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#define _WIN32_WINNT 0x500
#include "imw32.h"
#define STRICT
#include <windows.h>
#include "imext.h"
/*
=head1 NAME
win32.c - implements some win32 specific code, specifically Win32 font support.
=head1 SYNOPSIS
i_img_dim bbox[6];
if (i_wf_bbox(facename, size, text, text_len, bbox)) {
// we have the bbox
}
i_wf_text(face, im, tx, ty, cl, size, text, len, align, aa, utf8);
i_wf_cp(face, im, tx, ty, channel, size, text, len, align, aa, utf8)
=head1 DESCRIPTION
An Imager interface to font output using the Win32 GDI.
=over
=cut
*/
#define fixed(x) ((x).value + ((x).fract) / 65536.0)
static void set_logfont(const char *face, int size, LOGFONT *lf);
static unsigned char *render_text(const char *face, int size, const char *text, size_t length, int aa,
SIZE *psz, TEXTMETRIC *tm, size_t *bytes_per_line, i_img_dim *bbox, int utf8);
static LPWSTR utf8_to_wide_string(char const *text, int text_len, int *wide_chars);
static LPWSTR latin1_to_wide_string(char const *text, int text_len, int *wide_chars);
/*
=item i_wf_bbox(face, size, text, length, bbox, utf8)
Calculate a bounding box for the text.
=cut
*/
int i_wf_bbox(const char *face, i_img_dim size, const char *text, size_t length,
i_img_dim *bbox, int utf8) {
LOGFONT lf;
HFONT font, oldFont;
HDC dc;
SIZE sz;
TEXTMETRIC tm;
ABC first, last;
GLYPHMETRICS gm;
MAT2 mat;
int ascent, descent, max_ascent = -size, min_descent = size;
const char *workp;
size_t work_len;
int got_first_ch = 0;
unsigned long first_ch, last_ch;
i_clear_error();
mm_log((1, "i_wf_bbox(face %s, size %d, text %p, length %d, bbox %p, utf8 %d)\n", face, size, text, length, bbox, utf8));
set_logfont(face, size, &lf);
font = CreateFontIndirect(&lf);
if (!font)
return 0;
dc = GetDC(NULL);
oldFont = (HFONT)SelectObject(dc, font);
{
char facename[100];
if (GetTextFace(dc, sizeof(facename), facename)) {
mm_log((1, " face: %s\n", facename));
}
}
workp = text;
work_len = length;
while (work_len > 0) {
unsigned long c;
unsigned char cp;
if (utf8) {
c = i_utf8_advance(&workp, &work_len);
if (c == ~0UL) {
i_push_error(0, "invalid UTF8 character");
return 0;
}
}
else {
c = (unsigned char)*workp++;
--work_len;
}
if (!got_first_ch) {
first_ch = c;
++got_first_ch;
}
last_ch = c;
cp = c > '~' ? '.' : c < ' ' ? '.' : c;
memset(&mat, 0, sizeof(mat));
mat.eM11.value = 1;
mat.eM22.value = 1;
if (GetGlyphOutline(dc, (UINT)c, GGO_METRICS, &gm, 0, NULL, &mat) != GDI_ERROR) {
mm_log((2, " glyph '%c' (%02x): bbx (%u,%u) org (%d,%d) inc(%d,%d)\n",
cp, c, gm.gmBlackBoxX, gm.gmBlackBoxY, gm.gmptGlyphOrigin.x,
gm.gmptGlyphOrigin.y, gm.gmCellIncX, gm.gmCellIncY));
ascent = gm.gmptGlyphOrigin.y;
descent = ascent - gm.gmBlackBoxY;
if (ascent > max_ascent) max_ascent = ascent;
if (descent < min_descent) min_descent = descent;
}
else {
mm_log((1, " glyph '%c' (%02x): error %d\n", cp, c, GetLastError()));
}
}
if (utf8) {
int wide_chars;
