blob: c97641685fc0a3f7ffb6ae32d35ba4363a7f6610 [file] [log] [blame]
/* vim:set ts=8 sw=4 noet cin: */
/* cairo - a vector graphics library with display and print output
*
* Copyright © 2005 Christian Biesinger <cbiesinger@web.de>
*
* 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 Christian Biesinger
* <cbiesinger@web.de>
*
* Contributor(s):
*/
// This is a C++ file in order to use the C++ BeOS API
#include "cairoint.h"
#include "cairo-beos.h"
#include "cairo-error-private.h"
#include "cairo-image-surface-inline.h"
#include <new>
#include <Bitmap.h>
#include <Region.h>
#if 0
#include <DirectWindow.h>
#endif
#include <Screen.h>
#include <Window.h>
#include <Locker.h>
/**
* SECTION:beos-surface
* @Title: BeOS Surfaces
* @Short_Description: BeOS surface support
* @See_Also: #cairo_surface_t
*
* The BeOS surface is used to render cairo graphics to BeOS views
* and bitmaps.
**/
#define CAIRO_INT_STATUS_SUCCESS (cairo_int_status_t)(CAIRO_STATUS_SUCCESS)
struct cairo_beos_surface_t {
cairo_surface_t base;
cairo_region_t *clip_region;
BView* view;
/*
* A view is either attached to a bitmap, a window, or unattached.
* If it is attached to a window, we can copy data out of it using BScreen.
* If it is attached to a bitmap, we can read the bitmap data.
* If it is not attached, it doesn't draw anything, we need not bother.
*
* Since there doesn't seem to be a way to get the bitmap from a view if it
* is attached to one, we have to use a special surface creation function.
*/
BBitmap* bitmap;
// If true, surface and view should be deleted when this surface is
// destroyed
bool owns_bitmap_view;
};
class AutoLockView {
public:
AutoLockView(BView* view) : mView(view) {
mOK = mView->LockLooper();
}
~AutoLockView() {
if (mOK)
mView->UnlockLooper();
}
operator bool() {
return mOK;
}
private:
BView* mView;
bool mOK;
};
static cairo_surface_t *
_cairo_beos_surface_create_internal (BView* view,
BBitmap* bmp,
bool owns_bitmap_view = false);
static inline BRect
_cairo_rectangle_to_brect (const cairo_rectangle_int_t* rect)
{
// A BRect is one pixel wider than you'd think
return BRect (rect->x, rect->y,
rect->x + rect->width - 1,
rect->y + rect->height - 1);
}
static inline cairo_rectangle_int_t
_brect_to_cairo_rectangle (const BRect &rect)
{
cairo_rectangle_int_t retval;
retval.x = floor (rect.left);
retval.y = floor (rect.top);
retval.width = ceil (rect.right) - retval.x + 1;
retval.height = ceil (rect.bottom) - rectval.y + 1;
return retval;
}
static inline rgb_color
_cairo_color_to_be_color (const cairo_color_t *color)
{
// This factor ensures a uniform distribution of numbers
const float factor = 256 - 1e-5;
// Using doubles to have non-premultiplied colors
rgb_color be_color = { uint8(color->red * factor),
uint8(color->green * factor),
uint8(color->blue * factor),
uint8(color->alpha * factor) };
return be_color;
}
enum ViewCopyStatus {
OK,
NOT_VISIBLE, // The view or the interest rect is not visible on screen
ERROR // The view was visible, but the rect could not be copied. Probably OOM
};
/**
* _cairo_beos_view_to_bitmap:
* @bitmap: [out] The resulting bitmap.
* @rect: [out] The rectangle that was copied, in the view's coordinate system
* @interestRect: If non-null, only this part of the view will be copied (view's coord system).
*
* Gets the contents of the view as a BBitmap*. Caller must delete the bitmap.
**/
static ViewCopyStatus
_cairo_beos_view_to_bitmap (BView* view,
BBitmap** bitmap,
BRect* rect = NULL,
const BRect* interestRect = NULL)
{
*bitmap = NULL;
BWindow* wnd = view->Window();
// If we have no window, can't do anything
if (!wnd)
return NOT_VISIBLE;
view->Sync();
wnd->Sync();
#if 0
// Is it a direct window?
