/* * Copyright (C) 2007 Carlos Garcia Campos * * 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 #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; }