LPWSTR wide_text = utf8_to_wide_string(text, length, &wide_chars);
if (!wide_text)
return 0;
if (!GetTextExtentPoint32W(dc, wide_text, wide_chars, &sz)
|| !GetTextMetrics(dc, &tm)) {
SelectObject(dc, oldFont);
ReleaseDC(NULL, dc);
DeleteObject(font);
return 0;
}
myfree(wide_text);
}
else {
if (!GetTextExtentPoint32(dc, text, length, &sz)
|| !GetTextMetrics(dc, &tm)) {
SelectObject(dc, oldFont);
ReleaseDC(NULL, dc);
DeleteObject(font);
return 0;
}
}
bbox[BBOX_GLOBAL_DESCENT] = -tm.tmDescent;
bbox[BBOX_DESCENT] = min_descent == size ? -tm.tmDescent : min_descent;
bbox[BBOX_POS_WIDTH] = sz.cx;
bbox[BBOX_ADVANCE_WIDTH] = sz.cx;
bbox[BBOX_GLOBAL_ASCENT] = tm.tmAscent;
bbox[BBOX_ASCENT] = max_ascent == -size ? tm.tmAscent : max_ascent;
if (length
&& GetCharABCWidths(dc, first_ch, first_ch, &first)
&& GetCharABCWidths(dc, last_ch, last_ch, &last)) {
mm_log((1, "first: %d A: %d B: %d C: %d\n", first_ch,
first.abcA, first.abcB, first.abcC));
mm_log((1, "last: %d A: %d B: %d C: %d\n", last_ch,
last.abcA, last.abcB, last.abcC));
bbox[BBOX_NEG_WIDTH] = first.abcA;
bbox[BBOX_RIGHT_BEARING] = last.abcC;
if (last.abcC < 0)
bbox[BBOX_POS_WIDTH] -= last.abcC;
}
else {
bbox[BBOX_NEG_WIDTH] = 0;
bbox[BBOX_RIGHT_BEARING] = 0;
}
SelectObject(dc, oldFont);
ReleaseDC(NULL, dc);
DeleteObject(font);
mm_log((1, " bbox=> negw=%" i_DF " glob_desc=%" i_DF " pos_wid=%" i_DF
" glob_asc=%" i_DF " desc=%" i_DF " asc=%" i_DF " adv_width=%" i_DF
" rightb=%" i_DF "\n", i_DFc(bbox[0]), i_DFc(bbox[1]), i_DFc(bbox[2]),
i_DFc(bbox[3]), i_DFc(bbox[4]), i_DFc(bbox[5]), i_DFc(bbox[6]),
i_DFc(bbox[7])));
return BBOX_RIGHT_BEARING + 1;
}
/*
=item i_wf_text(face, im, tx, ty, cl, size, text, len, align, aa)
Draws the text in the given color.
=cut
*/
int
i_wf_text(const char *face, i_img *im, i_img_dim tx, i_img_dim ty, const i_color *cl, i_img_dim size,
const char *text, size_t len, int align, int aa, int utf8) {
unsigned char *bits;
SIZE sz;
size_t line_width;
i_img_dim x, y;
int ch;
TEXTMETRIC tm;
int top;
i_img_dim bbox[BOUNDING_BOX_COUNT];
i_render *r;
unsigned char *outp;
i_clear_error();
mm_log((1, "i_wf_text(face %s, im %p, tx %" i_DF ", ty %" i_DF ", cl %p, size %" i_DF ", text %p, length %lu, align %d, aa %d, utf8 %d)\n", face, im, i_DFcp(tx, ty), cl, i_DFc(size), text, (unsigned long)len, align, aa, aa, utf8));
if (!i_wf_bbox(face, size, text, len, bbox, utf8))
return 0;
bits = render_text(face, size, text, len, aa, &sz, &tm, &line_width, bbox, utf8);
if (!bits)
return 0;
tx += bbox[BBOX_NEG_WIDTH];
top = ty;
if (align) {
top -= tm.tmAscent;
}
else {
top -= tm.tmAscent - bbox[BBOX_ASCENT];
}
r = i_render_new(im, sz.cx);
outp = bits;
for (y = 0; y < sz.cy; ++y) {
i_render_color(r, tx, top + sz.cy - y - 1, sz.cx, outp, cl);
outp += line_width;
}
i_render_delete(r);
myfree(bits);
return 1;
}
/*
=item i_wf_cp(face, im, tx, ty, channel, size, text, len, align, aa)
Draws the text in the given channel.
