зеркало из https://github.com/mozilla/gecko-dev.git
94 строки
2.9 KiB
C++
94 строки
2.9 KiB
C++
#include "BufferEdgePad.h"
|
|
|
|
#include "mozilla/gfx/Point.h" // for IntSize
|
|
#include "mozilla/gfx/Types.h" // for SurfaceFormat
|
|
|
|
namespace mozilla {
|
|
namespace layers {
|
|
|
|
using namespace gfx;
|
|
|
|
void
|
|
PadDrawTargetOutFromRegion(RefPtr<DrawTarget> aDrawTarget, nsIntRegion &aRegion)
|
|
{
|
|
struct LockedBits {
|
|
uint8_t *data;
|
|
IntSize size;
|
|
int32_t stride;
|
|
SurfaceFormat format;
|
|
static int clamp(int x, int min, int max)
|
|
{
|
|
if (x < min)
|
|
x = min;
|
|
if (x > max)
|
|
x = max;
|
|
return x;
|
|
}
|
|
|
|
static void ensure_memcpy(uint8_t *dst, uint8_t *src, size_t n, uint8_t *bitmap, int stride, int height)
|
|
{
|
|
if (src + n > bitmap + stride*height) {
|
|
MOZ_CRASH("GFX: long src memcpy");
|
|
}
|
|
if (src < bitmap) {
|
|
MOZ_CRASH("GFX: short src memcpy");
|
|
}
|
|
if (dst + n > bitmap + stride*height) {
|
|
MOZ_CRASH("GFX: long dst mempcy");
|
|
}
|
|
if (dst < bitmap) {
|
|
MOZ_CRASH("GFX: short dst mempcy");
|
|
}
|
|
}
|
|
|
|
static void visitor(void *closure, VisitSide side, int x1, int y1, int x2, int y2) {
|
|
LockedBits *lb = static_cast<LockedBits*>(closure);
|
|
uint8_t *bitmap = lb->data;
|
|
const int bpp = gfx::BytesPerPixel(lb->format);
|
|
const int stride = lb->stride;
|
|
const int width = lb->size.width;
|
|
const int height = lb->size.height;
|
|
|
|
if (side == VisitSide::TOP) {
|
|
if (y1 > 0) {
|
|
x1 = clamp(x1, 0, width - 1);
|
|
x2 = clamp(x2, 0, width - 1);
|
|
ensure_memcpy(&bitmap[x1*bpp + (y1-1) * stride], &bitmap[x1*bpp + y1 * stride], (x2 - x1) * bpp, bitmap, stride, height);
|
|
memcpy(&bitmap[x1*bpp + (y1-1) * stride], &bitmap[x1*bpp + y1 * stride], (x2 - x1) * bpp);
|
|
}
|
|
} else if (side == VisitSide::BOTTOM) {
|
|
if (y1 < height) {
|
|
x1 = clamp(x1, 0, width - 1);
|
|
x2 = clamp(x2, 0, width - 1);
|
|
ensure_memcpy(&bitmap[x1*bpp + y1 * stride], &bitmap[x1*bpp + (y1-1) * stride], (x2 - x1) * bpp, bitmap, stride, height);
|
|
memcpy(&bitmap[x1*bpp + y1 * stride], &bitmap[x1*bpp + (y1-1) * stride], (x2 - x1) * bpp);
|
|
}
|
|
} else if (side == VisitSide::LEFT) {
|
|
if (x1 > 0) {
|
|
while (y1 != y2) {
|
|
memcpy(&bitmap[(x1-1)*bpp + y1 * stride], &bitmap[x1*bpp + y1*stride], bpp);
|
|
y1++;
|
|
}
|
|
}
|
|
} else if (side == VisitSide::RIGHT) {
|
|
if (x1 < width) {
|
|
while (y1 != y2) {
|
|
memcpy(&bitmap[x1*bpp + y1 * stride], &bitmap[(x1-1)*bpp + y1*stride], bpp);
|
|
y1++;
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
} lb;
|
|
|
|
if (aDrawTarget->LockBits(&lb.data, &lb.size, &lb.stride, &lb.format)) {
|
|
// we can only pad software targets so if we can't lock the bits don't pad
|
|
aRegion.VisitEdges(lb.visitor, &lb);
|
|
aDrawTarget->ReleaseBits(lb.data);
|
|
}
|
|
}
|
|
|
|
} // namespace layers
|
|
} // namespace mozilla
|