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paps/paps-fix-cpi.patch
Akira TAGOH 10c01b83d5 Fix C type error in paps 0.6.8. 
Resolves: rhbz#2256906
2024-01-17 22:30:12 +09:00

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diff --git a/src/libpaps.c b/src/libpaps.c
index b6363a7..1b80257 100644
--- a/src/libpaps.c
+++ b/src/libpaps.c
@@ -55,6 +55,9 @@ typedef struct {
double last_pos_x;
double scale_x;
double scale_y;
+ double width;
+ double height;
+ double cpi;
} paps_private_t;
@@ -88,6 +91,26 @@ paps_t *paps_new()
}
void
+paps_set_paper_size(paps_t *paps_,
+ gdouble width,
+ gdouble height)
+{
+ paps_private_t *paps = (paps_private_t *)paps_;
+
+ paps->width = width;
+ paps->height = height;
+}
+
+void
+paps_set_cpi(paps_t *paps_,
+ gdouble cpi)
+{
+ paps_private_t *paps = (paps_private_t *)paps_;
+
+ paps->cpi = cpi;
+}
+
+void
paps_set_scale(paps_t *paps_,
gdouble scale_x,
gdouble scale_y)
@@ -401,7 +424,7 @@ static void draw_contour(paps_private_t *paps,
FT_Face ft_face = pango_ft2_font_get_face(font);
int num_glyphs = glyphs->num_glyphs;
int glyph_idx;
-
+
for (glyph_idx=0; glyph_idx<num_glyphs; glyph_idx++)
{
PangoGlyphGeometry geometry = glyphs->glyphs[glyph_idx].geometry;
@@ -410,7 +433,11 @@ static void draw_contour(paps_private_t *paps,
glyph_pos_x = x_pos + 1.0*geometry.x_offset * scale;
glyph_pos_y = line_start_pos_y - 1.0*geometry.y_offset * scale;
- x_pos += geometry.width * scale * paps->scale_x;
+ if (paps->cpi > 0.0L) {
+ x_pos += (1 / paps->cpi * 72.0);
+ } else {
+ x_pos += geometry.width * scale * paps->scale_x;
+ }
if (glyphs->glyphs[glyph_idx].glyph == PANGO_GLYPH_EMPTY)
continue;
diff --git a/src/libpaps.h b/src/libpaps.h
index 0b74321..cbb4042 100644
--- a/src/libpaps.h
+++ b/src/libpaps.h
@@ -53,10 +53,16 @@ void paps_free(paps_t *paps);
* @param scale_y y-coordinate scale
*
*/
-void
-paps_set_scale(paps_t *paps,
- gdouble scale_x,
- gdouble scale_y);
+void paps_set_scale(paps_t *paps,
+ gdouble scale_x,
+ gdouble scale_y);
+
+void paps_set_paper_size(paps_t *paps_,
+ gdouble width,
+ gdouble height);
+
+void paps_set_cpi(paps_t *paps_,
+ gdouble cpi);
/**
* libpaps may currently be used only with a PangoContext that it
diff --git a/src/paps.c b/src/paps.c
index 334d547..72dbaad 100644
--- a/src/paps.c
+++ b/src/paps.c
@@ -33,6 +33,8 @@
#include <locale.h>
#include <cups/cups.h>
#include <cups/ppd.h>
+#include <math.h>
+#include <wchar.h>
#define BUFSIZE 1024
#define DEFAULT_FONT_FAMILY "Monospace"
@@ -594,6 +596,8 @@ int main(int argc, char *argv[])
page_layout.owner = page_owner;
page_layout.cups_mode = cups_mode;
+ paps_set_paper_size(paps, page_width, page_height);
+
/* calculate x-coordinate scale */
if (page_layout.cpi > 0.0L)
{
@@ -606,7 +610,7 @@ int main(int argc, char *argv[])
w = pango_font_metrics_get_approximate_digit_width (metrics);
if (w > max_width)
max_width = w;
- page_layout.scale_x = 1 / page_layout.cpi * 72.0 * PANGO_SCALE / max_width;
+ page_layout.scale_x = 1 / page_layout.cpi * 72.0 * (gdouble)PANGO_SCALE / (gdouble)max_width;
pango_font_metrics_unref (metrics);
g_object_unref (G_OBJECT (fontmap));
@@ -614,6 +618,8 @@ int main(int argc, char *argv[])
// update the font size to that width
pango_font_description_set_size (font_description, font_size * page_layout.scale_x);
pango_context_set_font_description (pango_context, font_description);
+
+ paps_set_cpi(paps, page_layout.cpi);
}
page_layout.scale_x = page_layout.scale_y = 1.0;
@@ -727,119 +733,6 @@ read_file (FILE *file,
return text;
}
-#if 0
-/* Take a UTF8 string and break it into paragraphs on \n characters.
