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(DREF): perform rectangle arithmetics when blending.

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This commit is contained in:
morkt 2018-01-23 09:36:26 +04:00
parent 42d8cb12fe
commit db4a6ebe48
1 changed files with 37 additions and 22 deletions
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59
ArcFormats/Emote/ImageDREF.cs
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@ -26,10 +26,12 @@
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
@ -51,6 +53,7 @@ namespace GameRes.Formats.Emote
public DrefFormat ()
{
// 'psb:' string with possible byte-order-mark prepended
Signatures = new uint[] { 0x0070FEFF, 0x70BFBBEF, 0x3A627370, 0x00730070 };
}
@ -152,49 +155,61 @@ namespace GameRes.Formats.Emote
BitmapSource source = layer.Bitmap;
if (source.Format.BitsPerPixel != 32)
source = new FormatConvertedBitmap (source, PixelFormats.Bgra32, null, 0);
int src_height = layer.Bitmap.PixelHeight;
int src_width = layer.Bitmap.PixelWidth;
int src_stride = src_width * 4;
var pixels = new byte[src_stride * src_height];
layer.Bitmap.CopyPixels (pixels, src_stride, 0);
// determine coordinates of the intersection of layer and canvas
var src_rect = new Int32Rect (0, 0, source.PixelWidth, source.PixelHeight);
if (layer.OffsetX < 0)
{
src_rect.X = -layer.OffsetX;
src_rect.Width += layer.OffsetX;
}
if (layer.OffsetY < 0)
{
src_rect.Y = -layer.OffsetY;
src_rect.Height += layer.OffsetY;
}
if (!src_rect.HasArea)
return;
var layer_rect = new Rectangle (layer.OffsetX, layer.OffsetY, source.PixelWidth, source.PixelHeight);
var canvas_rect = new Rectangle (0, 0, canvas.PixelWidth, canvas.PixelHeight);
layer_rect.Intersect (canvas_rect);
if (layer_rect.Width <= 0 || layer_rect.Height <= 0)
return;
// copy out layer area
int src_stride = src_rect.Width * 4;
var pixels = new byte[src_stride * src_rect.Height];
source.CopyPixels (src_rect, pixels, src_stride, 0);
// perform blending within established coordinates
int pixel_size = (canvas.Format.BitsPerPixel + 7) / 8;
int canvas_stride = canvas.BackBufferStride;
int dst_row = layer.OffsetY * canvas_stride + layer.OffsetX * pixel_size;
if (dst_row < 0)
throw new InvalidFormatException();
// FIXME
// check layer dimensions more thoroughly before entering unsafe block
int dst_row = layer_rect.Y * canvas_stride + layer_rect.X * pixel_size;
canvas.Lock();
unsafe
{
int src = 0;
byte* buffer = (byte*)canvas.BackBuffer;
for (int y = 0; y < src_height; ++y)
for (int src = 0; src < pixels.Length; src += src_stride)
{
int dst = dst_row;
byte* dst = buffer+dst_row;
for (int x = 0; x < src_stride; x += 4)
{
byte src_alpha = pixels[src+x+3];
if (0xFF == src_alpha)
{
for (int i = 0; i < pixel_size; ++i)
buffer[dst+i] = pixels[src+x+i];
dst[i] = pixels[src+x+i];
}
else if (src_alpha > 0)
{
buffer[dst+0] = (byte)((pixels[src+x+0] * src_alpha
+ buffer[dst+0] * (0xFF - src_alpha)) / 0xFF);
buffer[dst+1] = (byte)((pixels[src+x+1] * src_alpha
+ buffer[dst+1] * (0xFF - src_alpha)) / 0xFF);
buffer[dst+2] = (byte)((pixels[src+x+2] * src_alpha
+ buffer[dst+2] * (0xFF - src_alpha)) / 0xFF);
dst[0] = (byte)((pixels[src+x+0] * src_alpha + dst[0] * (0xFF - src_alpha)) / 0xFF);
dst[1] = (byte)((pixels[src+x+1] * src_alpha + dst[1] * (0xFF - src_alpha)) / 0xFF);
dst[2] = (byte)((pixels[src+x+2] * src_alpha + dst[2] * (0xFF - src_alpha)) / 0xFF);
if (pixel_size > 3)
buffer[dst+3] = (byte)Math.Max (src_alpha, buffer[dst+3]);
dst[3] = (byte)Math.Max (src_alpha, dst[3]);
}
dst += pixel_size;
}
src += src_stride;
dst_row += canvas_stride;
}
}