diff options
Diffstat (limited to 'backend/dvi/cairo-device.c')
| -rw-r--r-- | backend/dvi/cairo-device.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/backend/dvi/cairo-device.c b/backend/dvi/cairo-device.c new file mode 100644 index 0000000..19006d2 --- /dev/null +++ b/backend/dvi/cairo-device.c @@ -0,0 +1,295 @@ +/* + * Copyright (C) 2007 Carlos Garcia Campos <carlosgc@gnome.org> + * + * 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 2, 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, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#include <gdk/gdkcolor.h> +#include "cairo-device.h" + +typedef struct { + cairo_t *cr; + + gint xmargin; + gint ymargin; + + gdouble scale; + + Ulong fg; + Ulong bg; + +} DviCairoDevice; + +static void +dvi_cairo_draw_glyph (DviContext *dvi, + DviFontChar *ch, + int x0, + int y0) +{ + DviCairoDevice *cairo_device; + int x, y, w, h; + gboolean isbox; + DviGlyph *glyph; + cairo_surface_t *surface; + + cairo_device = (DviCairoDevice *) dvi->device.device_data; + + glyph = &ch->grey; + + isbox = (glyph->data == NULL || (dvi->params.flags & MDVI_PARAM_CHARBOXES)); + + x = - glyph->x + x0 + cairo_device->xmargin; + y = - glyph->y + y0 + cairo_device->ymargin; + w = glyph->w; + h = glyph->h; + + surface = cairo_get_target (cairo_device->cr); + if (x < 0 || y < 0 + || x + w > cairo_image_surface_get_width (surface) + || y + h > cairo_image_surface_get_height (surface)) + return; + + cairo_save (cairo_device->cr); + if (isbox) { + cairo_rectangle (cairo_device->cr, + x - cairo_device->xmargin, + y - cairo_device->ymargin, + w, h); + cairo_stroke (cairo_device->cr); + } else { + cairo_translate (cairo_device->cr, x, y); + cairo_set_source_surface (cairo_device->cr, + (cairo_surface_t *) glyph->data, + 0, 0); + cairo_paint (cairo_device->cr); + } + + cairo_restore (cairo_device->cr); +} + +static void +dvi_cairo_draw_rule (DviContext *dvi, + int x, + int y, + Uint width, + Uint height, + int fill) +{ + DviCairoDevice *cairo_device; + Ulong color; + + cairo_device = (DviCairoDevice *) dvi->device.device_data; + + color = cairo_device->fg; + + cairo_save (cairo_device->cr); + + cairo_set_line_width (cairo_device->cr, + cairo_get_line_width (cairo_device->cr) * cairo_device->scale); + cairo_set_source_rgb (cairo_device->cr, + ((color >> 16) & 0xff) / 255., + ((color >> 8) & 0xff) / 255., + ((color >> 0) & 0xff) / 255.); + + cairo_rectangle (cairo_device->cr, + x + cairo_device->xmargin, + y + cairo_device->ymargin, + width, height); + if (fill == 0) { + cairo_stroke (cairo_device->cr); + } else { + cairo_fill (cairo_device->cr); + } + + cairo_restore (cairo_device->cr); +} + +static int +dvi_cairo_alloc_colors (void *device_data, + Ulong *pixels, + int npixels, + Ulong fg, + Ulong bg, + double gamma, + int density) +{ + double frac; + GdkColor color, color_fg, color_bg; + int i, n; + + color_bg.red = (bg >> 16) & 0xff; + color_bg.green = (bg >> 8) & 0xff; + color_bg.blue = (bg >> 0) & 0xff; + + color_fg.red = (fg >> 16) & 0xff; + color_fg.green = (fg >> 8) & 0xff; + color_fg.blue = (fg >> 0) & 0xff; + + n = npixels - 1; + for (i = 0; i < npixels; i++) { + frac = (gamma > 0) ? + pow ((double)i / n, 1 / gamma) : + 1 - pow ((double)(n - i) / n, -gamma); + + color.red = frac * ((double)color_fg.red - color_bg.red) + color_bg.red; + color.green = frac * ((double)color_fg.green - color_bg.green) + color_bg.green; + color.blue = frac * ((double)color_fg.blue - color_bg.blue) + color_bg.blue; + + pixels[i] = (color.red << 16) + (color.green << 8) + color.blue + 0xff000000; + } + + return npixels; +} + +static void * +dvi_cairo_create_image (void *device_data, + Uint width, + Uint height, + Uint bpp) +{ + return cairo_image_surface_create (CAIRO_FORMAT_RGB24, width, height); +} + +static void +dvi_cairo_free_image (void *ptr) +{ + cairo_surface_destroy ((cairo_surface_t *)ptr); +} + +static void +dvi_cairo_put_pixel (void *image, int x, int y, Ulong color) +{ + cairo_t *cr; + cairo_surface_t *surface; + gint rowstride; + guchar *p; + + surface = (cairo_surface_t *) image; + + rowstride = cairo_image_surface_get_stride (surface); + p = cairo_image_surface_get_data (surface) + y * rowstride + x * 4; + + p[2] = (color >> 16) & 0xff; + p[1] = (color >> 8) & 0xff; + p[0] = (color >> 0) & 0xff; +} + +static void +dvi_cairo_set_color (void *device_data, Ulong fg, Ulong bg) +{ + DviCairoDevice *cairo_device = (DviCairoDevice *) device_data; + + cairo_device->fg = fg; + cairo_device->bg = bg; +} + +/* Public methods */ +void +mdvi_cairo_device_init (DviDevice *device) +{ + device->device_data = g_new0 (DviCairoDevice, 1); + + device->draw_glyph = dvi_cairo_draw_glyph; + device->draw_rule = dvi_cairo_draw_rule; + device->alloc_colors = dvi_cairo_alloc_colors; + device->create_image = dvi_cairo_create_image; + device->free_image = dvi_cairo_free_image; + device->put_pixel = dvi_cairo_put_pixel; + device->set_color = dvi_cairo_set_color; + device->refresh = NULL; +} + +void +mdvi_cairo_device_free (DviDevice *device) +{ + DviCairoDevice *cairo_device; + + cairo_device = (DviCairoDevice *) device->device_data; + + if (cairo_device->cr) + cairo_destroy (cairo_device->cr); + + g_free (cairo_device); +} + +cairo_surface_t * +mdvi_cairo_device_get_surface (DviDevice *device) +{ + DviCairoDevice *cairo_device; + + cairo_device = (DviCairoDevice *) device->device_data; + + return cairo_surface_reference (cairo_get_target (cairo_device->cr)); +} + +void +mdvi_cairo_device_render (DviContext* dvi) +{ + DviCairoDevice *cairo_device; + gint page_width; + gint page_height; + cairo_surface_t *surface; + gchar *pixels; + gint rowstride; + static const cairo_user_data_key_t key; + + cairo_device = (DviCairoDevice *) dvi->device.device_data; + + if (cairo_device->cr) + cairo_destroy (cairo_device->cr); + + page_width = dvi->dvi_page_w * dvi->params.conv + 2 * cairo_device->xmargin; + page_height = dvi->dvi_page_h * dvi->params.vconv + 2 * cairo_device->ymargin; + + rowstride = page_width * 4; + pixels = (gchar *) g_malloc (page_height * rowstride); + memset (pixels, 0xff, page_height * rowstride); + + surface = cairo_image_surface_create_for_data (pixels, + CAIRO_FORMAT_RGB24, + page_width, page_height, + rowstride); + cairo_surface_set_user_data (surface, &key, + pixels, (cairo_destroy_func_t)g_free); + + cairo_device->cr = cairo_create (surface); + cairo_surface_destroy (surface); + + mdvi_dopage (dvi, dvi->currpage); +} + +void +mdvi_cairo_device_set_margins (DviDevice *device, + gint xmargin, + gint ymargin) +{ + DviCairoDevice *cairo_device; + + cairo_device = (DviCairoDevice *) device->device_data; + + cairo_device->xmargin = xmargin; + cairo_device->ymargin = ymargin; +} + +void +mdvi_cairo_device_set_scale (DviDevice *device, + gdouble scale) +{ + DviCairoDevice *cairo_device; + + cairo_device = (DviCairoDevice *) device->device_data; + + cairo_device->scale = scale; +} |