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reactos/dll/opengl/opengl32/wgl_font.c

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/* Window-specific OpenGL functions implementation.
*
* Copyright (c) 1999 Lionel Ulmer
* Copyright (c) 2005 Raphael Junqueira
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "opengl32.h"
#include <math.h>
WINE_DEFAULT_DEBUG_CHANNEL(wgl);
/***********************************************************************
* wglUseFontBitmaps_common
*/
static BOOL wglUseFontBitmaps_common( HDC hdc, DWORD first, DWORD count, DWORD listBase, BOOL unicode )
{
const GLDISPATCHTABLE * funcs = IntGetCurrentDispatchTable();
GLYPHMETRICS gm;
unsigned int glyph, size = 0;
void *bitmap = NULL, *gl_bitmap = NULL;
int org_alignment;
BOOL ret = TRUE;
funcs->GetIntegerv(GL_UNPACK_ALIGNMENT, &org_alignment);
funcs->PixelStorei(GL_UNPACK_ALIGNMENT, 4);
for (glyph = first; glyph < first + count; glyph++) {
static const MAT2 identity = { {0,1},{0,0},{0,0},{0,1} };
unsigned int needed_size, height, width, width_int;
if (unicode)
needed_size = GetGlyphOutlineW(hdc, glyph, GGO_BITMAP, &gm, 0, NULL, &identity);
else
needed_size = GetGlyphOutlineA(hdc, glyph, GGO_BITMAP, &gm, 0, NULL, &identity);
TRACE("Glyph: %3d / List: %d size %d\n", glyph, listBase, needed_size);
if (needed_size == GDI_ERROR) {
ret = FALSE;
break;
}
if (needed_size > size) {
size = needed_size;
HeapFree(GetProcessHeap(), 0, bitmap);
HeapFree(GetProcessHeap(), 0, gl_bitmap);
bitmap = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size);
gl_bitmap = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, size);
}
if (unicode)
ret = (GetGlyphOutlineW(hdc, glyph, GGO_BITMAP, &gm, size, bitmap, &identity) != GDI_ERROR);
else
ret = (GetGlyphOutlineA(hdc, glyph, GGO_BITMAP, &gm, size, bitmap, &identity) != GDI_ERROR);
if (!ret) break;
if (TRACE_ON(wgl)) {
unsigned int bitmask;
unsigned char *bitmap_ = bitmap;
TRACE(" - bbox: %d x %d\n", gm.gmBlackBoxX, gm.gmBlackBoxY);
TRACE(" - origin: (%d, %d)\n", gm.gmptGlyphOrigin.x, gm.gmptGlyphOrigin.y);
TRACE(" - increment: %d - %d\n", gm.gmCellIncX, gm.gmCellIncY);
if (needed_size != 0) {
TRACE(" - bitmap:\n");
for (height = 0; height < gm.gmBlackBoxY; height++) {
TRACE(" ");
for (width = 0, bitmask = 0x80; width < gm.gmBlackBoxX; width++, bitmask >>= 1) {
if (bitmask == 0) {
bitmap_ += 1;
bitmask = 0x80;
}
if (*bitmap_ & bitmask)
TRACE("*");
else
TRACE(" ");
}
bitmap_ += (4 - ((UINT_PTR)bitmap_ & 0x03));
TRACE("\n");
}
}
}
/* In OpenGL, the bitmap is drawn from the bottom to the top... So we need to invert the
* glyph for it to be drawn properly.