- *
- * Sorry. I couldn't figure out what this version was supposed to do
- *
- */
-static GList *
-split_text_into_paragraphs (PangoContext *pango_context,
- page_layout_t *page_layout,
- int paint_width, /* In pixels */
- char *text)
-{
- char *p = text;
- char *next;
- gunichar wc;
- GList *result = NULL;
- char *last_para = text;
-
- while (p != NULL && *p)
- {
- wc = g_utf8_get_char (p);
- next = g_utf8_next_char (p);
- if (wc == (gunichar)-1)
- {
- fprintf (stderr, "%s: Invalid character in input\n", g_get_prgname ());
- wc = 0;
- }
- if (!*p || !wc || wc == '\n' || wc == '\f')
- {
- Paragraph *para = g_new (Paragraph, 1);
- para->text = last_para;
- para->length = p - last_para;
- para->layout = pango_layout_new (pango_context);
-
- if (cpi > 0.0L && page_layout->do_wordwrap)
- {
- PangoRectangle ink_rect, logical_rect;
- wchar_t *wtext, *wnewtext;
- gchar *newtext;
- size_t i, len, wwidth = 0, n;
-
- wtext = g_utf8_to_ucs4 (para->text, para->length, NULL, NULL, NULL);
- if (wtext == NULL)
- {
- fprintf (stderr, "Failed to convert UTF-8 to UCS-4.\n");
- exit(1);
- }
-
- len = g_utf8_strlen (para->text, para->length);
- /* the amount of characters to be able to put on the line against CPI */
- n = page_layout->column_width / 72.0 * cpi;
- if (len > n)
- {
- wnewtext = g_new (wchar_t, wcslen (wtext) + 1);
- if (wnewtext == NULL)
- {
- fprintf (stderr, "Failed to allocate a memory.\n");
- g_free (wtext);
- exit(1);
- }
- for (i = 0; i < len; i++)
- {
- wwidth += wcwidth (wtext[i]);
- if (wwidth > n)
- break;
- wnewtext[i] = wtext[i];
- }
- wnewtext[i] = 0L;
-
- newtext = g_ucs4_to_utf8 ((const gunichar *)wnewtext, i, NULL, NULL, NULL);
- if (newtext == NULL)
- {
- fprintf (stderr, "Failed to convert UCS-4 to UTF-8.\n");
- exit(1);
- }
-
- pango_layout_set_text (para->layout, newtext, -1);
- pango_layout_get_extents (para->layout, &ink_rect, &logical_rect);
- /* update paint_width to wrap_against CPI */
- paint_width = logical_rect.width / PANGO_SCALE;
- g_free (newtext);
- g_free (wnewtext);
- }
- g_free (wtext);
- }
- pango_layout_set_text (para->layout, para->text, para->length);
- pango_layout_set_justify (para->layout, page_layout->do_justify);
- pango_layout_set_alignment (para->layout,
- page_layout->pango_dir == PANGO_DIRECTION_LTR
- ? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT);
- pango_layout_set_width (para->layout, paint_width * PANGO_SCALE);
- if (page_layout->do_wordwrap)
- pango_layout_set_wrap (para->layout, PANGO_WRAP_WORD_CHAR);
- para->height = 0;
-
- if (wc == '\f')
- para->formfeed = 1;
- else
- para->formfeed = 0;
-
- last_para = next;
-
- result = g_list_prepend (result, para);
- }
- if (!wc) /* incomplete character at end */
- break;
- p = next;
- }
-
- return g_list_reverse (result);
-}
-#endif
-
/* Take a UTF8 string and break it into paragraphs on \n characters
*/
static GList *
@@ -905,18 +798,85 @@ split_text_into_paragraphs (PangoContext *pango_context,
para->text = last_para;
para->length = p - last_para;
para->layout = pango_layout_new (pango_context);
- // pango_layout_set_font_description (para->layout, font_description);
- pango_layout_set_text (para->layout, para->text, para->length);
+
+ if (page_layout->cpi > 0.0L && page_layout->do_wordwrap) {
+ /* figuring out the correct width from the pango_font_metrics_get_approximate_width()
+ * is really hard and pango_layout_set_wrap() doesn't work properly then.