BDirectWindow* directWnd = dynamic_cast<BDirectWindow*>(wnd);
if (directWnd) {
// WRITEME
}
#endif
// Is it visible? If so, we can copy the content off the screen
if (wnd->IsHidden())
return NOT_VISIBLE;
BRect rectToCopy(view->Bounds());
if (interestRect)
rectToCopy = rectToCopy & *interestRect;
if (!rectToCopy.IsValid())
return NOT_VISIBLE;
BScreen screen(wnd);
BRect screenRect(view->ConvertToScreen(rectToCopy));
screenRect = screenRect & screen.Frame();
if (!screen.IsValid())
return NOT_VISIBLE;
if (rect)
*rect = view->ConvertFromScreen(screenRect);
if (screen.GetBitmap(bitmap, false, &screenRect) == B_OK)
return OK;
return ERROR;
}
static void
unpremultiply_bgra (unsigned char* data,
int width,
int height,
int stride,
unsigned char* retdata)
{
unsigned char* end = data + stride * height;
for (unsigned char* in = data, *out = retdata;
in < end;
in += stride, out += stride)
{
for (int i = 0; i < width; i ++) {
uint8_t *b = &out[4*i];
uint32_t pixel;
uint8_t alpha;
memcpy (&pixel, &data[4*i], sizeof (uint32_t));
alpha = pixel & 0xff;
if (alpha == 0) {
b[0] = b[1] = b[2] = b[3] = 0;
} else {
b[0] = (((pixel >> 24) & 0xff) * 255 + alpha / 2) / alpha;
b[1] = (((pixel >> 16) & 0xff) * 255 + alpha / 2) / alpha;
b[2] = (((pixel >> 8) & 0xff) * 255 + alpha / 2) / alpha;
b[3] = alpha;
}
}
}
}
static inline int
multiply_alpha (int alpha, int color)
{
int temp = (alpha * color) + 0x80;
return ((temp + (temp >> 8)) >> 8);
}
static unsigned char*
premultiply_bgra (unsigned char* data,
int width,
int height,
int stride)
{
uint8_t * retdata = reinterpret_cast<unsigned char*>(_cairo_malloc_ab(height, stride));
if (!retdata)
return NULL;
uint8_t * end = data + stride * height;
for (uint8_t * in = data, *out = retdata;
in < end;
in += stride, out += stride)
{
for (int i = 0; i < width; i ++) {
uint8_t *base = &in[4*i];
uint8_t alpha = base[3];
uint32_t p;
if (alpha == 0) {
p = 0;
} else {
uint8_t blue = base[0];
uint8_t green = base[1];
uint8_t red = base[2];
if (alpha != 0xff) {
blue = multiply_alpha (alpha, blue);
green = multiply_alpha (alpha, green);
red = multiply_alpha (alpha, red);
}
p = (alpha << 0) | (red << 8) | (green << 16) | (blue << 24);
}
memcpy (&out[4*i], &p, sizeof (uint32_t));
}
}
return retdata;
}
static cairo_int_status_t
_cairo_beos_surface_set_clip_region (cairo_beos_surface_t *surface,
cairo_region_t *region)
{
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
abstract_surface);
AutoLockView locker(surface->view);
assert (locker);
if (region == surface->clip_region)
return CAIRO_INT_STATUS_SUCCESS;
cairo_region_destroy (surface->clip_region);
surface->clip_region = cairo_region_reference (region);
if (region == NULL) {
// No clipping
surface->view->ConstrainClippingRegion(NULL);
return CAIRO_INT_STATUS_SUCCESS;
}
int count = cairo_region_num_rectangles (region);
BRegion bregion;
for (int i = 0; i < count; ++i) {
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (region, i, &rect);
// Have to subtract one, because for pixman, the second coordinate
// lies outside the rectangle.
bregion.Include (_cairo_rectangle_to_brect (&rect));
}
surface->view->ConstrainClippingRegion(&bregion);
return CAIRO_INT_STATUS_SUCCESS;
}
/**
* _cairo_beos_bitmap_to_surface:
*
* Returns an addrefed image surface for a BBitmap. The bitmap need not outlive
* the surface.
