMakeLists.txt @@ -63,6 +63,17 @@ if(BUILD_LUA_RSVG) set(lua_libs ${lua_libs} conky-rsvg) endif(BUILD_LUA_RSVG) +if(BUILD_LUA_CAIRO AND BUILD_LUA_IMLIB2) + include_directories(${luacairo_includes} ${luaimlib2_includes} ${CMAKE_CURRENT_SOURCE_DIR}) + wrap_tolua(luacairo_imlib2_helper_src cairo_imlib2_helper.pkg) + + add_library(conky-cairo_imlib2_helper SHARED ${luacairo_imlib2_helper_src}) + set_target_properties(conky-cairo_imlib2_helper PROPERTIES OUTPUT_NAME "cairo_imlib2_helper") + + target_link_libraries(conky-cairo_imlib2_helper ${luacairo_libs} ${luaimlib2_libs} ${TOLUA_LIBS}) + set(lua_libs ${lua_libs} conky-cairo_imlib2_helper) +endif(BUILD_LUA_CAIRO AND BUILD_LUA_IMLIB2) + install(TARGETS ${lua_libs} LIBRARY DESTINATION lib/conky diff --git a/lua/cairo_imlib2_helper.pkg b/lua/cairo_imlib2_helper.pkg new file mode 100644 index 00000000..610173a8 --- /dev/null +++ b/lua/cairo_imlib2_helper.pkg @@ -0,0 +1,5 @@ +$#include +$#include + +void cairo_draw_image(const char *, cairo_surface_t *, int, int, double, double, + double * return_scale_w, double * return_scale_h); diff --git a/lua/libcairo_imlib2_helper.h b/lua/libcairo_imlib2_helper.h new file mode 100644 index 00000000..85ff9977 --- /dev/null +++ b/lua/libcairo_imlib2_helper.h @@ -0,0 +1,79 @@ +/* -*- mode: c; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*- + * + * Conky, a system monitor, based on torsmo + * + * Please see COPYING for details + * + * Copyright (c) 2005-2012 Brenden Matthews, Philip Kovacs, et. al. + * (see AUTHORS) + * All rights reserved. + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + * + */ + +#ifndef _LIBCAIRO_IMAGE_HELPER_H_ +#define _LIBCAIRO_IMAGE_HELPER_H_ + +#include +#include + +void +cairo_draw_image(const char * file, cairo_surface_t * cs, int x, int y, + double scale_x, double scale_y, + double * return_scale_w, double * return_scale_h) +{ + Imlib_Image * image = imlib_load_image(file); + if (! image) { return; } + + imlib_context_set_image(image); + int w = imlib_image_get_width(), h = imlib_image_get_height(); + + double scaled_w = *return_scale_w = scale_x * (double)w + , scaled_h = *return_scale_h = scale_y * (double)h; + + /* create temporary image */ + Imlib_Image premul = imlib_create_image(scaled_w, scaled_h); + /* FIXME: add error handling */ + + /* fill with opaque black */ + imlib_context_set_image(premul); + imlib_context_set_color(0, 0, 0, 255); + imlib_image_fill_rectangle(0, 0, scaled_w, scaled_h); + + /* blend source image on top - + * in effect this multiplies the rgb values by alpha */ + imlib_blend_image_onto_image(image, 0, 0, 0, w, h, 0, 0, scaled_w, scaled_h); + + /* and use the alpha channel of the source image */ + imlib_image_copy_alpha_to_image(image, 0, 0); + + /* now pass the result to cairo */ + cairo_surface_t * result = cairo_image_surface_create_for_data( + (void *) imlib_image_get_data_for_reading_only(), + CAIRO_FORMAT_ARGB32, scaled_w, scaled_h, sizeof(DATA32) * scaled_w); + + cairo_t * cr = cairo_create(cs); + cairo_set_source_surface(cr, result, x, y); + cairo_paint(cr); + + imlib_context_set_image(image); + imlib_free_image(); + imlib_context_set_image(premul); + imlib_free_image(); + + cairo_destroy(cr); + cairo_surface_destroy(result); +} + +#endif /* _LIBCAIRO_IMAGE_HELPER_H_ */