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Mypal/gfx/cairo/cairo/src/cairo-beos-surface.cpp
Fedor 68b5a6fbfe Update the in-tree cairo code.
2019-12-25 15:45:20 +03:00

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// This is a C++ file in order to use the C++ BeOS API
#include "cairoint.h"
#include "cairo-beos.h"
#include <new>
#include <Bitmap.h>
#include <Region.h>
#if 0
#include <DirectWindow.h>
#endif
#include <Screen.h>
#include <Window.h>
#include <Locker.h>
#define CAIRO_INT_STATUS_SUCCESS (cairo_int_status_t)(CAIRO_STATUS_SUCCESS)
struct cairo_beos_surface_t {
cairo_surface_t base;
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 BRect
_cairo_rect_to_brect (const cairo_rectangle_int16_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 cairo_rectangle_int16_t
_brect_to_cairo_rect (const BRect& rect)
{
cairo_rectangle_int16_t retval;
retval.x = int(rect.left + 0.5);
retval.y = int(rect.top + 0.5);
retval.width = rect.IntegerWidth() + 1;
retval.height = rect.IntegerHeight() + 1;
return retval;
}
static 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;
}
inline unsigned char
unpremultiply (unsigned char color,
unsigned char alpha)
{
if (alpha == 0)
return 0;
// plus alpha/2 to round instead of truncate
return (color * 255 + alpha / 2) / alpha;
}
inline unsigned char
premultiply (unsigned char color,
unsigned char alpha)
{
// + 127 to round, instead of truncate
return (color * alpha + 127) / 255;
}
/**
* unpremultiply_rgba:
*
* Takes an input in ABGR premultiplied image data and unmultiplies it.
* The result is stored in retdata.
**/
static void
unpremultiply_rgba (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) {
// XXX for a big-endian platform this'd have to change
int idx = 4 * i;
unsigned char alpha = in[idx + 3];
out[idx + 0] = unpremultiply(in[idx + 0], alpha); // B
out[idx + 1] = unpremultiply(in[idx + 1], alpha); // G
out[idx + 2] = unpremultiply(in[idx + 2], alpha); // R
out[idx + 3] = in[idx + 3]; // Alpha
}
}
}
/**
* premultiply_rgba:
*
* Takes an input in ABGR non-premultiplied image data and premultiplies it.
* The returned data must be freed with free().
**/
static unsigned char*
premultiply_rgba (unsigned char* data,
int width,
int height,
int stride)
{
unsigned char* retdata = reinterpret_cast<unsigned char*>(_cairo_malloc_ab(height, stride));
if (!retdata)
return NULL;
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) {
// XXX for a big-endian platform this'd have to change
int idx = 4 * i;
unsigned char alpha = in[idx + 3];
out[idx + 0] = premultiply(in[idx + 0], alpha); // B
out[idx + 1] = premultiply(in[idx + 1], alpha); // G
out[idx + 2] = premultiply(in[idx + 2], alpha); // R
out[idx + 3] = in[idx + 3]; // Alpha
}
}
return retdata;
}
/**
* _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_rgba(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 NULL;
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_rgba(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
#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)
{
fprintf(stderr, "Creating similar\n");
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:
// Can't support this natively
return _cairo_image_surface_create_with_content(content, width,
height);
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(0);
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;
}
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)
{
fprintf(stderr, "Getting source image\n");
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 (!*image_out)
return CAIRO_STATUS_NO_MEMORY;
*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 (!*image_out) {
delete bmp;
return CAIRO_STATUS_NO_MEMORY;
}
*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);
BBitmap* bmp = static_cast<BBitmap*>(image_extra);
delete bmp;
}
static cairo_status_t
_cairo_beos_surface_acquire_dest_image (void *abstract_surface,
cairo_rectangle_int16_t *interest_rect,
cairo_image_surface_t **image_out,
cairo_rectangle_int16_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_SUCCESS;
}
if (surface->bitmap) {
surface->view->Sync();
*image_out = _cairo_beos_bitmap_to_surface(surface->bitmap);
if (!*image_out)
return CAIRO_STATUS_NO_MEMORY;
