--- /dev/null
+/* ply-label.c - label control
+ *
+ * Copyright (C) 2008 Red Hat, Inc.
+ * Copyright (c) 2016 SUSE LINUX GmbH, Nuernberg, Germany.
+ *
+ * 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.
+ *
+ * Written by: Ray Strode <rstrode@redhat.com>
+ * Written by: Fabian Vogt <fvogt@suse.com>
+ */
+#include "config.h"
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <limits.h>
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+#include "ply-pixel-buffer.h"
+#include "ply-pixel-display.h"
+#include "ply-utils.h"
+
+#include "ply-label-plugin.h"
+
+/* This is used if fontconfig (fc-match) is not available, like in the initrd. */
+#define FONT_FALLBACK "/usr/share/fonts/Plymouth.ttf"
+
+struct _ply_label_plugin_control
+{
+ ply_pixel_display_t *display;
+ ply_rectangle_t area;
+
+ ply_label_alignment_t alignment;
+ long width; /* For alignment (line wrapping?) */
+
+ FT_Library library;
+ FT_Face face;
+
+ char *text;
+ float red;
+ float green;
+ float blue;
+ float alpha;
+
+ uint32_t is_hidden : 1;
+};
+
+ply_label_plugin_interface_t *ply_label_plugin_get_interface (void);
+
+/* Query fontconfig, if available, for the default font. */
+static const char *
+query_fc_match ()
+{
+ FILE *fp;
+ static char fc_match_out[PATH_MAX];
+
+ fp = popen ("/usr/bin/fc-match -f %{file}", "r");
+ if (!fp)
+ return NULL;
+
+ fgets (fc_match_out, sizeof(fc_match_out), fp);
+
+ pclose (fp);
+
+ return fc_match_out;
+}
+
+static ply_label_plugin_control_t *
+create_control (void)
+{
+ FT_Error error;
+ ply_label_plugin_control_t *label;
+ const char *font_path;
+
+ label = calloc (1, sizeof(ply_label_plugin_control_t));
+
+ label->is_hidden = true;
+ label->width = -1;
+ label->text = NULL;
+
+ error = FT_Init_FreeType (&label->library);
+ if (error) {
+ free (label);
+ return NULL;
+ }
+
+ font_path = query_fc_match ();
+ if (font_path)
+ error = FT_New_Face (label->library, font_path, 0, &label->face);
+
+ if (!font_path || error) {
+ printf ("label-ft: trying font fallback\n");
+ font_path = FONT_FALLBACK;
+ error = FT_New_Face (label->library, font_path, 0, &label->face);
+
+ if (error) {
+ FT_Done_FreeType (label->library);
+ free (label);
+ return NULL;
+ }
+ }
+
+ /* 12pt/96dpi as default */
+ error = FT_Set_Char_Size (label->face, 12 << 6, 0, 96, 0);
+ if (error) {
+ FT_Done_Face (label->face);
+ FT_Done_FreeType (label->library);
+ free (label);
+ return NULL;
+ }
+
+ return label;
+}
+
+static void
+destroy_control (ply_label_plugin_control_t *label)
+{
+ if (label == NULL)
+ return;
+
+ free (label->text);
+ FT_Done_Face (label->face);
+ FT_Done_FreeType (label->library);
+
+ free (label);
+}
+
+static long
+get_width_of_control (ply_label_plugin_control_t *label)
+{
+ return label->area.width;
+}
+
+static long
+get_height_of_control (ply_label_plugin_control_t *label)
+{
+ return label->area.height;
+}
+
+static FT_Int
+width_of_line (ply_label_plugin_control_t *label,
+ const char *text)
+{
+ FT_Int width = 0;
+ FT_Int last_left = 0;
+
+ while (*text != '\0' && *text != '\n') {
+ if (FT_Load_Char (label->face, *text, FT_LOAD_RENDER))
+ continue;
+
+ width += label->face->glyph->advance.x >> 6;
+ last_left = label->face->glyph->bitmap_left;
+
+ ++text;
+ }
+
+ return width + last_left;
+}
+
+static void
+size_control (ply_label_plugin_control_t *label)
+{
+ FT_Int width;
+ const char *text = label->text;
+
+ if (label->is_hidden)
+ return;
+
+ label->area.width = 0;
+ label->area.height = 0;
+
+ /* Go through each line */
+ while (text && *text) {
+ width = width_of_line (label, text);
+ if ((uint32_t) width > label->area.width)
+ label->area.width = width;
+