=cut
*/
int
i_wf_cp(const char *face, i_img *im, i_img_dim tx, i_img_dim ty, int channel, i_img_dim size,
const char *text, size_t len, int align, int aa, int utf8) {
unsigned char *bits;
SIZE sz;
size_t line_width;
i_img_dim x, y;
TEXTMETRIC tm;
i_img_dim top;
i_img_dim bbox[BOUNDING_BOX_COUNT];
unsigned char *outp;
i_clear_error();
mm_log((1, "i_wf_cp(face %s, im %p, tx %" i_DF ", ty %" i_DF ", channel %d, size %" i_DF ", text %p, length %lu, align %d, aa %d, utf8 %d)\n", face, im, i_DFcp(tx, ty), channel, i_DFc(size), text, (unsigned long)len, align, aa, aa, utf8));
if (!i_wf_bbox(face, size, text, len, bbox, utf8))
return 0;
bits = render_text(face, size, text, len, aa, &sz, &tm, &line_width, bbox, utf8);
if (!bits)
return 0;
top = ty;
if (align) {
top -= tm.tmAscent;
}
else {
top -= tm.tmAscent - bbox[BBOX_ASCENT];
}
outp = bits;
for (y = 0; y < sz.cy; ++y) {
for (x = 0; x < sz.cx; ++x) {
i_color pel;
int scale = outp[x];
i_gpix(im, tx+x, top+sz.cy-y-1, &pel);
pel.channel[channel] = scale;
i_ppix(im, tx+x, top+sz.cy-y-1, &pel);
}
outp += line_width;
}
myfree(bits);
return 1;
}
static HMODULE gdi_dll;
typedef BOOL (CALLBACK *AddFontResourceExA_t)(LPCSTR, DWORD, PVOID);
static AddFontResourceExA_t AddFontResourceExAp;
typedef BOOL (CALLBACK *RemoveFontResourceExA_t)(LPCSTR, DWORD, PVOID);
static RemoveFontResourceExA_t RemoveFontResourceExAp;
/*
=item i_wf_addfont(char const *filename, char const *resource_file)
Adds a TTF font file as usable by the application.
Where possible the font is added as private to the application.
Under Windows 95/98/ME the font is added globally, since we don't have
any choice. In either case call i_wf_delfont() to remove it.
=cut
*/
int
i_wf_addfont(char const *filename) {
i_clear_error();
mm_log((1, "i_wf_addfont(%s)\n", filename));
if (!gdi_dll) {
gdi_dll = GetModuleHandle("GDI32");
if (gdi_dll) {
AddFontResourceExAp = (AddFontResourceExA_t)GetProcAddress(gdi_dll, "AddFontResourceExA");
RemoveFontResourceExAp = (RemoveFontResourceExA_t)GetProcAddress(gdi_dll, "RemoveFontResourceExA");
mm_log((1, "i_wf_addfont: AddFontResourceExA %p RemoveFontResourceExA %p\n",
AddFontResourceExAp, RemoveFontResourceExAp));
}
}
if (AddFontResourceExAp && RemoveFontResourceExAp) {
mm_log((1, "i_wf_addfont: adding via AddFontResourceEx()\n"));
if (AddFontResourceExAp(filename, FR_PRIVATE, 0)) {
return 1;
}
}
else {
mm_log((1, "i_wf_addfont: adding via AddFontResource()\n"));
if (AddFontResource(filename)) {
return 1;
}
}
mm_log((1, "i_wf_addfont failed: %ld\n", GetLastError()));
i_push_errorf(0, "Could not add resource: %ld", GetLastError());
return 0;
}
/*
=item i_wf_delfont(char const *filename, char const *resource_file)
Deletes a TTF font file as usable by the application.