*/
if (needed_size != 0) {
width_int = (gm.gmBlackBoxX + 31) / 32;
for (height = 0; height < gm.gmBlackBoxY; height++) {
for (width = 0; width < width_int; width++) {
((int *) gl_bitmap)[(gm.gmBlackBoxY - height - 1) * width_int + width] =
((int *) bitmap)[height * width_int + width];
}
}
}
funcs->NewList(listBase++, GL_COMPILE);
if (needed_size != 0) {
funcs->Bitmap(gm.gmBlackBoxX, gm.gmBlackBoxY,
0 - gm.gmptGlyphOrigin.x, (int) gm.gmBlackBoxY - gm.gmptGlyphOrigin.y,
gm.gmCellIncX, gm.gmCellIncY,
gl_bitmap);
} else {
/* This is the case of 'empty' glyphs like the space character */
funcs->Bitmap(0, 0, 0, 0, gm.gmCellIncX, gm.gmCellIncY, NULL);
}
funcs->EndList();
}
funcs->PixelStorei(GL_UNPACK_ALIGNMENT, org_alignment);
HeapFree(GetProcessHeap(), 0, bitmap);
HeapFree(GetProcessHeap(), 0, gl_bitmap);
return ret;
}
/***********************************************************************
* wglUseFontBitmapsA (OPENGL32.@)
*/
BOOL WINAPI wglUseFontBitmapsA(HDC hdc, DWORD first, DWORD count, DWORD listBase)
{
return wglUseFontBitmaps_common( hdc, first, count, listBase, FALSE );
}
/***********************************************************************
* wglUseFontBitmapsW (OPENGL32.@)
*/
BOOL WINAPI wglUseFontBitmapsW(HDC hdc, DWORD first, DWORD count, DWORD listBase)
{
return wglUseFontBitmaps_common( hdc, first, count, listBase, TRUE );
}
/* FIXME: should probably have a glu.h header */
typedef struct GLUtesselator GLUtesselator;
typedef void (WINAPI *_GLUfuncptr)(void);
#define GLU_TESS_BEGIN 100100
#define GLU_TESS_VERTEX 100101
#define GLU_TESS_END 100102
static GLUtesselator * (WINAPI *pgluNewTess)(void);
static void (WINAPI *pgluDeleteTess)(GLUtesselator *tess);
static void (WINAPI *pgluTessNormal)(GLUtesselator *tess, GLdouble x, GLdouble y, GLdouble z);
static void (WINAPI *pgluTessBeginPolygon)(GLUtesselator *tess, void *polygon_data);
static void (WINAPI *pgluTessEndPolygon)(GLUtesselator *tess);
static void (WINAPI *pgluTessCallback)(GLUtesselator *tess, GLenum which, _GLUfuncptr fn);
static void (WINAPI *pgluTessBeginContour)(GLUtesselator *tess);
static void (WINAPI *pgluTessEndContour)(GLUtesselator *tess);
static void (WINAPI *pgluTessVertex)(GLUtesselator *tess, GLdouble *location, GLvoid* data);
static HMODULE load_libglu(void)
{
static const WCHAR glu32W[] = {'g','l','u','3','2','.','d','l','l',0};
static int already_loaded;
static HMODULE module;
if (already_loaded) return module;
already_loaded = 1;
TRACE("Trying to load GLU library\n");
module = LoadLibraryW( glu32W );
if (!module)
{
WARN("Failed to load glu32\n");
return NULL;
}
#define LOAD_FUNCPTR(f) p##f = (void *)GetProcAddress( module, #f )
LOAD_FUNCPTR(gluNewTess);
LOAD_FUNCPTR(gluDeleteTess);
LOAD_FUNCPTR(gluTessBeginContour);
LOAD_FUNCPTR(gluTessNormal);
LOAD_FUNCPTR(gluTessBeginPolygon);
LOAD_FUNCPTR(gluTessCallback);
LOAD_FUNCPTR(gluTessEndContour);
LOAD_FUNCPTR(gluTessEndPolygon);
LOAD_FUNCPTR(gluTessVertex);
#undef LOAD_FUNCPTR
return module;
}
static void fixed_to_double(POINTFX fixed, UINT em_size, GLdouble vertex[3])
{