**/
static cairo_image_surface_t*
_cairo_beos_bitmap_to_surface (BBitmap* bitmap)
{
color_space format = bitmap->ColorSpace();
if (format != B_RGB32 && format != B_RGBA32) {
BBitmap bmp(bitmap->Bounds(), B_RGB32, true);
BView view(bitmap->Bounds(), "Cairo bitmap drawing view",
B_FOLLOW_ALL_SIDES, 0);
bmp.AddChild(&view);
view.LockLooper();
view.DrawBitmap(bitmap, BPoint(0.0, 0.0));
view.Sync();
cairo_image_surface_t* imgsurf = _cairo_beos_bitmap_to_surface(&bmp);
view.UnlockLooper();
bmp.RemoveChild(&view);
return imgsurf;
}
cairo_format_t cformat = format == B_RGB32 ?
CAIRO_FORMAT_RGB24 : CAIRO_FORMAT_ARGB32;
BRect bounds(bitmap->Bounds());
unsigned char* bits = reinterpret_cast<unsigned char*>(bitmap->Bits());
int width = bounds.IntegerWidth() + 1;
int height = bounds.IntegerHeight() + 1;
unsigned char* premultiplied;
if (cformat == CAIRO_FORMAT_ARGB32) {
premultiplied = premultiply_bgra (bits, width, height,
bitmap->BytesPerRow());
} else {
premultiplied = reinterpret_cast<unsigned char*>(
_cairo_malloc_ab(bitmap->BytesPerRow(), height));
if (premultiplied)
memcpy(premultiplied, bits, bitmap->BytesPerRow() * height);
}
if (!premultiplied)
return _cairo_surface_create_in_error (_cairo_error (CAIRO_STATUS_NO_MEMORY));
cairo_image_surface_t* surf = reinterpret_cast<cairo_image_surface_t*>
(cairo_image_surface_create_for_data(premultiplied,
cformat,
width,
height,
bitmap->BytesPerRow()));
if (surf->base.status)
free(premultiplied);
else
_cairo_image_surface_assume_ownership_of_data(surf);
return surf;
}
/**
* _cairo_image_surface_to_bitmap:
*
* Converts an image surface to a BBitmap. The return value must be freed with
* delete.
**/
static BBitmap*
_cairo_image_surface_to_bitmap (cairo_image_surface_t* surface)
{
BRect size(0.0, 0.0, surface->width - 1, surface->height - 1);
switch (surface->format) {
case CAIRO_FORMAT_ARGB32: {
BBitmap* data = new BBitmap(size, B_RGBA32);
unpremultiply_bgra (surface->data,
surface->width,
surface->height,
surface->stride,
reinterpret_cast<unsigned char*>(data->Bits()));
return data;
}
case CAIRO_FORMAT_RGB24: {
BBitmap* data = new BBitmap(size, B_RGB32);
memcpy(data->Bits(), surface->data, surface->height * surface->stride);
return data;
}
default:
assert(0);
return NULL;
}
}
/**
* _cairo_op_to_be_op:
*
* Converts a cairo drawing operator to a beos drawing_mode. Returns true if
* the operator could be converted, false otherwise.
**/
static bool
_cairo_op_to_be_op (cairo_operator_t cairo_op,
drawing_mode* beos_op)
{
switch (cairo_op) {
case CAIRO_OPERATOR_SOURCE:
*beos_op = B_OP_COPY;
return true;
case CAIRO_OPERATOR_OVER:
*beos_op = B_OP_ALPHA;
return true;
case CAIRO_OPERATOR_ADD:
// Does not actually work
// XXX This is a fundamental compositing operator, it has to work!