=cut
*/
int
i_wf_delfont(char const *filename) {
i_clear_error();
mm_log((1, "i_wf_delfont(%s)\n", filename));
if (AddFontResourceExAp && RemoveFontResourceExAp) {
mm_log((1, "i_wf_delfont: removing via RemoveFontResourceEx()\n"));
if (RemoveFontResourceExAp(filename, FR_PRIVATE, 0))
return 1;
}
else {
mm_log((1, "i_wf_delfont: adding via RemoveFontResourceEx()\n"));
if (RemoveFontResource(filename))
return 1;
}
mm_log((1, "i_wf_delfont failed: %ld\n", GetLastError()));
i_push_errorf(0, "Could not remove resource: %ld", GetLastError());
return 0;
}
/*
=back
=head1 INTERNAL FUNCTIONS
=over
=item set_logfont(face, size, lf)
Fills in a LOGFONT structure with reasonable defaults.
=cut
*/
static void set_logfont(const char *face, int size, LOGFONT *lf) {
memset(lf, 0, sizeof(LOGFONT));
lf->lfHeight = -size; /* character height rather than cell height */
lf->lfCharSet = DEFAULT_CHARSET;
lf->lfOutPrecision = OUT_TT_PRECIS;
lf->lfClipPrecision = CLIP_DEFAULT_PRECIS;
lf->lfQuality = PROOF_QUALITY;
strncpy(lf->lfFaceName, face, sizeof(lf->lfFaceName)-1);
/* NUL terminated by the memset at the top */
}
/*
=item render_text(face, size, text, length, aa, pbm, psz, tm)
renders the text to an in-memory RGB bitmap
It would be nice to render to greyscale, but Windows doesn't have
native greyscale bitmaps.
=cut
*/
static unsigned char *
render_text(const char *face, int size, const char *text, size_t length, int aa,
SIZE *psz, TEXTMETRIC *tm, size_t *bytes_per_line, i_img_dim *bbox, int utf8) {
BITMAPINFO bmi;
BITMAPINFOHEADER *bmih = &bmi.bmiHeader;
HDC dc, bmpDc;
LOGFONT lf;
HFONT font, oldFont;
SIZE sz;
HBITMAP bm, oldBm;
LPVOID bits;
int wide_count;
LPWSTR wide_text;
unsigned char *result;
dc = GetDC(NULL);
set_logfont(face, size, &lf);
#ifdef ANTIALIASED_QUALITY
/* See KB article Q197076
"INFO: Controlling Anti-aliased Text via the LOGFONT Structure"
*/
lf.lfQuality = aa ? ANTIALIASED_QUALITY : NONANTIALIASED_QUALITY;
#endif
if (utf8) {
wide_text = utf8_to_wide_string(text, length, &wide_count);
}
else {
wide_text = latin1_to_wide_string(text, length, &wide_count);
}
bmpDc = CreateCompatibleDC(dc);
if (bmpDc) {
font = CreateFontIndirect(&lf);
if (font) {
oldFont = SelectObject(bmpDc, font);
GetTextMetrics(bmpDc, tm);
sz.cx = bbox[BBOX_ADVANCE_WIDTH] - bbox[BBOX_NEG_WIDTH] + bbox[BBOX_POS_WIDTH];
sz.cy = bbox[BBOX_GLOBAL_ASCENT] - bbox[BBOX_GLOBAL_DESCENT];
memset(&bmi, 0, sizeof(bmi));
bmih->biSize = sizeof(*bmih);
bmih->biWidth = sz.cx;
bmih->biHeight = sz.cy;
bmih->biPlanes = 1;
bmih->biBitCount = 24;
bmih->biCompression = BI_RGB;
bmih->biSizeImage = 0;
bmih->biXPelsPerMeter = (LONG)(72 / 2.54 * 100);