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_rect_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_rect(rect);
#if 0
fprintf(stderr, "Requested: (cairo rects) (%ix%i) dim (%u, %u) returning (%ix%i) dim (%u, %u)\n",
interest_rect->x, interest_rect->y, interest_rect->width, interest_rect->height,
image_rect->x, image_rect->y, image_rect->width, image_rect->height);
#endif
*image_out = _cairo_beos_bitmap_to_surface(bitmap);
delete bitmap;
if (!*image_out)
return CAIRO_STATUS_NO_MEMORY;
*image_extra = NULL;
return CAIRO_STATUS_SUCCESS;
}
static void
_cairo_beos_surface_release_dest_image (void *abstract_surface,
cairo_rectangle_int16_t *intersect_rect,
cairo_image_surface_t *image,
cairo_rectangle_int16_t *image_rect,
void *image_extra)
{
fprintf(stderr, "Fallback drawing\n");
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);
BRect rect(_cairo_rect_to_brect(image_rect));
surface->view->DrawBitmap(bitmap_to_draw, 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_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
dst);
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;
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;
}
fprintf(stderr, "Composite\n");
// 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 void
_cairo_beos_surface_fill_rectangle (cairo_beos_surface_t *surface,
cairo_rectangle_int16_t *rect)
{
BRect brect(_cairo_rect_to_brect(rect));
surface->view->FillRect(brect);
}
static cairo_int_status_t
_cairo_beos_surface_fill_rectangles (void *abstract_surface,
cairo_operator_t op,
const cairo_color_t *color,
cairo_rectangle_int16_t *rects,
int num_rects)
{
fprintf(stderr, "Drawing %i rectangles\n", num_rects);
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
abstract_surface);
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;
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 = premultiply(be_color.red, be_color.alpha);
be_color.green = premultiply(be_color.green, be_color.alpha);
be_color.blue = premultiply(be_color.blue, be_color.alpha);
}
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) {
_cairo_beos_surface_fill_rectangle(surface, &rects[i]);
}
surface->view->PopState();
return CAIRO_INT_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_beos_surface_set_clip_region (void *abstract_surface,
pixman_region16_t *region)
{
fprintf(stderr, "Setting clip region\n");
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
abstract_surface);
AutoLockView locker(surface->view);
if (!locker)
return CAIRO_INT_STATUS_SUCCESS;
if (region == NULL) {
// No clipping
surface->view->ConstrainClippingRegion(NULL);
return CAIRO_INT_STATUS_SUCCESS;
}
int count = pixman_region_num_rects(region);
pixman_box16_t* rects = pixman_region_rects(region);
BRegion bregion;
for (int i = 0; i < count; ++i) {
// Have to substract one, because for pixman, the second coordinate
// lies outside the rectangle.
bregion.Include(BRect(rects[i].x1, rects[i].y1, rects[i].x2 - 1, rects[i].y2 - 1));
}
surface->view->ConstrainClippingRegion(&bregion);
return CAIRO_INT_STATUS_SUCCESS;
}
static cairo_int_status_t
_cairo_beos_surface_get_extents (void *abstract_surface,
cairo_rectangle_int16_t *rectangle)
{
cairo_beos_surface_t *surface = reinterpret_cast<cairo_beos_surface_t*>(
abstract_surface);
AutoLockView locker(surface->view);
if (!locker)
return CAIRO_INT_STATUS_UNSUPPORTED;
BRect size = surface->view->Bounds();
*rectangle = _brect_to_cairo_rect(size);
// Make sure to have our upperleft edge as (0,0)
rectangle->x = 0;
rectangle->y = 0;
return CAIRO_INT_STATUS_SUCCESS;
}
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_set_clip_region,
NULL, /* intersect_clip_path */
_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, content);
surface->view = view;
surface->bitmap = bmp;
surface->owns_bitmap_view = owns_bitmap_view;
return (cairo_surface_t *) surface;
}
/**
* 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.
**/
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.
**/
cairo_surface_t *
cairo_beos_surface_create_for_bitmap (BView* view,
BBitmap* bmp)
{
return _cairo_beos_surface_create_internal(view, bmp);
}
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