Quelle cairo-win32-surface.c
Sprache: C
/* -*- Mode: c; tab-width: 8; c-basic-offset: 4; indent-tabs-mode: t; -*- */
/* Cairo - a vector graphics library with display and print output
*
* Copyright © 2005 Red Hat , Inc .
* Copyright © 2012 Intel Corporation
*
* This library is free software ; you can redistribute it and / or
* modify it either under the terms of the GNU Lesser General Public
* License version 2 . 1 as published by the Free Software Foundation
* ( the " LGPL " ) or , at your option , under the terms of the Mozilla
* Public License Version 1 . 1 ( the " MPL " ) . If you do not alter this
* notice , a recipient may use your version of this file under either
* the MPL or the LGPL .
*
* You should have received a copy of the LGPL along with this library
* in the file COPYING - LGPL - 2 . 1 ; if not , write to the Free Software
* Foundation , Inc . , 51 Franklin Street , Suite 500 , Boston , MA 02110 - 1335 , USA
* You should have received a copy of the MPL along with this library
* in the file COPYING - MPL - 1 . 1
*
* The contents of this file are subject to the Mozilla Public License
* Version 1 . 1 ( the " License " ) ; you may not use this file except in
* compliance with the License . You may obtain a copy of the License at
* http : //www.mozilla.org/MPL/
*
* This software is distributed on an " AS IS " basis , WITHOUT WARRANTY
* OF ANY KIND , either express or implied . See the LGPL or the MPL for
* the specific language governing rights and limitations .
*
* The Original Code is the cairo graphics library .
*
* The Initial Developer of the Original Code is Red Hat , Inc .
*
* Contributor ( s ) :
* Owen Taylor < otaylor @ redhat . com >
* Stuart Parmenter < stuart @ mozilla . com >
* Vladimir Vukicevic < vladimir @ pobox . com >
*/
#include "cairoint.h"
#include "cairo-backend-private.h"
#include "cairo-default-context-private.h"
#include "cairo-error-private.h"
#include "cairo-image-surface-private.h"
#include "cairo-paginated-private.h"
#include "cairo-pattern-private.h"
#include "cairo-win32-private.h"
#include "cairo-scaled-font-subsets-private.h"
#include "cairo-surface-fallback-private.h"
#include "cairo-surface-backend-private.h"
#include <wchar.h>
#include <windows.h>
/**
* SECTION : cairo - win32
* @ Title : Win32 Surfaces
* @ Short_Description : Microsoft Windows surface support
* @ See_Also : # cairo_surface_t
*
* The Microsoft Windows surface is used to render cairo graphics to
* Microsoft Windows windows , bitmaps , and printing device contexts .
*
* The surface returned by cairo_win32_printing_surface_create ( ) is of surface
* type % CAIRO_SURFACE_TYPE_WIN32_PRINTING and is a multi - page vector surface
* type .
*
* The surface returned by the other win32 constructors is of surface type
* % CAIRO_SURFACE_TYPE_WIN32 and is a raster surface type .
**/
/**
* CAIRO_HAS_WIN32_SURFACE :
*
* Defined if the Microsoft Windows surface backend is available .
* This macro can be used to conditionally compile backend - specific code .
*
* Since : 1 . 0
**/
cairo_bool_t
_cairo_win32_surface_get_extents (void *abstract_surface,
cairo_rectangle_int_t *rectangle)
{
cairo_win32_surface_t *surface = abstract_surface;
*rectangle = surface->extents;
return TRUE;
}
/**
* cairo_win32_surface_get_dc :
* @ surface : a # cairo_surface_t
*
* Returns the HDC associated with this surface , or % NULL if none .
* Also returns % NULL if the surface is not a win32 surface .
*
* A call to cairo_surface_flush ( ) is required before using the HDC to
* ensure that all pending drawing operations are finished and to
* restore any temporary modification cairo has made to its state . A
* call to cairo_surface_mark_dirty ( ) is required after the state or
* the content of the HDC has been modified .
*
* Return value : HDC or % NULL if no HDC available .
