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image: export drawing routines to lua 

Signed-off-by: Gregor Best <farhaven@googlemail.com>
Signed-off-by: Julien Danjou <julien@danjou.info>
This commit is contained in:
Gregor Best 2009-04-16 03:05:16 +02:00 committed by Julien Danjou
parent 4431d67679
commit ece9eb8874
1 changed files with 180 additions and 0 deletions
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180
image.c
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@ -327,6 +327,180 @@ luaA_image_crop_and_scale(lua_State *L)
return 1;
}
/** Draw a pixel in an image
* \param L The Lua VM state
* \luastack
* \lvalua An image.
* \lparam The x coordinate of the pixel to draw
* \lparam The y coordinate of the pixel to draw
* \lparam The color to draw the pixel in
*/
static int
luaA_image_draw_pixel(lua_State *L)
{
size_t len;
xcolor_t color;
xcolor_init_request_t cookie;
image_t *image = luaL_checkudata(L, 1, "image");
int x = luaL_checkint(L, 2);
int y = luaL_checkint(L, 3);
const char *buf = luaL_checklstring(L, 4, &len);
cookie = xcolor_init_unchecked(&color, buf, len);
imlib_context_set_image(image->image);
xcolor_init_reply(cookie);
if((x > imlib_image_get_width()) || (y > imlib_image_get_height()))
return 0;
color.red /= 256;
color.green /= 256;
color.blue /= 256;
color.alpha /= 256;
imlib_context_set_color(color.red, color.green, color.blue, color.alpha);
imlib_image_draw_pixel(x, y, 1);
image_compute(image);
return 0;
}
/** Draw a line in an image
* \param L The Lua VM state
* \luastack
* \lvalua An image.
* \lparam The x1 coordinate of the line to draw
* \lparam The y1 coordinate of the line to draw
* \lparam The x2 coordinate of the line to draw
* \lparam The y2 coordinate of the line to draw
* \lparam The color to draw the line in
*/
static int
luaA_image_draw_line(lua_State *L)
{
size_t len;
xcolor_t color;
xcolor_init_request_t cookie;
image_t *image = luaL_checkudata(L, 1, "image");
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 = xcolor_init_unchecked(&color, buf, len);
imlib_context_set_image(image->image);
xcolor_init_reply(cookie);
if((MAX(x1,x2) > imlib_image_get_width()) || (MAX(y1,y2) > imlib_image_get_height()))
return 0;
color.red /= 256;
color.green /= 256;
color.blue /= 256;
color.alpha /= 256;
imlib_context_set_color(color.red, color.green, color.blue, color.alpha);
imlib_image_draw_line(x1, y1, x2, y2, 1);
image_compute(image);
return 0;
}
/** Draw a rectangle in an image
* \param L The Lua VM state
* \luastack
* \lvalua An image.
* \lparam The x coordinate of the rectangles top left corner
* \lparam The y coordinate of the rectangles top left corner
* \lparam The width of the rectangle
* \lparam The height of the rectangle
* \lparam True if the rectangle should be filled, False otherwise
* \lparam The color to draw the rectangle in
*/
static int
luaA_image_draw_rectangle(lua_State *L)
{
size_t len;
xcolor_t color;
xcolor_init_request_t cookie;
image_t *image = luaL_checkudata(L, 1, "image");
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 = xcolor_init_unchecked(&color, buf, len);
imlib_context_set_image(image->image);
xcolor_init_reply(cookie);
if((x > imlib_image_get_width()) || (x + width > imlib_image_get_width()))
return 0;
if((y > imlib_image_get_height()) || (y + height > imlib_image_get_height()))
return 0;
color.red /= 256;
color.green /= 256;
color.blue /= 256;
color.alpha /= 256;
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_compute(image);
return 0;
}
/** Draw a circle in an image
* \param L The Lua VM state
* \luastack
* \lvalua An image.
* \lparam The x coordinate of the center of the circle
* \lparam The y coordinate of the center of the circle
* \lparam The horizontal amplitude (width)
* \lparam The vertical amplitude (height)
* \lparam True if the circle should be filled, False otherwise
* \lparam The color to draw the circle in
*/
static int
luaA_image_draw_circle(lua_State *L)
{
size_t len;
xcolor_t color;
xcolor_init_request_t cookie;
image_t *image = luaL_checkudata(L, 1, "image");
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 = xcolor_init_unchecked(&color, buf, len);
imlib_context_set_image(image->image);
xcolor_init_reply(cookie);
if((x > imlib_image_get_width()) || (x + ah > imlib_image_get_width()) || (x - ah < 0))
return 0;
if((y > imlib_image_get_height()) || (y + av > imlib_image_get_height()) || (y - av < 0))
return 0;
color.red /= 256;
color.green /= 256;
color.blue /= 256;
color.alpha /= 256;
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_compute(image);
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.
@ -404,6 +578,12 @@ const struct luaL_reg awesome_image_meta[] =
{ "crop", luaA_image_crop },
{ "crop_and_scale", luaA_image_crop_and_scale },
{ "save", luaA_image_save },
/* draw on images, whee! */
{ "draw_pixel", luaA_image_draw_pixel },
{ "draw_line", luaA_image_draw_line },
{ "draw_rectangle", luaA_image_draw_rectangle },
{ "draw_circle", luaA_image_draw_circle },
/* */
{ "__gc", luaA_image_gc },
{ "__tostring", luaA_image_tostring },
{ NULL, NULL }