+ label->area.height += (label->face->size->metrics.ascender
+ - label->face->size->metrics.descender) >> 6;
+
+ text = strchr (text, '\n');
+ /* skip newline character */
+ if (text)
+ ++text;
+ }
+
+ /* If centered, area.x is not the origin anymore */
+ if ((long) label->area.width < label->width)
+ label->area.width = label->width;
+}
+
+static void
+trigger_redraw (ply_label_plugin_control_t *label,
+ bool adjust_size)
+{
+ ply_rectangle_t dirty_area = label->area;
+
+ if (label->is_hidden || label->display == NULL)
+ return;
+
+ if (adjust_size)
+ size_control (label);
+
+ ply_pixel_display_draw_area (label->display,
+ dirty_area.x, dirty_area.y,
+ dirty_area.width, dirty_area.height);
+}
+
+static void
+draw_bitmap (ply_label_plugin_control_t *label,
+ uint32_t *target,
+ ply_rectangle_t target_size,
+ FT_Bitmap *source,
+ FT_Int x_start,
+ FT_Int y_start)
+{
+ FT_Int x, y, xs, ys;
+ FT_Int x_end = MIN (x_start + source->width, target_size.width);
+ FT_Int y_end = MIN (y_start + source->rows, target_size.height);
+
+ if ((uint32_t) x_start >= target_size.width ||
+ (uint32_t) y_start >= target_size.height)
+ return;
+
+ uint8_t rs, gs, bs, rd, gd, bd, ad;
+ rs = 255 * label->red;
+ gs = 255 * label->green;
+ bs = 255 * label->blue;
+
+ for (y = y_start, ys = 0; y < y_end; ++y, ++ys) {
+ for (x = x_start, xs = 0; x < x_end; ++x, ++xs) {
+ float alpha = label->alpha *
+ (source->buffer[xs + source->pitch * ys] / 255.0f);
+ float invalpha = 1.0f - alpha;
+ uint32_t dest = target[x + target_size.width * y];
+
+ /* Separate colors */
+ rd = dest >> 16;
+ gd = dest >> 8;
+ bd = dest;
+
+ /* Alpha blending */
+ rd = invalpha * rd + alpha * rs;
+ gd = invalpha * gd + alpha * gs;
+ bd = invalpha * bd + alpha * bs;
+ /* Semi-correct: Disregard the target alpha */
+ ad = alpha * 255;
+
+ target[x + target_size.width * y] =
+ (ad << 24) | (rd << 16) | (gd << 8) | bd;
+ }
+ }
+}
+
+static void
+draw_control (ply_label_plugin_control_t *label,
+ ply_pixel_buffer_t *pixel_buffer,
+ long x,
+ long y,
+ unsigned long width,
+ unsigned long height)
+{
+ FT_Error error;
+ FT_Vector pen;
+ FT_GlyphSlot slot;
+ const char *cur_c;
+ uint32_t *target;
+ ply_rectangle_t target_size;
+
+ if (label->is_hidden)
+ return;
+
+ /* Check for overlap.
+ * TODO: Don't redraw everything if only a part should be drawn! */
+ if (label->area.x > x + (long) width || label->area.y > y + (long) height
+ || label->area.x + (long) label->area.width < x
+ || label->area.y + (long) label->area.height < y)
+ return;
+
+ slot = label->face->glyph;
+
+ cur_c = label->text;
+
+ target = ply_pixel_buffer_get_argb32_data (pixel_buffer);
+ ply_pixel_buffer_get_size (pixel_buffer, &target_size);
+
+ if (target_size.height == 0)
+ return; /* This happens sometimes. */
+
+ /* 64ths of a pixel */
+ pen.y = label->area.y << 6;
+
+ /* Make sure that the first row fits */
+ pen.y += label->face->size->metrics.ascender;
+
+ /* Go through each line */
+ while (*cur_c) {
+ pen.x = label->area.x << 6;
+
+ /* Start at start position (alignment) */
+ if (label->alignment == PLY_LABEL_ALIGN_CENTER)
+ pen.x += (label->width - width_of_line (label, cur_c)) << 5;
+ else if (label->alignment == PLY_LABEL_ALIGN_RIGHT)
+ pen.x += (label->width - width_of_line (label, cur_c)) << 6;
+
+ while (*cur_c && *cur_c != '\n') {
+ /* TODO: Unicode support. */
+ error = FT_Load_Char (label->face, *cur_c,
+ FT_LOAD_RENDER | FT_LOAD_TARGET_LIGHT);
+ if (error)
+ continue;
+
+ draw_bitmap (label, target, target_size, &slot->bitmap,
+ (pen.x >> 6) + slot->bitmap_left,
+ (pen.y >> 6) - slot->bitmap_top);
+
+ pen.x += slot->advance.x;
+ pen.y += slot->advance.y;