*
* Since : 1 . 2
**/
HDC
cairo_win32_surface_get_dc (cairo_surface_t *surface)
{
if (surface->backend == NULL)
return NULL;
if (surface->backend->type == CAIRO_SURFACE_TYPE_WIN32)
return to_win32_surface(surface)->dc;
if (_cairo_surface_is_paginated (surface)) {
cairo_surface_t *target = _cairo_paginated_surface_get_target (surface);
if (target->backend->type == CAIRO_SURFACE_TYPE_WIN32_PRINTING)
return to_win32_surface(target)->dc;
}
return NULL;
}
/**
* cairo_win32_get_dc_with_clip :
* ( Mozilla addition )
*/
HDC
cairo_win32_get_dc_with_clip(cairo_t* cr)
{
cairo_surface_t* surface = cairo_get_target(cr);
if (cr->backend->type == CAIRO_TYPE_DEFAULT) {
cairo_default_context_t* c = (cairo_default_context_t*)cr;
cairo_clip_t* clip = _cairo_clip_copy(_cairo_gstate_get_clip(c->gstate));
if (_cairo_surface_is_win32(surface)) {
cairo_win32_display_surface_t* winsurf = (cairo_win32_display_surface_t*)surface;
_cairo_win32_display_surface_set_clip(winsurf, clip);
_cairo_clip_destroy(clip);
return winsurf->win32.dc;
}
if (_cairo_surface_is_paginated(surface)) {
cairo_surface_t* target;
target = _cairo_paginated_surface_get_target(surface);
#ifndef CAIRO_OMIT_WIN32_PRINTING
if (_cairo_surface_is_win32_printing(target)) {
cairo_status_t status;
cairo_win32_printing_surface_t* psurf = (cairo_win32_printing_surface_t*)target;
status = _cairo_surface_clipper_set_clip(&psurf->clipper, clip);
_cairo_clip_destroy(clip);
if (status)
return NULL;
return psurf->win32.dc;
}
#endif
}
_cairo_clip_destroy(clip);
}
return NULL;
}
/**
* _ cairo_surface_is_win32 :
* @ surface : a # cairo_surface_t
*
* Checks if a surface is an # cairo_win32_surface_t
*
* Return value : % TRUE if the surface is an win32 surface
**/
cairo_bool_t
_cairo_surface_is_win32 (const cairo_surface_t *surface)
{
/* _cairo_surface_nil sets a NULL backend so be safe */
return surface->backend && surface->backend->type == CAIRO_SURFACE_TYPE_WIN32;
}
/**
* cairo_win32_surface_get_image :
* @ surface : a # cairo_surface_t
*
* Returns a # cairo_surface_t image surface that refers to the same bits
* as the DIB of the Win32 surface . If the passed - in win32 surface
* is not a DIB surface , % NULL is returned .
*
* Return value : a # cairo_surface_t ( owned by the win32 # cairo_surface_t ) ,
* or % NULL if the win32 surface is not a DIB .
*
* Since : 1 . 4
**/
cairo_surface_t *
cairo_win32_surface_get_image (cairo_surface_t *surface)
{
if (! _cairo_surface_is_win32 (surface)) {
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH));
}
GdiFlush();
return to_win32_display_surface(surface)->image;
}
#define STACK_GLYPH_SIZE 256
cairo_int_status_t
_cairo_win32_surface_emit_glyphs (cairo_win32_surface_t *dst,
const cairo_pattern_t *source,
cairo_glyph_t *glyphs,
int num_glyphs,
cairo_scaled_font_t *scaled_font,
cairo_bool_t glyph_indexing)
{
#if CAIRO_HAS_DWRITE_FONT
if (scaled_font->backend->type == CAIRO_FONT_TYPE_DWRITE) {
if (!glyph_indexing) return CAIRO_INT_STATUS_UNSUPPORTED;
// FIXME: fake values for params that aren't currently passed in here
cairo_operator_t op = CAIRO_OPERATOR_SOURCE;
cairo_clip_t *clip = NULL;
return _cairo_dwrite_show_glyphs_on_surface (dst, op, source, glyphs, num_glyphs, scaled_font, clip /* , glyph_indexing */ );
}
#endif
#if CAIRO_HAS_WIN32_FONT
WORD glyph_buf_stack[STACK_GLYPH_SIZE];
WORD *glyph_buf = glyph_buf_stack;
int dxy_buf_stack[2 * STACK_GLYPH_SIZE];
int *dxy_buf = dxy_buf_stack;
BOOL win_result = 0 ;
int i, j;