vertex[0] = (fixed.x.value + (GLdouble)fixed.x.fract / (1 << 16)) / em_size;
vertex[1] = (fixed.y.value + (GLdouble)fixed.y.fract / (1 << 16)) / em_size;
vertex[2] = 0.0;
}
static void WINAPI tess_callback_vertex(GLvoid *vertex)
{
const GLDISPATCHTABLE * funcs = IntGetCurrentDispatchTable();
GLdouble *dbl = vertex;
TRACE("%f, %f, %f\n", dbl[0], dbl[1], dbl[2]);
funcs->Vertex3dv(vertex);
}
static void WINAPI tess_callback_begin(GLenum which)
{
const GLDISPATCHTABLE * funcs = IntGetCurrentDispatchTable();
TRACE("%d\n", which);
funcs->Begin(which);
}
static void WINAPI tess_callback_end(void)
{
const GLDISPATCHTABLE * funcs = IntGetCurrentDispatchTable();
TRACE("\n");
funcs->End();
}
typedef struct _bezier_vector {
GLdouble x;
GLdouble y;
} bezier_vector;
static double bezier_deviation_squared(const bezier_vector *p)
{
bezier_vector deviation;
bezier_vector vertex;
bezier_vector base;
double base_length;
double dot;
vertex.x = (p[0].x + p[1].x*2 + p[2].x)/4 - p[0].x;
vertex.y = (p[0].y + p[1].y*2 + p[2].y)/4 - p[0].y;
base.x = p[2].x - p[0].x;
base.y = p[2].y - p[0].y;
base_length = sqrt(base.x*base.x + base.y*base.y);
base.x /= base_length;
base.y /= base_length;
dot = base.x*vertex.x + base.y*vertex.y;
dot = min(max(dot, 0.0), base_length);
base.x *= dot;
base.y *= dot;
deviation.x = vertex.x-base.x;
deviation.y = vertex.y-base.y;
return deviation.x*deviation.x + deviation.y*deviation.y;
}
static int bezier_approximate(const bezier_vector *p, bezier_vector *points, FLOAT deviation)
{
bezier_vector first_curve[3];
bezier_vector second_curve[3];
bezier_vector vertex;
int total_vertices;
if(bezier_deviation_squared(p) <= deviation*deviation)
{
if(points)
*points = p[2];
return 1;
}
vertex.x = (p[0].x + p[1].x*2 + p[2].x)/4;
vertex.y = (p[0].y + p[1].y*2 + p[2].y)/4;
first_curve[0] = p[0];
first_curve[1].x = (p[0].x + p[1].x)/2;
first_curve[1].y = (p[0].y + p[1].y)/2;
first_curve[2] = vertex;
second_curve[0] = vertex;
second_curve[1].x = (p[2].x + p[1].x)/2;
second_curve[1].y = (p[2].y + p[1].y)/2;
second_curve[2] = p[2];
total_vertices = bezier_approximate(first_curve, points, deviation);
if(points)
points += total_vertices;
total_vertices += bezier_approximate(second_curve, points, deviation);
return total_vertices;
}
/***********************************************************************
* wglUseFontOutlines_common
*/
static BOOL wglUseFontOutlines_common(HDC hdc,
DWORD first,
DWORD count,
DWORD listBase,
FLOAT deviation,
FLOAT extrusion,
int format,
LPGLYPHMETRICSFLOAT lpgmf,
BOOL unicode)
{
const GLDISPATCHTABLE * funcs = IntGetCurrentDispatchTable();
UINT glyph;
const MAT2 identity = {{0,1},{0,0},{0,0},{0,1}};
GLUtesselator *tess = NULL;
LOGFONTW lf;
HFONT old_font, unscaled_font;
UINT em_size = 1024;
RECT rc;
TRACE("(%p, %d, %d, %d, %f, %f, %d, %p, %s)\n", hdc, first, count,
listBase, deviation, extrusion, format, lpgmf, unicode ? "W" : "A");
if(deviation <= 0.0)
deviation = 1.0/em_size;
if(format == WGL_FONT_POLYGONS)
{
if (!load_libglu())
{
ERR("glu32 is required for this function but isn't available\n");
