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741 lines (617 loc) · 20.4 KB
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/*
* image.c - image object
*
* Copyright © 2008-2009 Julien Danjou <julien@danjou.info>
*
* 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 <http://www.gnu.org/licenses/>.
*
*/
#include <xcb/xcb_image.h>
#include <Imlib2.h>
#include "awesome.h"
#include "config.h"
#include "luaa.h"
#include "common/luaobject.h"
#include "common/luaclass_property.h"
struct image
{
LUA_OBJECT_HEADER
/** Imlib2 image */
Imlib_Image image;
/** Image data */
uint8_t *data;
/** Flag telling if the image is up to date or needs computing before
* drawing */
bool isupdated;
};
static void
image_wipe(image_t *image)
{
imlib_context_set_image(image->image);
imlib_free_image();
p_delete(&image->data);
}
static const char *
image_imlib_load_strerror(Imlib_Load_Error e)
{
switch(e)
{
case IMLIB_LOAD_ERROR_FILE_DOES_NOT_EXIST:
return "no such file or directory";
case IMLIB_LOAD_ERROR_FILE_IS_DIRECTORY:
return "file is a directory";
case IMLIB_LOAD_ERROR_PERMISSION_DENIED_TO_READ:
return "read permission denied";
case IMLIB_LOAD_ERROR_NO_LOADER_FOR_FILE_FORMAT:
return "no loader for file format";
case IMLIB_LOAD_ERROR_PATH_TOO_LONG:
return "path too long";
case IMLIB_LOAD_ERROR_PATH_COMPONENT_NON_EXISTANT:
return "path component non existent";
case IMLIB_LOAD_ERROR_PATH_COMPONENT_NOT_DIRECTORY:
return "path component not a directory";
case IMLIB_LOAD_ERROR_PATH_POINTS_OUTSIDE_ADDRESS_SPACE:
return "path points outside address space";
case IMLIB_LOAD_ERROR_TOO_MANY_SYMBOLIC_LINKS:
return "too many symbolic links";
case IMLIB_LOAD_ERROR_OUT_OF_MEMORY:
return "out of memory";
case IMLIB_LOAD_ERROR_OUT_OF_FILE_DESCRIPTORS:
return "out of file descriptors";
case IMLIB_LOAD_ERROR_PERMISSION_DENIED_TO_WRITE:
return "write permission denied";
case IMLIB_LOAD_ERROR_OUT_OF_DISK_SPACE:
return "out of disk space";
case IMLIB_LOAD_ERROR_UNKNOWN:
return "unknown error, that's really bad";
case IMLIB_LOAD_ERROR_NONE:
return "no error, oops";
}
return "unknown error";
}
/** Get image width.
* \param image The image.
* \return The image width in pixel.
*/
int
image_get_width(image_t *image)
{
imlib_context_set_image(image->image);
return imlib_image_get_width();
}
/** Get image height.
* \param image The image.
* \return The image height in pixel.
*/
int
image_get_height(image_t *image)
{
imlib_context_set_image(image->image);
return imlib_image_get_height();
}
/** Get the ARGB32 data from an image.
* \param image The image.
* \return Data.