cairo_solid_pattern_t *solid_pattern;
COLORREF color;
cairo_matrix_t device_to_logical;
int start_x, start_y;
double user_x, user_y;
int logical_x, logical_y;
unsigned int glyph_index_option;
/* We can only handle win32 fonts */
assert (cairo_scaled_font_get_type (scaled_font) == CAIRO_FONT_TYPE_WIN32);
/* We can only handle opaque solid color sources and destinations */
assert (_cairo_pattern_is_opaque_solid(source));
assert (dst->format == CAIRO_FORMAT_RGB24);
solid_pattern = (cairo_solid_pattern_t *)source;
color = RGB(((int )solid_pattern->color.red_short) >> 8 ,
((int )solid_pattern->color.green_short) >> 8 ,
((int )solid_pattern->color.blue_short) >> 8 );
cairo_win32_scaled_font_get_device_to_logical(scaled_font, &device_to_logical);
SaveDC(dst->dc);
cairo_win32_scaled_font_select_font(scaled_font, dst->dc);
SetTextColor(dst->dc, color);
SetTextAlign(dst->dc, TA_BASELINE | TA_LEFT);
SetBkMode(dst->dc, TRANSPARENT);
if (num_glyphs > STACK_GLYPH_SIZE) {
glyph_buf = (WORD *) _cairo_malloc_ab (num_glyphs, sizeof (WORD));
dxy_buf = (int *) _cairo_malloc_abc (num_glyphs, sizeof (int ), 2 );
}
/* It is vital that dx values for dxy_buf are calculated from the delta of
* _ logical_ x coordinates ( not user x coordinates ) or else the sum of all
* previous dx values may start to diverge from the current glyph ' s x
* coordinate due to accumulated rounding error . As a result strings could
* be painted shorter or longer than expected. */
user_x = glyphs[0 ].x;
user_y = glyphs[0 ].y;
cairo_matrix_transform_point(&device_to_logical,
&user_x, &user_y);
logical_x = _cairo_lround (user_x);
logical_y = _cairo_lround (user_y);
start_x = logical_x;
start_y = logical_y;
for (i = 0 , j = 0 ; i < num_glyphs; ++i, j = 2 * i) {
glyph_buf[i] = (WORD) glyphs[i].index;
if (i == num_glyphs - 1 ) {
dxy_buf[j] = 0 ;
dxy_buf[j+1 ] = 0 ;
} else {
double next_user_x = glyphs[i+1 ].x;
double next_user_y = glyphs[i+1 ].y;
int next_logical_x, next_logical_y;
cairo_matrix_transform_point(&device_to_logical,
&next_user_x, &next_user_y);
next_logical_x = _cairo_lround (next_user_x);
next_logical_y = _cairo_lround (next_user_y);
dxy_buf[j] = _cairo_lround (next_logical_x - logical_x);
/* Note that GDI coordinate system is inverted! */
dxy_buf[j+1 ] = _cairo_lround (logical_y - next_logical_y);
logical_x = next_logical_x;
logical_y = next_logical_y;
}
}
if (glyph_indexing)
glyph_index_option = ETO_GLYPH_INDEX;
else
glyph_index_option = 0 ;
win_result = ExtTextOutW(dst->dc,
start_x,
start_y,
glyph_index_option | ETO_PDY,
NULL,
glyph_buf,
num_glyphs,
dxy_buf);
if (!win_result) {
fprintf (stderr, "%s:%s\n" , __FUNCTION__, "ExtTextOut" );
}
RestoreDC(dst->dc, -1 );
if (glyph_buf != glyph_buf_stack) {
free(glyph_buf);
free(dxy_buf);
}
return (win_result) ? CAIRO_STATUS_SUCCESS : CAIRO_INT_STATUS_UNSUPPORTED;
#else
return CAIRO_INT_STATUS_UNSUPPORTED;
#endif
}
#undef STACK_GLYPH_SIZE
cairo_status_t
cairo_win32_surface_get_size(const cairo_surface_t* surface, int * width, int * height)
{
if (!_cairo_surface_is_win32(surface))
return CAIRO_STATUS_SURFACE_TYPE_MISMATCH;
const cairo_win32_surface_t* winsurface = (const cairo_win32_surface_t*)surface;
*width = winsurface->extents.width;
*height = winsurface->extents.height;
return CAIRO_STATUS_SUCCESS;
}
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(vorverarbeitet am 2026-08-26)
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2026-08-25
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