+ * Those are not reliable to render the characters exactly according to the given CPI.
+ * So Re-calculate the width to wrap up to be comfortable with CPI.
+ */
+ wchar_t *wtext = NULL, *wnewtext = NULL;
+ gchar *newtext = NULL;
+ gsize len, col, i, wwidth = 0;
+ PangoRectangle ink_rect, logical_rect;
+
+ wtext = (wchar_t *)g_utf8_to_ucs4(para->text, para->length, NULL, NULL, NULL);
+ if (wtext == NULL) {
+ fprintf(stderr, "%s: Unable to convert UTF-8 to UCS-4.\n", g_get_prgname());
+ fail:
+ g_free(wtext);
+ g_free(wnewtext);
+ g_free(newtext);
+ if (page_layout->cups_mode) {
+ /* try to continue parsing text */
+ p = next;
+ continue;
+ } else {
+ exit(1);
+ }
+ }
+ len = g_utf8_strlen(para->text, para->length);
+ /* the amount of characters that can be put on the line against CPI */
+ col = page_layout->column_width / 72.0 * page_layout->cpi;
+ if (len > col) {
+ /* need to wrap up them */
+ wnewtext = g_new(wchar_t, wcslen(wtext) + 1);
+ if (wnewtext == NULL) {
+ fprintf(stderr, "%s: Unable to allocate the memory.\n", g_get_prgname());
+ goto fail;
+ }
+ for (i = 0; i < len; i++) {
+ wwidth += wcwidth(wtext[i]);
+ if (wwidth > col)
+ break;
+ wnewtext[i] = wtext[i];
+ }
+ wnewtext[i] = 0L;
+
+ newtext = g_ucs4_to_utf8((const gunichar *)wnewtext, i, NULL, NULL, NULL);
+ if (newtext == NULL) {
+ fprintf(stderr, "%s: Unable to convert UCS-4 to UTF-8.\n", g_get_prgname());
+ goto fail;
+ }
+ pango_layout_set_text(para->layout, newtext, -1);
+ pango_layout_get_extents(para->layout, &ink_rect, &logical_rect);
+ paint_width = logical_rect.width / PANGO_SCALE;
+ g_free(wnewtext);
+ g_free(newtext);
+
+ para->length = i;
+ next = g_utf8_offset_to_pointer(para->text, para->length);
+ wc = g_utf8_get_char(g_utf8_prev_char(next));
+ } else {
+ pango_layout_set_text(para->layout, para->text, para->length);
+ }
+ g_free(wtext);
+
+ pango_layout_set_width(para->layout, -1);
+ } else {
+ pango_layout_set_text (para->layout, para->text, para->length);
+ if (page_layout->do_wordwrap) {
+ pango_layout_set_wrap (para->layout, PANGO_WRAP_WORD_CHAR);
+ pango_layout_set_width (para->layout, paint_width * PANGO_SCALE);
+ } else {
+ pango_layout_set_width (para->layout, -1);
+ }
+ }
+
pango_layout_set_justify (para->layout, page_layout->do_justify);
pango_layout_set_alignment (para->layout,
page_layout->pango_dir == PANGO_DIRECTION_LTR
? PANGO_ALIGN_LEFT : PANGO_ALIGN_RIGHT);
- if (page_layout->do_wordwrap) {
- pango_layout_set_wrap (para->layout, PANGO_WRAP_WORD_CHAR);
- pango_layout_set_width (para->layout, paint_width * PANGO_SCALE);
- } else {
- pango_layout_set_width (para->layout, -1);
- }
para->height = 0;
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