*/
uint8_t *
image_get_data(image_t *image)
{
int size, i;
uint32_t *data;
double alpha;
uint8_t *dataimg;
#if AWESOME_IS_BIG_ENDIAN
const int index_a = 0, index_r = 1, index_g = 2, index_b = 3;
#else
const int index_a = 3, index_r = 2, index_g = 1, index_b = 0;
#endif
if(image->isupdated)
return image->data;
imlib_context_set_image(image->image);
data = imlib_image_get_data_for_reading_only();
size = imlib_image_get_width() * imlib_image_get_height();
p_realloc(&image->data, size * 4);
dataimg = image->data;
for(i = 0; i < size; i++, dataimg += 4)
{
dataimg[index_a] = (data[i] >> 24) & 0xff; /* A */
/* cairo wants pre-multiplied alpha */
alpha = dataimg[index_a] / 255.0;
dataimg[index_r] = ((data[i] >> 16) & 0xff) * alpha; /* R */
dataimg[index_g] = ((data[i] >> 8) & 0xff) * alpha; /* G */
dataimg[index_b] = (data[i] & 0xff) * alpha; /* B */
}
image->isupdated = true;
return image->data;
}
static void
image_draw_to_1bit_ximage(image_t *image, xcb_image_t *img)
{
imlib_context_set_image(image->image);
uint32_t *data = imlib_image_get_data_for_reading_only();
int width = imlib_image_get_width();
int height = imlib_image_get_height();
for(int y = 0; y < height; y++)
for(int x = 0; x < width; x++)
{
int i, pixel, tmp;
i = y * width + x;
// Sum up all color components ignoring alpha
tmp = (data[i] >> 16) & 0xff;
tmp += (data[i] >> 8) & 0xff;
tmp += data[i] & 0xff;
pixel = (tmp / 3 < 127) ? 0 : 1;
xcb_image_put_pixel(img, x, y, pixel);
}
}
// Convert an image to a 1bit pixmap
#include "screen.h"
xcb_pixmap_t
image_to_1bit_pixmap(image_t *image, xcb_drawable_t d)
{
xcb_pixmap_t pixmap;
xcb_image_t *img;
uint16_t width, height;
width = image_get_width(image);
height = image_get_height(image);
/* Prepare the pixmap and gc */
pixmap = xcb_generate_id(_G_connection);
xcb_create_pixmap(_G_connection, 1, pixmap, d, width, height);
/* Prepare the image */
img = xcb_image_create_native(_G_connection, width, height,
XCB_IMAGE_FORMAT_XY_BITMAP, 1, NULL, 0, NULL);
image_draw_to_1bit_ximage(image, img);
/* Paint the image to the pixmap */
xcb_image_put(_G_connection, pixmap, _G_gc, img, 0, 0, 0);
xcb_image_destroy(img);
return pixmap;
}
/** Create a new image from ARGB32 data.
* \param L The Lua VM state.
* \param width The image width.
* \param height The image height.
* \param data The image data.
* \return 1 if an image has been pushed on stack, 0 otherwise.
*/
int
image_new_from_argb32(lua_State *L, int width, int height, uint32_t *data)
{
Imlib_Image imimage;
if((imimage = imlib_create_image_using_copied_data(width, height, data)))
{
imlib_context_set_image(imimage);
imlib_image_set_has_alpha(true);
image_t *image = (image_t *) luaA_object_new(L, &image_class);
image->image = imimage;
return 1;
}
return 0;
}
/** Create a new, completely black image.
* \param L The Lua VM state.
* \param width The image width.
* \param height The image height.
* \return 1 if an image has been pushed on stack, 0 otherwise.
*/
static int
image_new_blank(lua_State *L, int width, int height)
{
Imlib_Image imimage;
if((imimage = imlib_create_image(width, height)))
{
imlib_context_set_image(imimage);
imlib_image_set_has_alpha(true);
/* After creation, an image has undefined content. Fix that up. */
imlib_context_set_color(0, 0, 0, 0xff);
imlib_image_fill_rectangle(0, 0, width, height);
image_t *image = (image_t *) luaA_object_new(L, &image_class);
image->image = imimage;
return 1;
}
return 0;
}
/** Load an image from filename.
* \param L The Lua VM state.
* \param filename The image file to load.
* \return 1 if image is loaded and on stack, 0 otherwise.
*/
static int
image_new_from_file(lua_State *L, const char *filename)
{
if(!filename)
return 0;
Imlib_Image imimage;
if(!(imimage = imlib_load_image_without_cache(filename)))
{
warn("cannot load image %s", filename);
return 0;
}
image_t *image = (image_t *) luaA_object_new(L, &image_class);
image->image = imimage;
return 1;
}
/** Create a new image object.
* \param L The Lua stack.
* \return The number of elements pushed on stack.
*/
static int
luaA_image_new(lua_State *L)
{
const char *filename;
if((filename = lua_tostring(L, 2)))
return image_new_from_file(L, filename);
return 0;
}
/** Create a new image object from ARGB32 data.
* \param L The Lua stack.
* \return The number of elements pushed on stack.