#if 1
return false;
#else
*beos_op = B_OP_ADD;
return true;
#endif
case CAIRO_OPERATOR_CLEAR:
// Does not map to B_OP_ERASE - it replaces the dest with the low
// color, instead of transparency; could be done by setting low
// color appropriately.
case CAIRO_OPERATOR_IN:
case CAIRO_OPERATOR_OUT:
case CAIRO_OPERATOR_ATOP:
case CAIRO_OPERATOR_DEST:
case CAIRO_OPERATOR_DEST_OVER:
case CAIRO_OPERATOR_DEST_IN:
case CAIRO_OPERATOR_DEST_OUT:
case CAIRO_OPERATOR_DEST_ATOP:
case CAIRO_OPERATOR_XOR:
case CAIRO_OPERATOR_SATURATE:
default:
return false;
}
}
static cairo_surface_t *
_cairo_beos_surface_create_similar (void *abstract_surface,
cairo_content_t content,
int width,
int height)
{
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
abstract_surface);
if (width <= 0)
width = 1;
if (height <= 0)
height = 1;
BRect rect(0.0, 0.0, width - 1, height - 1);
BBitmap* bmp;
switch (content) {
case CAIRO_CONTENT_ALPHA:
return NULL;
case CAIRO_CONTENT_COLOR_ALPHA:
bmp = new BBitmap(rect, B_RGBA32, true);
break;
case CAIRO_CONTENT_COLOR:
// Match the color depth
if (surface->bitmap) {
color_space space = surface->bitmap->ColorSpace();
// No alpha was requested -> make sure not to return
// a surface with alpha
if (space == B_RGBA32)
space = B_RGB32;
if (space == B_RGBA15)
space = B_RGB15;
bmp = new BBitmap(rect, space, true);
} else {
BScreen scr(surface->view->Window());
color_space space = B_RGB32;
if (scr.IsValid())
space = scr.ColorSpace();
bmp = new BBitmap(rect, space, true);
}
break;
default:
ASSERT_NOT_REACHED;
return NULL;
}
BView* view = new BView(rect, "Cairo bitmap view", B_FOLLOW_ALL_SIDES, 0);
bmp->AddChild(view);
return _cairo_beos_surface_create_internal(view, bmp, true);
}
static cairo_status_t
_cairo_beos_surface_finish (void *abstract_surface)
{
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
abstract_surface);
if (surface->owns_bitmap_view) {
if (surface->bitmap)
surface->bitmap->RemoveChild(surface->view);
delete surface->view;
delete surface->bitmap;
surface->view = NULL;
surface->bitmap = NULL;
}
cairo_region_destroy (surface->clip_region);
return CAIRO_STATUS_SUCCESS;
}
static cairo_status_t
_cairo_beos_surface_acquire_source_image (void *abstract_surface,
cairo_image_surface_t **image_out,
void **image_extra)
{
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
abstract_surface);
AutoLockView locker(surface->view);
if (!locker)
return CAIRO_STATUS_NO_MEMORY; /// XXX not exactly right, but what can we do?
surface->view->Sync();
if (surface->bitmap) {
*image_out = _cairo_beos_bitmap_to_surface (surface->bitmap);
if (unlikely ((*image_out)->base.status))
return (*image_out)->base.status;
*image_extra = NULL;
return CAIRO_STATUS_SUCCESS;
}
BBitmap* bmp;
if (_cairo_beos_view_to_bitmap(surface->view, &bmp) != OK)
return CAIRO_STATUS_NO_MEMORY; /// XXX incorrect if the error was NOT_VISIBLE
*image_out = _cairo_beos_bitmap_to_surface (bmp);
if (unlikely ((*image_out)->base.status)) {
delete bmp;
return (*image_out)->base.status;
}
*image_extra = bmp;
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_beos_surface_release_source_image (void *abstract_surface,
cairo_image_surface_t *image,
void *image_extra)
{
cairo_surface_destroy (&image->base);
if (image_extra != NULL) {
BBitmap* bmp = static_cast<BBitmap*>(image_extra);
delete bmp;
}
}
static cairo_status_t
_cairo_beos_surface_acquire_dest_image (void *abstract_surface,
cairo_rectangle_int_t *interest_rect,
cairo_image_surface_t **image_out,
cairo_rectangle_int_t *image_rect,
void **image_extra)
{
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
abstract_surface);
AutoLockView locker(surface->view);
if (!locker) {
*image_out = NULL;
*image_extra = NULL;
return (cairo_status_t) CAIRO_INT_STATUS_NOTHING_TO_DO;
}