bmih->biYPelsPerMeter = bmih->biXPelsPerMeter;
bmih->biClrUsed = 0;
bmih->biClrImportant = 0;
bm = CreateDIBSection(dc, &bmi, DIB_RGB_COLORS, &bits, NULL, 0);
if (bm) {
oldBm = SelectObject(bmpDc, bm);
SetTextColor(bmpDc, RGB(255, 255, 255));
SetBkColor(bmpDc, RGB(0, 0, 0));
TextOutW(bmpDc, -bbox[BBOX_NEG_WIDTH], 0, wide_text, wide_count);
SelectObject(bmpDc, oldBm);
}
else {
i_push_errorf(0, "Could not create DIB section for render: %ld",
GetLastError());
SelectObject(bmpDc, oldFont);
DeleteObject(font);
DeleteDC(bmpDc);
ReleaseDC(NULL, dc);
myfree(wide_text);
return NULL;
}
SelectObject(bmpDc, oldFont);
DeleteObject(font);
}
else {
myfree(wide_text);
i_push_errorf(0, "Could not create logical font: %ld",
GetLastError());
DeleteDC(bmpDc);
ReleaseDC(NULL, dc);
return NULL;
}
DeleteDC(bmpDc);
}
else {
myfree(wide_text);
i_push_errorf(0, "Could not create rendering DC: %ld", GetLastError());
ReleaseDC(NULL, dc);
return NULL;
}
myfree(wide_text);
ReleaseDC(NULL, dc);
*psz = sz;
/* convert into a map we can just pass to i_render_color() */
{
i_img_dim x, y;
unsigned char *outp, *ucbits;
size_t bits_line_width;
*bytes_per_line = sz.cx;
result = mymalloc(sz.cx * sz.cy);
outp = result;
ucbits = bits;
bits_line_width = sz.cx * 3;
bits_line_width = (bits_line_width + 3) / 4 * 4;
for (y = 0; y < sz.cy; ++y) {
for (x = 0; x < sz.cx; ++x) {
*outp++ = ucbits[3 * x];
}
ucbits += bits_line_width;
}
}
DeleteObject(bm);
return result;
}
/*
=item utf8_to_wide_string(text, text_len, wide_chars)
=cut
*/
static
LPWSTR
utf8_to_wide_string(char const *text, int text_len, int *wide_chars) {
int wide_count = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, text, text_len, NULL, 0);
LPWSTR result;
if (wide_count < 0) {
i_push_errorf(0, "Could not convert utf8: %ld", GetLastError());
return NULL;
}
++wide_count;
result = mymalloc(sizeof(WCHAR) * wide_count);
if (MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, text, text_len, result, wide_count) < 0) {
i_push_errorf(0, "Could not convert utf8: %ld", GetLastError());
return NULL;
}
result[wide_count-1] = (WCHAR)'\0';
*wide_chars = wide_count - 1;
return result;
}
static LPWSTR
latin1_to_wide_string(char const *text, int text_len, int *wide_chars) {
LPWSTR result = mymalloc(sizeof(WCHAR) * (text_len + 1));
size_t i;
for (i = 0; i < text_len; ++i) {
result[i] = (unsigned char)text[i];
}
result[i] = 0;
*wide_chars = text_len;
return result;
}
/*
=back
=head1 BUGS
Should really use a structure so we can set more attributes.
Should support UTF8
=head1 AUTHOR
Tony Cook <tony@develop-help.com>
=head1 SEE ALSO
Imager(3)
=cut
*/