*/
static int
luaA_image_argb32_new(lua_State *L)
{
size_t len;
unsigned int width = luaL_checknumber(L, 1);
unsigned int height = luaL_checknumber(L, 2);
if (width == 0)
luaL_error(L, "image.argb32() called with zero width");
if (height == 0)
luaL_error(L, "image.argb32() called with zero height");
if(lua_isnil(L, 3))
{
return image_new_blank(L, width, height);
}
const char *data = luaL_checklstring(L, 3, &len);
if(width * height * 4 != len)
luaL_error(L, "string size does not match image size");
return image_new_from_argb32(L, width, height, (uint32_t *) data);
}
/** Performs 90 degree rotations on the current image. Passing 0 orientation
* does not rotate, 1 rotates clockwise by 90 degree, 2, rotates clockwise by
* 180 degrees, 3 rotates clockwise by 270 degrees.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_image_orientate(lua_State *L)
{
image_t *image = luaA_checkudata(L, 1, &image_class);
int orientation = luaL_checknumber(L, 2);
imlib_context_set_image(image->image);
imlib_image_orientate(orientation);
image->isupdated = false;
return 0;
}
/** Rotate an image with specified angle radians and return a new image.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_image_rotate(lua_State *L)
{
image_t *image = luaA_checkudata(L, 1, &image_class);
double angle = luaL_checknumber(L, 2);
image_t *new = (image_t *) luaA_object_new(L, &image_class);
imlib_context_set_image(image->image);
new->image = imlib_create_rotated_image(angle);
return 1;
}
/** Crop an image to the given rectangle.
* \return The number of elements pushed on stack.
*/
static int
luaA_image_crop(lua_State *L)
{
image_t *image = luaA_checkudata(L, 1, &image_class);
int x = luaL_checkint(L, 2);
int y = luaL_checkint(L, 3);
int w = luaL_checkint(L, 4);
int h = luaL_checkint(L, 5);
image_t *new = (image_t *) luaA_object_new(L, &image_class);
imlib_context_set_image(image->image);
new->image = imlib_create_cropped_image(x, y, w, h);
return 1;
}
/** Crop the image to the given rectangle and scales it.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_image_crop_and_scale(lua_State *L)
{
image_t *image = luaA_checkudata(L, 1, &image_class);
int source_x = luaL_checkint(L, 2);
int source_y = luaL_checkint(L, 3);
int w = luaL_checkint(L, 4);
int h = luaL_checkint(L, 5);
int dest_w = luaL_checkint(L, 6);
int dest_h = luaL_checkint(L, 7);
image_t *new = (image_t *) luaA_object_new(L, &image_class);
imlib_context_set_image(image->image);
new->image = imlib_create_cropped_scaled_image(source_x,
source_y,
w, h,
dest_w, dest_h);
return 1;
}
/** Draw a pixel in an image
* \param L The Lua VM state
*/
static int
luaA_image_draw_pixel(lua_State *L)
{
size_t len;
color_t color;
color_init_cookie_t cookie;
image_t *image = luaA_checkudata(L, 1, &image_class);
int x = luaL_checkint(L, 2);
int y = luaL_checkint(L, 3);
const char *buf = luaL_checklstring(L, 4, &len);
cookie = color_init_unchecked(&color, buf, len);
imlib_context_set_image(image->image);
color_init_reply(cookie);
if((x > imlib_image_get_width()) || (y > imlib_image_get_height()))
return 0;
imlib_context_set_color(color.red, color.green, color.blue, color.alpha);
imlib_image_draw_pixel(x, y, 1);
image->isupdated = false;
return 0;
}
/** Draw a line in an image
* \param L The Lua VM state
*/
static int
luaA_image_draw_line(lua_State *L)
{
size_t len;
color_t color;
color_init_cookie_t cookie;
image_t *image = luaA_checkudata(L, 1, &image_class);
int x1 = luaL_checkint(L, 2);
int y1 = luaL_checkint(L, 3);
int x2 = luaL_checkint(L, 4);
int y2 = luaL_checkint(L, 5);
const char *buf = luaL_checklstring(L, 6, &len);
cookie = color_init_unchecked(&color, buf, len);
imlib_context_set_image(image->image);
color_init_reply(cookie);
imlib_context_set_color(color.red, color.green, color.blue, color.alpha);