if (surface->bitmap) {
surface->view->Sync();
*image_out = _cairo_beos_bitmap_to_surface(surface->bitmap);
if (unlikely ((*image_out)->base.status))
return (*image_out)->base.status;
image_rect->x = 0;
image_rect->y = 0;
image_rect->width = (*image_out)->width;
image_rect->height = (*image_out)->height;
*image_extra = NULL;
return CAIRO_STATUS_SUCCESS;
}
BRect b_interest_rect (_cairo_rectangle_to_brect (interest_rect));
BRect rect;
BBitmap* bitmap;
ViewCopyStatus status = _cairo_beos_view_to_bitmap(surface->view, &bitmap,
&rect, &b_interest_rect);
if (status == NOT_VISIBLE) {
*image_out = NULL;
*image_extra = NULL;
return CAIRO_STATUS_SUCCESS;
}
if (status == ERROR)
return CAIRO_STATUS_NO_MEMORY;
*image_rect = _brect_to_cairo_rectangle(rect);
*image_out = _cairo_beos_bitmap_to_surface(bitmap);
delete bitmap;
if (unlikely ((*image_out)->base.status))
return (*image_out)->base.status;
*image_extra = NULL;
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_beos_surface_release_dest_image (void *abstract_surface,
cairo_rectangle_int_t *intersect_rect,
cairo_image_surface_t *image,
cairo_rectangle_int_t *image_rect,
void *image_extra)
{
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
abstract_surface);
AutoLockView locker(surface->view);
if (!locker)
return;
BBitmap* bitmap_to_draw = _cairo_image_surface_to_bitmap(image);
surface->view->PushState();
surface->view->SetDrawingMode(B_OP_COPY);
surface->view->DrawBitmap (bitmap_to_draw,
_cairo_rectangle_to_brect (image_rect));
surface->view->PopState();
delete bitmap_to_draw;
cairo_surface_destroy(&image->base);
}
static cairo_int_status_t
_cairo_beos_surface_composite (cairo_operator_t op,
cairo_pattern_t *src,
cairo_pattern_t *mask,
void *dst,
int src_x,
int src_y,
int mask_x,
int mask_y,
int dst_x,
int dst_y,
unsigned int width,
unsigned int height,
cairo_region_t *clip_region)
{
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
dst);
cairo_int_status_t status;
AutoLockView locker(surface->view);
if (!locker)
return CAIRO_INT_STATUS_SUCCESS;
drawing_mode mode;
if (!_cairo_op_to_be_op(op, &mode))
return CAIRO_INT_STATUS_UNSUPPORTED;
// XXX Masks are not yet supported
if (mask)
return CAIRO_INT_STATUS_UNSUPPORTED;
// XXX should eventually support the others
if (src->type != CAIRO_PATTERN_TYPE_SURFACE ||
src->extend != CAIRO_EXTEND_NONE)
{
return CAIRO_INT_STATUS_UNSUPPORTED;
}
// Can we maybe support other matrices as well? (scale? if the filter is right)
int itx, ity;
if (!_cairo_matrix_is_integer_translation(&src->matrix, &itx, &ity))
return CAIRO_INT_STATUS_UNSUPPORTED;
status = _cairo_beos_surface_set_clip_region (surface, clip_region);
if (unlikely (status))
return status;
BRect srcRect(src_x + itx,
src_y + ity,
src_x + itx + width - 1,
src_y + ity + height - 1);
BRect dstRect(dst_x, dst_y, dst_x + width - 1, dst_y + height - 1);
cairo_surface_t* src_surface = reinterpret_cast<cairo_surface_pattern_t*>(src)->
surface;
// Get a bitmap
BBitmap* bmp = NULL;
bool free_bmp = false;
if (_cairo_surface_is_image(src_surface)) {
cairo_image_surface_t* img_surface =
reinterpret_cast<cairo_image_surface_t*>(src_surface);
bmp = _cairo_image_surface_to_bitmap(img_surface);
free_bmp = true;
} else if (src_surface->backend == surface->base.backend) {
cairo_beos_surface_t *beos_surface =
reinterpret_cast<cairo_beos_surface_t*>(src_surface);
if (beos_surface->bitmap) {
AutoLockView locker(beos_surface->view);
if (locker)
beos_surface->view->Sync();
bmp = beos_surface->bitmap;
} else {
_cairo_beos_view_to_bitmap(surface->view, &bmp);
free_bmp = true;
}
}
if (!bmp)
return CAIRO_INT_STATUS_UNSUPPORTED;
// So, BeOS seems to screw up painting an opaque bitmap onto a
// translucent one (it makes them partly transparent). Just return
// unsupported.