+
+ ++cur_c;
+ }
+ /* skip newline character */
+ if (*cur_c)
+ ++cur_c;
+
+ /* Next line */
+ pen.y += label->face->size->metrics.height;
+ }
+}
+
+static void
+set_alignment_for_control (ply_label_plugin_control_t *label,
+ ply_label_alignment_t alignment)
+{
+ if (label->alignment != alignment) {
+ label->alignment = alignment;
+ trigger_redraw (label, true);
+ }
+}
+
+static void
+set_width_for_control (ply_label_plugin_control_t *label,
+ long width)
+{
+ if (label->width != width) {
+ label->width = width;
+ trigger_redraw (label, true);
+ }
+}
+
+static void
+set_text_for_control (ply_label_plugin_control_t *label,
+ const char *text)
+{
+ if (label->text != text) {
+ free (label->text);
+ label->text = strdup (text);
+ trigger_redraw (label, true);
+ }
+}
+
+static void
+set_font_for_control (ply_label_plugin_control_t *label,
+ const char *fontdesc)
+{
+ /* Only able to set size */
+
+ char *size_str_after;
+ const char *size_str;
+ unsigned long size;
+ bool size_in_pixels;
+
+ size = 25; /* Default, if not set. */
+ size_in_pixels = false;
+
+ /* Format is "Family 1[,Family 2[,..]] [25[px]]" .
+ * [] means optional. */
+ size_str = strrchr (fontdesc, ' ');
+
+ if (size_str) {
+ size = strtoul (size_str, &size_str_after, 10);
+ if (size_str_after == size_str)
+ size = 25; /* Not a number */
+ else if (strcmp (size_str_after, "px") == 0)
+ size_in_pixels = true;
+ }
+
+ if (size_in_pixels)
+ FT_Set_Pixel_Sizes (label->face, 0, size);
+ else
+ FT_Set_Char_Size (label->face, size << 6, 0, 72, 0);
+
+ /* Ignore errors, to keep the current size. */
+
+ trigger_redraw (label, true);
+}
+
+static void
+set_color_for_control (ply_label_plugin_control_t *label,
+ float red,
+ float green,
+ float blue,
+ float alpha)
+{
+ label->red = red;
+ label->green = green;
+ label->blue = blue;
+ label->alpha = alpha;
+
+ trigger_redraw (label, false);
+}
+
+static bool
+show_control (ply_label_plugin_control_t *label,
+ ply_pixel_display_t *display,
+ long x,
+ long y)
+{
+ ply_rectangle_t dirty_area;
+
+ dirty_area = label->area;
+ label->display = display;
+ label->area.x = x;
+ label->area.y = y;
+
+ label->is_hidden = false;
+
+ size_control (label);
+
+ if (!label->is_hidden && label->display != NULL)
+ ply_pixel_display_draw_area (label->display,
+ dirty_area.x, dirty_area.y,
+ dirty_area.width, dirty_area.height);
+
+ label->is_hidden = false;
+
+ return true;
+}
+
+static void
+hide_control (ply_label_plugin_control_t *label)
+{
+ label->is_hidden = true;
+ if (label->display != NULL)
+ ply_pixel_display_draw_area (label->display,
+ label->area.x, label->area.y,
+ label->area.width, label->area.height);
+
+ label->display = NULL;
+}
+
+static bool
+is_control_hidden (ply_label_plugin_control_t *label)
+{
+ return label->is_hidden;
+}
+
+ply_label_plugin_interface_t *
+ply_label_plugin_get_interface (void)
+{
+ static ply_label_plugin_interface_t plugin_interface =
+ {
+ .create_control = create_control,
+ .destroy_control = destroy_control,
+ .show_control = show_control,
+ .hide_control = hide_control,
+ .draw_control = draw_control,
+ .is_control_hidden = is_control_hidden,
+ .set_text_for_control = set_text_for_control,
+ .set_alignment_for_control = set_alignment_for_control,
+ .set_width_for_control = set_width_for_control,
+ .set_font_for_control = set_font_for_control,
+ .set_color_for_control = set_color_for_control,
+ .get_width_of_control = get_width_of_control,
+ .get_height_of_control = get_height_of_control
+ };
+
+ return &plugin_interface;
+}
+
+/* vim: set ts=4 sw=4 expandtab autoindent cindent cino={.5s, (0: */
projects / thirdparty / plymouth.git / commitdiff
