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fix win32 font measurement of non ascii strings. 

This greatly improves line breaking and font measurement in the
windows frontend.
This commit is contained in:
Vincent Sanders 2019-12-14 12:51:59 +00:00
parent 4c68def432
commit f081ffb7e8
1 changed files with 123 additions and 99 deletions
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222
frontends/windows/font.c
View File

@ -93,23 +93,31 @@ HFONT get_font(const plot_font_style_t *style)
{
char *face = NULL;
DWORD family;
int nHeight;
HDC hdc;
HFONT font;
switch(style->family) {
case PLOT_FONT_FAMILY_SERIF:
face = strdup(nsoption_charp(font_serif));
family = FF_ROMAN | DEFAULT_PITCH;
break;
case PLOT_FONT_FAMILY_MONOSPACE:
face = strdup(nsoption_charp(font_mono));
family = FF_MODERN | DEFAULT_PITCH;
break;
case PLOT_FONT_FAMILY_CURSIVE:
face = strdup(nsoption_charp(font_cursive));
family = FF_SCRIPT | DEFAULT_PITCH;
break;
case PLOT_FONT_FAMILY_FANTASY:
face = strdup(nsoption_charp(font_fantasy));
family = FF_DECORATIVE | DEFAULT_PITCH;
break;
case PLOT_FONT_FAMILY_SANS_SERIF:
default:
face = strdup(nsoption_charp(font_sans));
@ -117,30 +125,30 @@ HFONT get_font(const plot_font_style_t *style)
break;
}
int nHeight = -10;
nHeight = -10;
HDC hdc = GetDC(font_hwnd);
hdc = GetDC(font_hwnd);
nHeight = -MulDiv(style->size, GetDeviceCaps(hdc, LOGPIXELSY), 72 * PLOT_STYLE_SCALE);
ReleaseDC(font_hwnd, hdc);
HFONT font = CreateFont(
nHeight, /* height */
0, /* width */
0, /* escapement*/
0, /* orientation */
style->weight,
(style->flags & FONTF_ITALIC) ? TRUE : FALSE,
FALSE, /* underline */
FALSE, /* strike */
DEFAULT_CHARSET, /* for locale */
OUT_DEFAULT_PRECIS, /* general 'best match' */
CLIP_DEFAULT_PRECIS,
DEFAULT_QUALITY,
family,
face /* name of font face */
);
if (face != NULL)
font = CreateFont(nHeight, /* height */
0, /* width */
0, /* escapement*/
0, /* orientation */
style->weight,
(style->flags & FONTF_ITALIC) ? TRUE : FALSE,
FALSE, /* underline */
FALSE, /* strike */
DEFAULT_CHARSET, /* for locale */
OUT_DEFAULT_PRECIS, /* general 'best match' */
CLIP_DEFAULT_PRECIS,
DEFAULT_QUALITY,
family,
face); /* name of font face */
if (face != NULL) {
free(face);
}
if (font == NULL) {
if (style->family == PLOT_FONT_FAMILY_MONOSPACE) {
@ -149,50 +157,67 @@ HFONT get_font(const plot_font_style_t *style)
font = (HFONT) GetStockObject(ANSI_VAR_FONT);
}
}
if (font == NULL)
if (font == NULL) {
font = (HFONT) GetStockObject(SYSTEM_FONT);
}
return font;
}
/* size of temporary wide character string for computing string width */
#define WSTRLEN 4096
/**
* Measure the width of a string.
*
* \param[in] style plot style for this text
* \param[in] string UTF-8 string to measure
* \param[in] length length of string, in bytes
* \param[in] utf8str string encoded in UTF-8 to measure
* \param[in] utf8len length of string, in bytes
* \param[out] width updated to width of string[0..length)
* \return NSERROR_OK on success otherwise appropriate error code
*/
static nserror
win32_font_width(const plot_font_style_t *style,
const char *string,
size_t length,
const char *utf8str,
size_t utf8len,
int *width)
{
nserror ret = NSERROR_OK;
HDC hdc;
HFONT font;
HFONT fontbak;
SIZE s;
nserror ret = NSERROR_OK;
SIZE sizl; /* size in logical units */
BOOL wres;
int wclen; /* wide char length */
static WCHAR wstr[WSTRLEN]; /* temporary wide char string */
if (length == 0) {
if (utf8len == 0) {
*width = 0;
} else {
hdc = GetDC(NULL);
font = get_font(style);
fontbak = SelectObject(hdc, font);
/* may well need to convert utf-8 to lpctstr */
if (GetTextExtentPoint32A(hdc, string, length, &s) != 0) {
*width = s.cx;
} else {
ret = NSERROR_UNKNOWN;
}
font = SelectObject(hdc, fontbak);
DeleteObject(font);
ReleaseDC(NULL, hdc);
return ret;
}
hdc = GetDC(NULL);
font = get_font(style);
fontbak = SelectObject(hdc, font);
wclen = MultiByteToWideChar(CP_UTF8, 0, utf8str, utf8len, wstr, WSTRLEN);
if (wclen != 0) {
wres = GetTextExtentPoint32W(hdc, wstr, wclen, &sizl);
if (wres == FALSE) {
ret = NSERROR_INVALID;
} else {
*width = sizl.cx;
}
} else {
ret = NSERROR_NOSPACE;
}
font = SelectObject(hdc, fontbak);
DeleteObject(font);
ReleaseDC(NULL, hdc);
return ret;
}
@ -200,19 +225,19 @@ win32_font_width(const plot_font_style_t *style,
/**
* Find the position in a string where an x coordinate falls.