if (bmp->ColorSpace() == B_RGB32 && surface->bitmap &&
surface->bitmap->ColorSpace() == B_RGBA32 &&
(mode == B_OP_COPY || mode == B_OP_ALPHA))
{
if (free_bmp)
delete bmp;
return CAIRO_INT_STATUS_UNSUPPORTED;
}
// Draw it on screen.
surface->view->PushState();
// If our image rect is only a subrect of the desired size, and we
// aren't using B_OP_ALPHA, then we need to fill the rect first.
if (mode == B_OP_COPY && !bmp->Bounds().Contains(srcRect)) {
rgb_color black = { 0, 0, 0, 0 };
surface->view->SetDrawingMode(mode);
surface->view->SetHighColor(black);
surface->view->FillRect(dstRect);
}
if (mode == B_OP_ALPHA && bmp->ColorSpace() == B_RGB32) {
mode = B_OP_COPY;
}
surface->view->SetDrawingMode(mode);
if (surface->bitmap && surface->bitmap->ColorSpace() == B_RGBA32)
surface->view->SetBlendingMode(B_PIXEL_ALPHA, B_ALPHA_COMPOSITE);
else
surface->view->SetBlendingMode(B_PIXEL_ALPHA, B_ALPHA_OVERLAY);
surface->view->DrawBitmap(bmp, srcRect, dstRect);
surface->view->PopState();
if (free_bmp)
delete bmp;
return CAIRO_INT_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_beos_surface_fill_rectangles (void *abstract_surface,
cairo_operator_t op,
const cairo_color_t *color,
cairo_rectangle_int_t *rects,
int num_rects,
cairo_region_t *clip_region)
{
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
abstract_surface);
cairo_int_status_t status;
if (num_rects <= 0)
return CAIRO_INT_STATUS_SUCCESS;
AutoLockView locker(surface->view);
if (!locker)
return CAIRO_INT_STATUS_SUCCESS;
drawing_mode mode;
if (!_cairo_op_to_be_op(op, &mode))
return CAIRO_INT_STATUS_UNSUPPORTED;
status = _cairo_beos_surface_set_clip_region (surface, clip_region);
if (unlikely (status))
return status;
rgb_color be_color = _cairo_color_to_be_color(color);
if (mode == B_OP_ALPHA && be_color.alpha == 0xFF)
mode = B_OP_COPY;
// For CAIRO_OPERATOR_SOURCE, cairo expects us to use the premultiplied
// color info. This is only relevant when drawing into an rgb24 buffer
// (as for others, we can convert when asked for the image)
if (mode == B_OP_COPY && be_color.alpha != 0xFF &&
(!surface->bitmap || surface->bitmap->ColorSpace() != B_RGBA32))
{
be_color.red = color->red_short >> 8;
be_color.green = color->green_short >> 8;
be_color.blue = color->blue_short >> 8;
}
surface->view->PushState();
surface->view->SetDrawingMode(mode);
surface->view->SetHighColor(be_color);
if (surface->bitmap && surface->bitmap->ColorSpace() == B_RGBA32)
surface->view->SetBlendingMode(B_CONSTANT_ALPHA, B_ALPHA_COMPOSITE);
else
surface->view->SetBlendingMode(B_CONSTANT_ALPHA, B_ALPHA_OVERLAY);
for (int i = 0; i < num_rects; ++i)
surface->view->FillRect (_cairo_rectangle_to_brect (&rects[i]));
surface->view->PopState();
return CAIRO_INT_STATUS_SUCCESS;
}
static cairo_bool_t
_cairo_beos_surface_get_extents (void *abstract_surface,
cairo_rectangle_int_t *rectangle)
{
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
abstract_surface);
AutoLockView locker(surface->view);
if (!locker)
return FALSE;