imlib_image_draw_line(x1, y1, x2, y2, 0);
image->isupdated = false;
return 0;
}
/** Draw a rectangle in an image
* \param L The Lua VM state
*/
static int
luaA_image_draw_rectangle(lua_State *L)
{
size_t len;
color_t color;
color_init_cookie_t cookie;
image_t *image = luaA_checkudata(L, 1, &image_class);
int x = luaL_checkint(L, 2);
int y = luaL_checkint(L, 3);
int width = luaL_checkint(L, 4);
int height = luaL_checkint(L, 5);
int fill = luaA_checkboolean(L, 6);
const char *buf = luaL_checklstring(L, 7, &len);
cookie = color_init_unchecked(&color, buf, len);
imlib_context_set_image(image->image);
color_init_reply(cookie);
imlib_context_set_color(color.red, color.green, color.blue, color.alpha);
if(!fill)
imlib_image_draw_rectangle(x, y, width, height);
else
imlib_image_fill_rectangle(x, y, width, height);
image->isupdated = false;
return 0;
}
/** Convert a table to a color range and set it as current color range.
* \param L The Lua VM state.
* \param ud The index of the table.
* \return A color range that you are responsible to free.
*/
static Imlib_Color_Range
luaA_table_to_color_range(lua_State *L, int ud)
{
Imlib_Color_Range range = imlib_create_color_range();
imlib_context_set_color_range(range);
for(size_t i = 1; i <= lua_objlen(L, ud); i++)
{
/* get t[i] */
lua_pushnumber(L, i);
lua_gettable(L, ud);
size_t len;
const char *colstr = lua_tolstring(L, -1, &len);
if(colstr)
{
color_t color;
color_init_cookie_t cookie = color_init_unchecked(&color, colstr, len);
/* get value with colstr as key in table */
lua_pushvalue(L, -1);
lua_gettable(L, ud);
/* convert the distance, if any, to number, or set 1 */
int distance = lua_tonumber(L, -1);
/* remove distance */
lua_pop(L, 1);
color_init_reply(cookie);
imlib_context_set_color(color.red, color.green, color.blue, color.alpha);
imlib_add_color_to_color_range(distance);
}
/* remove color string (value) */
lua_pop(L, 1);
}
return range;
}
/** Draw a rectangle in an image with gradient color.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_image_draw_rectangle_gradient(lua_State *L)
{
image_t *image = luaA_checkudata(L, 1, &image_class);
int x = luaL_checkint(L, 2);
int y = luaL_checkint(L, 3);
int width = luaL_checkint(L, 4);
int height = luaL_checkint(L, 5);
luaA_checktable(L, 6);
double angle = luaL_checknumber(L, 7);
imlib_context_set_image(image->image);
luaA_table_to_color_range(L, 6);
imlib_image_fill_color_range_rectangle(x, y, width, height, angle);
imlib_free_color_range();
image->isupdated = false;
return 0;
}
/** Draw a circle in an image
* \param L The Lua VM state
*/
static int
luaA_image_draw_circle(lua_State *L)
{
size_t len;
color_t color;
color_init_cookie_t cookie;
image_t *image = luaA_checkudata(L, 1, &image_class);
int x = luaL_checkint(L, 2);
int y = luaL_checkint(L, 3);
int ah = luaL_checkint(L, 4);
int av = luaL_checkint(L, 5);
int fill = luaA_checkboolean(L, 6);
const char *buf = luaL_checklstring(L, 7, &len);
cookie = color_init_unchecked(&color, buf, len);
imlib_context_set_image(image->image);
color_init_reply(cookie);
imlib_context_set_color(color.red, color.green, color.blue, color.alpha);
if(!fill)
imlib_image_draw_ellipse(x, y, ah, av);
else
imlib_image_fill_ellipse(x, y, ah, av);
image->isupdated = false;
return 0;
}
/** Saves the image to the given path. The file extension (e.g. .png or .jpg)
* will affect the output format.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_image_save(lua_State *L)
{
image_t *image = luaA_checkudata(L, 1, &image_class);
const char *path = luaL_checkstring(L, 2);
Imlib_Load_Error err;
imlib_context_set_image(image->image);
imlib_save_image_with_error_return(path, &err);
if(err != IMLIB_LOAD_ERROR_NONE)
warn("cannot save image %s: %s", path, image_imlib_load_strerror(err));
return 0;
}
/** Insert one image into another.