return FALSE;
}
tess = pgluNewTess();
if(!tess) return FALSE;
pgluTessCallback(tess, GLU_TESS_VERTEX, (_GLUfuncptr)tess_callback_vertex);
pgluTessCallback(tess, GLU_TESS_BEGIN, (_GLUfuncptr)tess_callback_begin);
pgluTessCallback(tess, GLU_TESS_END, tess_callback_end);
}
GetObjectW(GetCurrentObject(hdc, OBJ_FONT), sizeof(lf), &lf);
rc.left = rc.right = rc.bottom = 0;
rc.top = em_size;
DPtoLP(hdc, (POINT*)&rc, 2);
lf.lfHeight = -abs(rc.top - rc.bottom);
lf.lfOrientation = lf.lfEscapement = 0;
unscaled_font = CreateFontIndirectW(&lf);
old_font = SelectObject(hdc, unscaled_font);
for (glyph = first; glyph < first + count; glyph++)
{
DWORD needed;
GLYPHMETRICS gm;
BYTE *buf;
TTPOLYGONHEADER *pph;
TTPOLYCURVE *ppc;
GLdouble *vertices = NULL, *vertices_temp = NULL;
int vertex_total = -1;
if(unicode)
needed = GetGlyphOutlineW(hdc, glyph, GGO_NATIVE, &gm, 0, NULL, &identity);
else
needed = GetGlyphOutlineA(hdc, glyph, GGO_NATIVE, &gm, 0, NULL, &identity);
if(needed == GDI_ERROR)
goto error;
buf = HeapAlloc(GetProcessHeap(), 0, needed);
if(!buf)
goto error;
if(unicode)
GetGlyphOutlineW(hdc, glyph, GGO_NATIVE, &gm, needed, buf, &identity);
else
GetGlyphOutlineA(hdc, glyph, GGO_NATIVE, &gm, needed, buf, &identity);
TRACE("glyph %d\n", glyph);
if(lpgmf)
{
lpgmf->gmfBlackBoxX = (float)gm.gmBlackBoxX / em_size;
lpgmf->gmfBlackBoxY = (float)gm.gmBlackBoxY / em_size;
lpgmf->gmfptGlyphOrigin.x = (float)gm.gmptGlyphOrigin.x / em_size;
lpgmf->gmfptGlyphOrigin.y = (float)gm.gmptGlyphOrigin.y / em_size;
lpgmf->gmfCellIncX = (float)gm.gmCellIncX / em_size;
lpgmf->gmfCellIncY = (float)gm.gmCellIncY / em_size;
TRACE("%fx%f at %f,%f inc %f,%f\n", lpgmf->gmfBlackBoxX, lpgmf->gmfBlackBoxY,
lpgmf->gmfptGlyphOrigin.x, lpgmf->gmfptGlyphOrigin.y, lpgmf->gmfCellIncX, lpgmf->gmfCellIncY);
lpgmf++;
}
funcs->NewList(listBase++, GL_COMPILE);
funcs->FrontFace(GL_CCW);
if(format == WGL_FONT_POLYGONS)
{
funcs->Normal3d(0.0, 0.0, 1.0);
pgluTessNormal(tess, 0, 0, 1);
pgluTessBeginPolygon(tess, NULL);
}
while(!vertices)
{
if(vertex_total != -1)
vertices_temp = vertices = HeapAlloc(GetProcessHeap(), 0, vertex_total * 3 * sizeof(GLdouble));
vertex_total = 0;
pph = (TTPOLYGONHEADER*)buf;
while((BYTE*)pph < buf + needed)
{
GLdouble previous[3];
fixed_to_double(pph->pfxStart, em_size, previous);
if(vertices)
TRACE("\tstart %d, %d\n", pph->pfxStart.x.value, pph->pfxStart.y.value);
if(format == WGL_FONT_POLYGONS)
pgluTessBeginContour(tess);
else
funcs->Begin(GL_LINE_LOOP);
if(vertices)
{
fixed_to_double(pph->pfxStart, em_size, vertices);
if(format == WGL_FONT_POLYGONS)
pgluTessVertex(tess, vertices, vertices);
else
funcs->Vertex3d(vertices[0], vertices[1], vertices[2]);
vertices += 3;
}
vertex_total++;
ppc = (TTPOLYCURVE*)((char*)pph + sizeof(*pph));
while((char*)ppc < (char*)pph + pph->cb)
{
int i, j;
int num;
switch(ppc->wType) {
case TT_PRIM_LINE:
for(i = 0; i < ppc->cpfx; i++)
{
if(vertices)
{
TRACE("\t\tline to %d, %d\n",
ppc->apfx[i].x.value, ppc->apfx[i].y.value);
fixed_to_double(ppc->apfx[i], em_size, vertices);
if(format == WGL_FONT_POLYGONS)