*rectangle = _brect_to_cairo_rectangle (surface->view->Bounds());
return TRUE;
}
static const struct _cairo_surface_backend cairo_beos_surface_backend = {
CAIRO_SURFACE_TYPE_BEOS,
_cairo_beos_surface_create_similar,
_cairo_beos_surface_finish,
_cairo_beos_surface_acquire_source_image,
_cairo_beos_surface_release_source_image,
_cairo_beos_surface_acquire_dest_image,
_cairo_beos_surface_release_dest_image,
NULL, /* clone_similar */
_cairo_beos_surface_composite, /* composite */
_cairo_beos_surface_fill_rectangles,
NULL, /* composite_trapezoids */
NULL, /* create_span_renderer */
NULL, /* check_span_renderer */
NULL, /* copy_page */
NULL, /* show_page */
_cairo_beos_surface_get_extents,
NULL, /* old_show_glyphs */
NULL, /* get_font_options */
NULL, /* flush */
NULL, /* mark_dirty_rectangle */
NULL, /* scaled_font_fini */
NULL, /* scaled_glyph_fini */
NULL, /* paint */
NULL, /* mask */
NULL, /* stroke */
NULL, /* fill */
NULL /* show_glyphs */
};
static cairo_surface_t *
_cairo_beos_surface_create_internal (BView* view,
BBitmap* bmp,
bool owns_bitmap_view)
{
// Must use malloc, because cairo code will use free() on the surface
cairo_beos_surface_t *surface = static_cast<cairo_beos_surface_t*>(
malloc(sizeof(cairo_beos_surface_t)));
if (surface == NULL) {
_cairo_error (CAIRO_STATUS_NO_MEMORY);
return const_cast<cairo_surface_t*>(&_cairo_surface_nil);
}
cairo_content_t content = CAIRO_CONTENT_COLOR;
if (bmp && (bmp->ColorSpace() == B_RGBA32 || bmp->ColorSpace() == B_RGBA15))
content = CAIRO_CONTENT_COLOR_ALPHA;
_cairo_surface_init (&surface->base,
&cairo_beos_surface_backend,
NULL, /* device */
content);
surface->view = view;
surface->bitmap = bmp;
surface->owns_bitmap_view = owns_bitmap_view;
surface->clip_region = NULL;
return &surface->base;
}
/**
* cairo_beos_surface_create:
* @view: The view to draw on
*
* Creates a Cairo surface that draws onto a BeOS BView.
* The caller must ensure that the view does not get deleted before the surface.
* If the view is attached to a bitmap rather than an on-screen window, use
* cairo_beos_surface_create_for_bitmap() instead of this function.
*
* Since: TBD
**/
cairo_surface_t *
cairo_beos_surface_create (BView* view)
{
return cairo_beos_surface_create_for_bitmap(view, NULL);
}
/**
* cairo_beos_surface_create_for_bitmap:
* @view: The view to draw on
* @bmp: The bitmap to which the view is attached
*
* Creates a Cairo surface that draws onto a BeOS BView which is attached to a
* BBitmap.
* The caller must ensure that the view and the bitmap do not get deleted
* before the surface.
*
* For views that draw to a bitmap (as opposed to a screen), use this function
* rather than cairo_beos_surface_create(). Not using this function WILL lead to
* incorrect behaviour.
*
* For now, only views that draw to the entire area of bmp are supported.
* The view must already be attached to the bitmap.
*
* Since: TBD
**/
cairo_surface_t *
cairo_beos_surface_create_for_bitmap (BView* view,
BBitmap* bmp)
{
return _cairo_beos_surface_create_internal(view, bmp);
}