* \param L The Lua VM state.
* \return The number of elements pushed on stack.
*/
static int
luaA_image_insert(lua_State *L)
{
image_t *image_target = luaA_checkudata(L, 1, &image_class);
image_t *image_source = luaA_checkudata(L, 2, &image_class);
int xoff = luaL_optnumber(L, 3, 0);
int yoff = luaL_optnumber(L, 4, 0);
int xsrc = luaL_optnumber(L, 5, 0);
int ysrc = luaL_optnumber(L, 6, 0);
int wsrc = luaL_optnumber(L, 7, image_get_width(image_source));
int hsrc = luaL_optnumber(L, 8, image_get_height(image_source));
int hxoff = luaL_optnumber(L, 9, image_get_width(image_source));
int hyoff = luaL_optnumber(L, 10, 0);
int vxoff = luaL_optnumber(L, 11, 0);
int vyoff = luaL_optnumber(L, 12, image_get_height(image_source));
imlib_context_set_image(image_target->image);
imlib_blend_image_onto_image_skewed(image_source->image, 0,
/* source rectangle */
xsrc, ysrc, wsrc, hsrc,
/* position of the source image in the target image */
xoff, yoff,
/* axis offsets for the source image, (w|0|0|h)
* is the default */
hxoff, hyoff, vxoff, vyoff);
image_target->isupdated = false;
return 0;
}
static int
luaA_image_get_width(lua_State *L, image_t *image)
{
lua_pushnumber(L, image_get_width(image));
return 1;
}
static int
luaA_image_get_height(lua_State *L, image_t *image)
{
lua_pushnumber(L, image_get_height(image));
return 1;
}
static int
luaA_image_get_alpha(lua_State *L, image_t *image)
{
imlib_context_set_image(image->image);
lua_pushboolean(L, imlib_image_has_alpha());
return 1;
}
LUA_CLASS_FUNCS(image, (lua_class_t *) &image_class)
void
image_class_setup(lua_State *L)
{
static const struct luaL_reg image_methods[] =
{
LUA_CLASS_METHODS(image)
{ "argb32", luaA_image_argb32_new },
{ "rotate", luaA_image_rotate },
{ "orientate", luaA_image_orientate },
{ "crop", luaA_image_crop },
{ "crop_and_scale", luaA_image_crop_and_scale },
{ "save", luaA_image_save },
{ "insert", luaA_image_insert },
/* draw on images, whee! */
{ "draw_pixel", luaA_image_draw_pixel },
{ "draw_line", luaA_image_draw_line },
{ "draw_rectangle", luaA_image_draw_rectangle },
{ "draw_rectangle_gradient", luaA_image_draw_rectangle_gradient },
{ "draw_circle", luaA_image_draw_circle },
{ NULL, NULL }
};
static const struct luaL_reg image_module_meta[] =
{
{ "__call", luaA_image_new },
{ NULL, NULL }
};
luaA_class_setup(L, &image_class, "image", NULL,
sizeof(image_t), NULL,
(lua_class_collector_t) image_wipe,
NULL,
image_methods, image_module_meta, NULL);
static const lua_class_property_entry_t image_property_get[] =
{
{ "width", (lua_class_propfunc_t) luaA_image_get_width },
{ "height", (lua_class_propfunc_t) luaA_image_get_height },
{ "alpha", (lua_class_propfunc_t) luaA_image_get_alpha },
{ NULL, NULL }
};
static const lua_class_property_entry_t image_property_set[] =
{
{ NULL, NULL }
};
luaA_class_property_setup(L, &image_class, image_property_get, image_property_set);
}
// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80