pgluTessVertex(tess, vertices, vertices);
else
funcs->Vertex3d(vertices[0], vertices[1], vertices[2]);
vertices += 3;
}
fixed_to_double(ppc->apfx[i], em_size, previous);
vertex_total++;
}
break;
case TT_PRIM_QSPLINE:
for(i = 0; i < ppc->cpfx-1; i++)
{
bezier_vector curve[3];
bezier_vector *points;
GLdouble curve_vertex[3];
if(vertices)
TRACE("\t\tcurve %d,%d %d,%d\n",
ppc->apfx[i].x.value, ppc->apfx[i].y.value,
ppc->apfx[i + 1].x.value, ppc->apfx[i + 1].y.value);
curve[0].x = previous[0];
curve[0].y = previous[1];
fixed_to_double(ppc->apfx[i], em_size, curve_vertex);
curve[1].x = curve_vertex[0];
curve[1].y = curve_vertex[1];
fixed_to_double(ppc->apfx[i + 1], em_size, curve_vertex);
curve[2].x = curve_vertex[0];
curve[2].y = curve_vertex[1];
if(i < ppc->cpfx-2)
{
curve[2].x = (curve[1].x + curve[2].x)/2;
curve[2].y = (curve[1].y + curve[2].y)/2;
}
num = bezier_approximate(curve, NULL, deviation);
points = HeapAlloc(GetProcessHeap(), 0, num*sizeof(bezier_vector));
num = bezier_approximate(curve, points, deviation);
vertex_total += num;
if(vertices)
{
for(j=0; j<num; j++)
{
TRACE("\t\t\tvertex at %f,%f\n", points[j].x, points[j].y);
vertices[0] = points[j].x;
vertices[1] = points[j].y;
vertices[2] = 0.0;
if(format == WGL_FONT_POLYGONS)
pgluTessVertex(tess, vertices, vertices);
else
funcs->Vertex3d(vertices[0], vertices[1], vertices[2]);
vertices += 3;
}
}
HeapFree(GetProcessHeap(), 0, points);
previous[0] = curve[2].x;
previous[1] = curve[2].y;
}
break;
default:
ERR("\t\tcurve type = %d\n", ppc->wType);
if(format == WGL_FONT_POLYGONS)
pgluTessEndContour(tess);
else
funcs->End();
goto error_in_list;
}
ppc = (TTPOLYCURVE*)((char*)ppc + sizeof(*ppc) +
(ppc->cpfx - 1) * sizeof(POINTFX));
}
if(format == WGL_FONT_POLYGONS)
pgluTessEndContour(tess);
else
funcs->End();
pph = (TTPOLYGONHEADER*)((char*)pph + pph->cb);
}
}
error_in_list:
if(format == WGL_FONT_POLYGONS)
pgluTessEndPolygon(tess);
funcs->Translated((GLdouble)gm.gmCellIncX / em_size, (GLdouble)gm.gmCellIncY / em_size, 0.0);
funcs->EndList();
HeapFree(GetProcessHeap(), 0, buf);
if(vertices_temp)
HeapFree(GetProcessHeap(), 0, vertices_temp);
}
error:
DeleteObject(SelectObject(hdc, old_font));
if(format == WGL_FONT_POLYGONS)
pgluDeleteTess(tess);
return TRUE;
}
/***********************************************************************
* wglUseFontOutlinesA (OPENGL32.@)
*/
BOOL WINAPI wglUseFontOutlinesA(HDC hdc,
DWORD first,
DWORD count,
DWORD listBase,
FLOAT deviation,
FLOAT extrusion,
int format,
LPGLYPHMETRICSFLOAT lpgmf)
{
return wglUseFontOutlines_common(hdc, first, count, listBase, deviation, extrusion, format, lpgmf, FALSE);
}
/***********************************************************************
* wglUseFontOutlinesW (OPENGL32.@)
*/
BOOL WINAPI wglUseFontOutlinesW(HDC hdc,
DWORD first,
DWORD count,
DWORD listBase,
FLOAT deviation,
FLOAT extrusion,
int format,
LPGLYPHMETRICSFLOAT lpgmf)
{
return wglUseFontOutlines_common(hdc, first, count, listBase, deviation, extrusion, format, lpgmf, TRUE);
}
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