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Diffstat (limited to 'app/text/gimptextlayout.c')
| -rw-r--r-- | app/text/gimptextlayout.c | 796 |
1 files changed, 796 insertions, 0 deletions
diff --git a/app/text/gimptextlayout.c b/app/text/gimptextlayout.c new file mode 100644 index 0000000..47beed7 --- /dev/null +++ b/app/text/gimptextlayout.c @@ -0,0 +1,796 @@ +/* GIMP - The GNU Image Manipulation Program + * Copyright (C) 1995 Spencer Kimball and Peter Mattis + * + * GimpText + * Copyright (C) 2002-2003 Sven Neumann <sven@gimp.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 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 <https://www.gnu.org/licenses/>. + */ + +#include "config.h" + +#include <string.h> + +#include <gegl.h> +#include <gdk-pixbuf/gdk-pixbuf.h> +#include <pango/pangocairo.h> + +#include "libgimpbase/gimpbase.h" +#include "libgimpcolor/gimpcolor.h" +#include "libgimpmath/gimpmath.h" + +#include "text-types.h" + +#include "core/gimperror.h" + +#include "gimptext.h" +#include "gimptextlayout.h" + +#include "gimp-intl.h" + +struct _GimpTextLayout +{ + GObject object; + + GimpText *text; + gdouble xres; + gdouble yres; + PangoLayout *layout; + PangoRectangle extents; +}; + + +static void gimp_text_layout_finalize (GObject *object); + +static void gimp_text_layout_position (GimpTextLayout *layout); +static void gimp_text_layout_set_markup (GimpTextLayout *layout, + GError **error); + +static PangoContext * gimp_text_get_pango_context (GimpText *text, + gdouble xres, + gdouble yres); + + +G_DEFINE_TYPE (GimpTextLayout, gimp_text_layout, G_TYPE_OBJECT) + +#define parent_class gimp_text_layout_parent_class + + +static void +gimp_text_layout_class_init (GimpTextLayoutClass *klass) +{ + GObjectClass *object_class = G_OBJECT_CLASS (klass); + + object_class->finalize = gimp_text_layout_finalize; +} + +static void +gimp_text_layout_init (GimpTextLayout *layout) +{ + layout->text = NULL; + layout->layout = NULL; +} + +static void +gimp_text_layout_finalize (GObject *object) +{ + GimpTextLayout *layout = GIMP_TEXT_LAYOUT (object); + + if (layout->text) + { + g_object_unref (layout->text); + layout->text = NULL; + } + if (layout->layout) + { + g_object_unref (layout->layout); + layout->layout = NULL; + } + + G_OBJECT_CLASS (parent_class)->finalize (object); +} + + +GimpTextLayout * +gimp_text_layout_new (GimpText *text, + gdouble xres, + gdouble yres, + GError **error) +{ + GimpTextLayout *layout; + PangoContext *context; + PangoFontDescription *font_desc; + PangoAlignment alignment = PANGO_ALIGN_LEFT; + gint size; + + g_return_val_if_fail (GIMP_IS_TEXT (text), NULL); + + font_desc = pango_font_description_from_string (text->font); + g_return_val_if_fail (font_desc != NULL, NULL); + + size = pango_units_from_double (gimp_units_to_points (text->font_size, + text->unit, + yres)); + + pango_font_description_set_size (font_desc, MAX (1, size)); + + context = gimp_text_get_pango_context (text, xres, yres); + + layout = g_object_new (GIMP_TYPE_TEXT_LAYOUT, NULL); + + layout->text = g_object_ref (text); + layout->layout = pango_layout_new (context); + layout->xres = xres; + layout->yres = yres; + + pango_layout_set_wrap (layout->layout, PANGO_WRAP_WORD_CHAR); + + pango_layout_set_font_description (layout->layout, font_desc); + pango_font_description_free (font_desc); + + gimp_text_layout_set_markup (layout, error); + + switch (text->justify) + { + case GIMP_TEXT_JUSTIFY_LEFT: + alignment = PANGO_ALIGN_LEFT; + break; + case GIMP_TEXT_JUSTIFY_RIGHT: + alignment = PANGO_ALIGN_RIGHT; + break; + case GIMP_TEXT_JUSTIFY_CENTER: + alignment = PANGO_ALIGN_CENTER; + break; + case GIMP_TEXT_JUSTIFY_FILL: + alignment = PANGO_ALIGN_LEFT; + pango_layout_set_justify (layout->layout, TRUE); + break; + } + + pango_layout_set_alignment (layout->layout, alignment); + + switch (text->box_mode) + { + case GIMP_TEXT_BOX_DYNAMIC: + break; + case GIMP_TEXT_BOX_FIXED: + if (! PANGO_GRAVITY_IS_VERTICAL (pango_context_get_base_gravity (context))) + pango_layout_set_width (layout->layout, + pango_units_from_double + (gimp_units_to_pixels (text->box_width, + text->box_unit, + xres))); + else + pango_layout_set_width (layout->layout, + pango_units_from_double + (gimp_units_to_pixels (text->box_height, + text->box_unit, + yres))); + break; + } + + pango_layout_set_indent (layout->layout, + pango_units_from_double + (gimp_units_to_pixels (text->indent, + text->unit, + xres))); + pango_layout_set_spacing (layout->layout, + pango_units_from_double + (gimp_units_to_pixels (text->line_spacing, + text->unit, + yres))); + + gimp_text_layout_position (layout); + + switch (text->box_mode) + { + case GIMP_TEXT_BOX_DYNAMIC: + break; + case GIMP_TEXT_BOX_FIXED: + layout->extents.width = ceil (gimp_units_to_pixels (text->box_width, + text->box_unit, + xres)); + layout->extents.height = ceil (gimp_units_to_pixels (text->box_height, + text->box_unit, + yres)); + +/* #define VERBOSE */ + +#ifdef VERBOSE + g_printerr ("extents set to %d x %d\n", + layout->extents.width, layout->extents.height); +#endif + break; + } + + g_object_unref (context); + + return layout; +} + +gboolean +gimp_text_layout_get_size (GimpTextLayout *layout, + gint *width, + gint *height) +{ + g_return_val_if_fail (GIMP_IS_TEXT_LAYOUT (layout), FALSE); + + if (width) + *width = layout->extents.width; + + if (height) + *height = layout->extents.height; + + return (layout->extents.width > 0 && layout->extents.height > 0); +} + +void +gimp_text_layout_get_offsets (GimpTextLayout *layout, + gint *x, + gint *y) +{ + g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout)); + + if (x) + *x = layout->extents.x; + + if (y) + *y = layout->extents.y; +} + +void +gimp_text_layout_get_resolution (GimpTextLayout *layout, + gdouble *xres, + gdouble *yres) +{ + g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout)); + + if (xres) + *xres = layout->xres; + + if (yres) + *yres = layout->yres; +} + +GimpText * +gimp_text_layout_get_text (GimpTextLayout *layout) +{ + g_return_val_if_fail (GIMP_IS_TEXT_LAYOUT (layout), NULL); + + return layout->text; +} + +PangoLayout * +gimp_text_layout_get_pango_layout (GimpTextLayout *layout) +{ + g_return_val_if_fail (GIMP_IS_TEXT_LAYOUT (layout), NULL); + + return layout->layout; +} + +void +gimp_text_layout_get_transform (GimpTextLayout *layout, + cairo_matrix_t *matrix) +{ + GimpText *text; + gdouble xres; + gdouble yres; + gdouble norm; + + g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout)); + g_return_if_fail (matrix != NULL); + + text = gimp_text_layout_get_text (layout); + + gimp_text_layout_get_resolution (layout, &xres, &yres); + + norm = 1.0 / yres * xres; + + matrix->xx = text->transformation.coeff[0][0] * norm; + matrix->xy = text->transformation.coeff[0][1] * 1.0; + matrix->yx = text->transformation.coeff[1][0] * norm; + matrix->yy = text->transformation.coeff[1][1] * 1.0; + matrix->x0 = 0; + matrix->y0 = 0; +} + +void +gimp_text_layout_transform_rect (GimpTextLayout *layout, + PangoRectangle *rect) +{ + cairo_matrix_t matrix; + gdouble x, y; + gdouble width, height; + + g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout)); + g_return_if_fail (rect != NULL); + + x = rect->x; + y = rect->y; + width = rect->width; + height = rect->height; + + gimp_text_layout_get_transform (layout, &matrix); + + cairo_matrix_transform_point (&matrix, &x, &y); + cairo_matrix_transform_distance (&matrix, &width, &height); + + rect->x = ROUND (x); + rect->y = ROUND (y); + rect->width = ROUND (width); + rect->height = ROUND (height); +} + +void +gimp_text_layout_transform_point (GimpTextLayout *layout, + gdouble *x, + gdouble *y) +{ + cairo_matrix_t matrix; + gdouble _x = 0.0; + gdouble _y = 0.0; + + g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout)); + + if (x) _x = *x; + if (y) _y = *y; + + gimp_text_layout_get_transform (layout, &matrix); + + cairo_matrix_transform_point (&matrix, &_x, &_y); + + if (x) *x = _x; + if (y) *y = _y; +} + +void +gimp_text_layout_transform_distance (GimpTextLayout *layout, + gdouble *x, + gdouble *y) +{ + cairo_matrix_t matrix; + gdouble _x = 0.0; + gdouble _y = 0.0; + + g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout)); + + if (x) _x = *x; + if (y) _y = *y; + + gimp_text_layout_get_transform (layout, &matrix); + + cairo_matrix_transform_distance (&matrix, &_x, &_y); + + if (x) *x = _x; + if (y) *y = _y; +} + +void +gimp_text_layout_untransform_rect (GimpTextLayout *layout, + PangoRectangle *rect) +{ + cairo_matrix_t matrix; + gdouble x, y; + gdouble width, height; + + g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout)); + g_return_if_fail (rect != NULL); + + x = rect->x; + y = rect->y; + width = rect->width; + height = rect->height; + + gimp_text_layout_get_transform (layout, &matrix); + + if (cairo_matrix_invert (&matrix) == CAIRO_STATUS_SUCCESS) + { + cairo_matrix_transform_point (&matrix, &x, &y); + cairo_matrix_transform_distance (&matrix, &width, &height); + + rect->x = ROUND (x); + rect->y = ROUND (y); + rect->width = ROUND (width); + rect->height = ROUND (height); + } +} + +void +gimp_text_layout_untransform_point (GimpTextLayout *layout, + gdouble *x, + gdouble *y) +{ + cairo_matrix_t matrix; + gdouble _x = 0.0; + gdouble _y = 0.0; + + g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout)); + + if (x) _x = *x; + if (y) _y = *y; + + gimp_text_layout_get_transform (layout, &matrix); + + if (cairo_matrix_invert (&matrix) == CAIRO_STATUS_SUCCESS) + { + cairo_matrix_transform_point (&matrix, &_x, &_y); + + if (x) *x = _x; + if (y) *y = _y; + } +} + +void +gimp_text_layout_untransform_distance (GimpTextLayout *layout, + gdouble *x, + gdouble *y) +{ + cairo_matrix_t matrix; + gdouble _x = 0.0; + gdouble _y = 0.0; + + g_return_if_fail (GIMP_IS_TEXT_LAYOUT (layout)); + + if (x) _x = *x; + if (y) _y = *y; + + gimp_text_layout_get_transform (layout, &matrix); + + if (cairo_matrix_invert (&matrix) == CAIRO_STATUS_SUCCESS) + { + cairo_matrix_transform_distance (&matrix, &_x, &_y); + + if (x) *x = _x; + if (y) *y = _y; + } +} + +static gboolean +gimp_text_layout_split_markup (const gchar *markup, + gchar **open_tag, + gchar **content, + gchar **close_tag) +{ + gchar *p_open; + gchar *p_close; + + p_open = strstr (markup, "<markup>"); + if (! p_open) + return FALSE; + + *open_tag = g_strndup (markup, p_open - markup + strlen ("<markup>")); + + p_close = g_strrstr (markup, "</markup>"); + if (! p_close) + { + g_free (*open_tag); + return FALSE; + } + + *close_tag = g_strdup (p_close); + + if (p_open + strlen ("<markup>") < p_close) + { + *content = g_strndup (p_open + strlen ("<markup>"), + p_close - p_open - strlen ("<markup>")); + } + else + { + *content = g_strdup (""); + } + + return TRUE; +} + +static gchar * +gimp_text_layout_apply_tags (GimpTextLayout *layout, + const gchar *markup) +{ + GimpText *text = layout->text; + gchar *result; + + { + guchar r, g, b; + + gimp_rgb_get_uchar (&text->color, &r, &g, &b); + + result = g_strdup_printf ("<span color=\"#%02x%02x%02x\">%s</span>", + r, g, b, markup); + } + + if (fabs (text->letter_spacing) > 0.1) + { + gchar *tmp = g_strdup_printf ("<span letter_spacing=\"%d\">%s</span>", + (gint) (text->letter_spacing * PANGO_SCALE), + result); + g_free (result); + result = tmp; + } + + return result; +} + +static void +gimp_text_layout_set_markup (GimpTextLayout *layout, + GError **error) +{ + GimpText *text = layout->text; + gchar *open_tag = NULL; + gchar *content = NULL; + gchar *close_tag = NULL; + gchar *tagged; + gchar *markup; + + if (text->markup) + { + if (! gimp_text_layout_split_markup (text->markup, + &open_tag, &content, &close_tag)) + { + open_tag = g_strdup ("<markup>"); + content = g_strdup (""); + close_tag = g_strdup ("</markup>"); + } + } + else + { + open_tag = g_strdup ("<markup>"); + close_tag = g_strdup ("</markup>"); + + if (text->text) + content = g_markup_escape_text (text->text, -1); + else + content = g_strdup (""); + } + + tagged = gimp_text_layout_apply_tags (layout, content); + + g_free (content); + + markup = g_strconcat (open_tag, tagged, close_tag, NULL); + + g_free (open_tag); + g_free (tagged); + g_free (close_tag); + + if (pango_parse_markup (markup, -1, 0, NULL, NULL, NULL, error) == FALSE) + { + if (error && *error && + (*error)->domain == G_MARKUP_ERROR && + (*error)->code == G_MARKUP_ERROR_INVALID_CONTENT) + { + /* Errors from pango lib are not accurate enough. + * Other possible error codes are: G_MARKUP_ERROR_UNKNOWN_ELEMENT + * and G_MARKUP_ERROR_UNKNOWN_ATTRIBUTE, which likely indicate a bug + * in GIMP code or a pango library version issue. + * G_MARKUP_ERROR_INVALID_CONTENT on the other hand likely indicates + * size/color/style/weight/variant/etc. value issue. Font size is the + * only free text in GIMP GUI so we assume that must be it. + * Also we output a custom message because pango's error->message is + * too technical (telling of <span> tags, not using user's font size + * unit, and such). */ + g_error_free (*error); + *error = NULL; + g_set_error_literal (error, GIMP_ERROR, GIMP_FAILED, + _("The new text layout cannot be generated. " + "Most likely the font size is too big.")); + } + } + else + pango_layout_set_markup (layout->layout, markup, -1); + + g_free (markup); +} + +static void +gimp_text_layout_position (GimpTextLayout *layout) +{ + PangoRectangle ink; + PangoRectangle logical; + PangoContext *context; + gint x1, y1; + gint x2, y2; + + layout->extents.x = 0; + layout->extents.y = 0; + layout->extents.width = 0; + layout->extents.height = 0; + + pango_layout_get_pixel_extents (layout->layout, &ink, &logical); + + ink.width = ceil ((gdouble) ink.width * layout->xres / layout->yres); + logical.width = ceil ((gdouble) logical.width * layout->xres / layout->yres); + context = pango_layout_get_context (layout->layout); + +#ifdef VERBOSE + g_printerr ("ink rect: %d x %d @ %d, %d\n", + ink.width, ink.height, ink.x, ink.y); + g_printerr ("logical rect: %d x %d @ %d, %d\n", + logical.width, logical.height, logical.x, logical.y); +#endif + + if (ink.width < 1 || ink.height < 1) + { + layout->extents.width = 1; + layout->extents.height = logical.height; + return; + } + + x1 = MIN (ink.x, logical.x); + y1 = MIN (ink.y, logical.y); + x2 = MAX (ink.x + ink.width, logical.x + logical.width); + y2 = MAX (ink.y + ink.height, logical.y + logical.height); + + layout->extents.x = - x1; + layout->extents.y = - y1; + layout->extents.width = x2 - x1; + layout->extents.height = y2 - y1; + + /* If the width of the layout is > 0, then the text-box is FIXED and + * the layout position should be offset if the alignment is centered + * or right-aligned, also adjust for RTL text direction. + */ + if (pango_layout_get_width (layout->layout) > 0) + { + PangoAlignment align = pango_layout_get_alignment (layout->layout); + GimpTextDirection base_dir = layout->text->base_dir; + gint width; + + pango_layout_get_pixel_size (layout->layout, &width, NULL); + + if ((base_dir == GIMP_TEXT_DIRECTION_LTR && align == PANGO_ALIGN_RIGHT) || + (base_dir == GIMP_TEXT_DIRECTION_RTL && align == PANGO_ALIGN_LEFT) || + (base_dir == GIMP_TEXT_DIRECTION_TTB_RTL && align == PANGO_ALIGN_RIGHT) || + (base_dir == GIMP_TEXT_DIRECTION_TTB_RTL_UPRIGHT && align == PANGO_ALIGN_RIGHT) || + (base_dir == GIMP_TEXT_DIRECTION_TTB_LTR && align == PANGO_ALIGN_LEFT) || + (base_dir == GIMP_TEXT_DIRECTION_TTB_LTR_UPRIGHT && align == PANGO_ALIGN_LEFT)) + { + layout->extents.x += + PANGO_PIXELS (pango_layout_get_width (layout->layout)) - width; + } + else if (align == PANGO_ALIGN_CENTER) + { + layout->extents.x += + (PANGO_PIXELS (pango_layout_get_width (layout->layout)) - width) / 2; + } + } + + if (layout->text->border > 0) + { + gint border = layout->text->border; + + layout->extents.x += border; + layout->extents.y += border; + layout->extents.width += 2 * border; + layout->extents.height += 2 * border; + } + + if (PANGO_GRAVITY_IS_VERTICAL (pango_context_get_base_gravity (context))) + { + gint temp; + + temp = layout->extents.y; + layout->extents.y = layout->extents.x; + layout->extents.x = temp; + + temp = layout->extents.height; + layout->extents.height = layout->extents.width; + layout->extents.width = temp; + } + +#ifdef VERBOSE + g_printerr ("layout extents: %d x %d @ %d, %d\n", + layout->extents.width, layout->extents.height, + layout->extents.x, layout->extents.y); +#endif +} + +static cairo_font_options_t * +gimp_text_get_font_options (GimpText *text) +{ + cairo_font_options_t *options = cairo_font_options_create (); + + cairo_font_options_set_antialias (options, (text->antialias ? + CAIRO_ANTIALIAS_DEFAULT : + CAIRO_ANTIALIAS_NONE)); + + switch (text->hint_style) + { + case GIMP_TEXT_HINT_STYLE_NONE: + cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_NONE); + break; + + case GIMP_TEXT_HINT_STYLE_SLIGHT: + cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_SLIGHT); + break; + + case GIMP_TEXT_HINT_STYLE_MEDIUM: + cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_MEDIUM); + break; + + case GIMP_TEXT_HINT_STYLE_FULL: + cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_FULL); + break; + } + + return options; +} + +static PangoContext * +gimp_text_get_pango_context (GimpText *text, + gdouble xres, + gdouble yres) +{ + PangoContext *context; + PangoFontMap *fontmap; + cairo_font_options_t *options; + + fontmap = pango_cairo_font_map_new_for_font_type (CAIRO_FONT_TYPE_FT); + if (! fontmap) + g_error ("You are using a Pango that has been built against a cairo " + "that lacks the Freetype font backend"); + + pango_cairo_font_map_set_resolution (PANGO_CAIRO_FONT_MAP (fontmap), yres); + + context = pango_font_map_create_context (fontmap); + g_object_unref (fontmap); + + options = gimp_text_get_font_options (text); + pango_cairo_context_set_font_options (context, options); + cairo_font_options_destroy (options); + + if (text->language) + pango_context_set_language (context, + pango_language_from_string (text->language)); + + switch (text->base_dir) + { + case GIMP_TEXT_DIRECTION_LTR: + pango_context_set_base_dir (context, PANGO_DIRECTION_LTR); + pango_context_set_gravity_hint (context, PANGO_GRAVITY_HINT_NATURAL); + pango_context_set_base_gravity (context, PANGO_GRAVITY_SOUTH); + break; + + case GIMP_TEXT_DIRECTION_RTL: + pango_context_set_base_dir (context, PANGO_DIRECTION_RTL); + pango_context_set_gravity_hint (context, PANGO_GRAVITY_HINT_NATURAL); + pango_context_set_base_gravity (context, PANGO_GRAVITY_SOUTH); + break; + + case GIMP_TEXT_DIRECTION_TTB_RTL: + pango_context_set_base_dir (context, PANGO_DIRECTION_LTR); + pango_context_set_gravity_hint (context, PANGO_GRAVITY_HINT_LINE); + pango_context_set_base_gravity (context, PANGO_GRAVITY_EAST); + break; + + case GIMP_TEXT_DIRECTION_TTB_RTL_UPRIGHT: + pango_context_set_base_dir (context, PANGO_DIRECTION_LTR); + pango_context_set_gravity_hint (context, PANGO_GRAVITY_HINT_STRONG); + pango_context_set_base_gravity (context, PANGO_GRAVITY_EAST); + break; + + case GIMP_TEXT_DIRECTION_TTB_LTR: + pango_context_set_base_dir (context, PANGO_DIRECTION_LTR); + pango_context_set_gravity_hint (context, PANGO_GRAVITY_HINT_LINE); + pango_context_set_base_gravity (context, PANGO_GRAVITY_WEST); + break; + + case GIMP_TEXT_DIRECTION_TTB_LTR_UPRIGHT: + pango_context_set_base_dir (context, PANGO_DIRECTION_LTR); + pango_context_set_gravity_hint (context, PANGO_GRAVITY_HINT_STRONG); + pango_context_set_base_gravity (context, PANGO_GRAVITY_WEST); + break; + } + + return context; +} |