*
* \param style css_style for this text, with style->font_size.size ==
* \param style css_style for this text, with style->font_size.size ==
* CSS_FONT_SIZE_LENGTH
* \param string UTF-8 string to measure
* \param length length of string
* \param x x coordinate to search for
* \param char_offset updated to offset in string of actual_x, [0..length]
* \param actual_x updated to x coordinate of character closest to x
* \param utf8str string to measure encoded in UTF-8
* \param utf8len length of string
* \param x coordinate to search for
* \param char_offset updated to offset in string of actual_x, [0..length]
* \param actual_x updated to x coordinate of character closest to x
* \return NSERROR_OK on success otherwise appropriate error code
*/
static nserror
win32_font_position(const plot_font_style_t *style,
const char *string,
size_t length,
const char *utf8str,
size_t utf8len,
int x,
size_t *char_offset,
int *actual_x)
@ -224,26 +249,29 @@ win32_font_position(const plot_font_style_t *style,
int offset;
nserror ret = NSERROR_OK;
if ((length == 0) || (x < 1)) {
/* deal with zero length input or invalid search co-ordiate */
if ((utf8len == 0) || (x < 1)) {
*char_offset = 0;
*actual_x = 0;
} else {
hdc = GetDC(NULL);
font = get_font(style);
fontbak = SelectObject(hdc, font);
if ((GetTextExtentExPointA(hdc, string, length, x, &offset, NULL,&s) != 0) &&
(GetTextExtentPoint32A(hdc, string, offset, &s) != 0)) {
*char_offset = (size_t)offset;
*actual_x = s.cx;
} else {
ret = NSERROR_UNKNOWN;
}
font = SelectObject(hdc, fontbak);
DeleteObject(font);
ReleaseDC(NULL, hdc);
return ret;
}
hdc = GetDC(NULL);
font = get_font(style);
fontbak = SelectObject(hdc, font);
if ((GetTextExtentExPointA(hdc, utf8str, utf8len, x, &offset, NULL, &s) != 0) &&
(GetTextExtentPoint32A(hdc, utf8str, offset, &s) != 0)) {
*char_offset = (size_t)offset;
*actual_x = s.cx;
} else {
ret = NSERROR_UNKNOWN;
}
font = SelectObject(hdc, fontbak);
DeleteObject(font);
ReleaseDC(NULL, hdc);
return ret;
}
@ -256,7 +284,7 @@ win32_font_position(const plot_font_style_t *style,
* \param string UTF-8 string to measure
* \param length length of string
* \param x width available
* \param char_offset updated to offset in string of actual_x, [0..length]
* \param[out] offset updated to offset in string of actual_x, [0..length]
* \param actual_x updated to x coordinate of character closest to x
* \return NSERROR_OK on success otherwise appropriate error code
*
@ -269,52 +297,48 @@ win32_font_split(const plot_font_style_t *style,
const char *string,
size_t length,
int x,
size_t *char_offset,
size_t *offset,
int *actual_x)
{
nserror res;
int c_off;
nserror ret = NSERROR_UNKNOWN;
if (win32_font_position(style,
string,
length,
x,
char_offset,
actual_x) == NSERROR_OK) {
c_off = *char_offset;
if (*char_offset == length) {
ret = NSERROR_OK;
} else {
bool success;
while ((string[*char_offset] != ' ') &&
(*char_offset > 0)) {
(*char_offset)--;
}
/* get the offset into teh string on the proposed position */
res = win32_font_position(style, string, length, x, offset, actual_x);
if (res != NSERROR_OK) {
return res;
}
if (*char_offset == 0) {
*char_offset = c_off;
while ((*char_offset < length) &&
(string[*char_offset] != ' ')) {
(*char_offset)++;
}
}
/* return the whole string fits in the proposed length */
if (*offset == length) {
return NSERROR_OK;
}
success = win32_font_width(style,
string,
*char_offset,
actual_x);
if (success) {
ret = NSERROR_OK;
}
c_off = *offset;
/* walk backwards through string looking for space to break on */
while ((string[*offset] != ' ') &&
(*offset > 0)) {
(*offset)--;
}
/* walk forwards through string looking for space if back failed */
if (*offset == 0) {
*offset = c_off;
while ((*offset < length) &&
(string[*offset] != ' ')) {
(*offset)++;
}
}
/* find the actual string width of the break */
res = win32_font_width(style, string, *offset, actual_x);
NSLOG(netsurf, DEEPDEBUG,
"ret %d Split %u chars at %ipx: Split at char %i (%ipx) - %.*s",
ret, length, x, *char_offset, *actual_x, *char_offset, string);
res, length, x, *offset, *actual_x, *offset, string);
return ret;
return res;
}