/// <summary>
/// Creates a copy of the surface.
/// </summary>
/// <returns>A new surface that is a copy of this surface.</returns>
public SDL_Surface CreateCopy()
{
Contract.EnsureNotDisposed(this, disposed);
var copy = new SDL_Surface(Width, Height);
if (SDL.BlitSurface(ptr, null, copy.ptr, null) < 0)
throw new SDL2Exception(); }
/// <summary>
/// Initializes a new instance of the OpenGLSurface2D class.
/// </summary>
/// <param name="uv">The Ultraviolet context.</param>
/// <param name="nativesurf">The native SDL surface that this object represents.</param>
public OpenGLSurface2D(UltravioletContext uv, SDL_Surface nativesurf)
: base(uv)
{
if (nativesurf == null)
throw new ArgumentNullException("nativesurf");
this.nativesurf = nativesurf;
}
/// <summary>
/// Initializes a new instance of the OpenGLSurface2D class.
/// </summary>
/// <param name="uv">The Ultraviolet context.</param>
/// <param name="width">The width of the surface in pixels.</param>
/// <param name="height">The height of the surface in pixels.</param>
public OpenGLSurface2D(UltravioletContext uv, Int32 width, Int32 height)
: base(uv)
{
Contract.EnsureRange(width > 0, nameof(width));
Contract.EnsureRange(height > 0, nameof(height));
this.nativesurf = new SDL_Surface(width, height);
}
/// <summary>
/// Identifies the positions of the glyphs on the specified surface.
/// </summary>
/// <param name="surface">The surface on which to identify glyphs.</param>
/// <param name="source">The region on the surface in which to look for glyphs, or null to examine the entire surface.</param>
/// <returns>A collection of rectangles describing the positions of the glyphs on the specified surface.</returns>
public static IEnumerable<Rectangle> IdentifyGlyphs(SDL_Surface surface, Rectangle? source = null)
{
if (source.HasValue && (source.Value.Width > surface.Width | source.Value.Height > surface.Height))
throw new ArgumentOutOfRangeException("source");
var regionValue = source ?? new Rectangle(0, 0, surface.Width, surface.Height);
var data = new Color[regionValue.Width * regionValue.Height];
surface.GetData(data, regionValue);
// Find the glyphs on the texture.
var positions = new List<Rectangle>();
var nextLine = 0;
var nextGlyph = 0;
for (int y = 0; y < regionValue.Height; y = nextLine)
{
nextLine = y + 1;
for (int x = 0; x <regionValue.Width; x = nextGlyph)
{
nextGlyph = x + 1;
// Skip buffer pixels.
var pixel = data[y * regionValue.Width + x];
if (pixel.Equals(Color.Magenta))
continue;
// Find the width of the glyph.
var x2 = x + 1;
while (x2 < regionValue.Width)
{
if (data[y * regionValue.Width + x2++].Equals(Color.Magenta))
break;
}
var glyphWidth = (x2 - x) - 1;
// Find the height of the glyph.
var y2 = y + 1;
while (y2 < regionValue.Height)
{
if (data[y2++ * regionValue.Width + x].Equals(Color.Magenta))
break;
}
var glyphHeight = (y2 - y) - 1;
// Calculate the position of the next glyph and the next line of glyphs.
nextGlyph = x + glyphWidth + 1;
if (y + glyphHeight > nextLine)
{
nextLine = y + glyphHeight + 1;
}
// Store the glyph's position.
positions.Add(new Rectangle(regionValue.X + x, regionValue.Y + y, glyphWidth, glyphHeight));
}
}
return positions;
}
/// <summary>
/// Creates a new instance of SDL_Surface from the image data contained in the specified bitmap.
/// </summary>
/// <param name="source">The surface source that contains the image data from which to create the surface.</param>
/// <returns>The instance of SDL_Surface that was created.</returns>
public static SDL_Surface CreateFromSurfaceSource(SurfaceSource source)
{
Contract.Require(source, nameof(source));
var width = source.Width;
var height = source.Height;
var bmpSurface = new SDL_Surface(width, height);
var pDstData = (byte *)bmpSurface.Native->pixels;
var pSrcData = (byte *)source.Data;
var dstExtraBytes = bmpSurface.Native->pitch - (bmpSurface.Native->w * 4);
var srcExtraBytes = source.Stride - (source.Width * 4);
byte srcR, srcG, srcB, srcA;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
srcR = *pSrcData++;
srcG = *pSrcData++;
srcB = *pSrcData++;
srcA = *pSrcData++;
if (source.DataFormat == SurfaceSourceDataFormat.BGRA)
{
var temp = srcR;
srcR = srcB;
srcB = temp;
}
*pDstData++ = srcB;
*pDstData++ = srcG;
*pDstData++ = srcR;
*pDstData++ = srcA;
}
pDstData += dstExtraBytes;
pSrcData += srcExtraBytes;
}
return(bmpSurface);
}
/// <summary>
/// Creates a new instance of SDL_Surface from the image data contained in the specified bitmap.
/// </summary>
/// <param name="source">The surface source that contains the image data from which to create the surface.</param>
/// <returns>The instance of SDL_Surface that was created.</returns>
public static SDL_Surface CreateFromSurfaceSource(SurfaceSource source)
{
Contract.Require(source, "source");
var width = source.Width;
var height = source.Height;
var bmpSurface = new SDL_Surface(width, height);
for (int y = 0; y < height; y++)
{
var pDst = (uint*)((byte*)bmpSurface.Native->pixels + (bmpSurface.Native->pitch * y));
for (int x = 0; x < width; x++)
{
*pDst++ = source[x, y].ToArgb();
}
}
return bmpSurface;
}
/// <summary>
/// Creates a copy of the surface.
/// </summary>
/// <returns>A new surface that is a copy of this surface.</returns>
public SDL_Surface CreateCopy()
{
Contract.EnsureNotDisposed(this, disposed);
var copy = new SDL_Surface(Width, Height);
if (SDL.BlitSurface(ptr, null, copy.ptr, null) < 0)
throw new SDL2Exception();
return copy;
}
/// <summary>
/// Creates a new instance of SDL_Surface from the image data contained in the specified bitmap.
/// </summary>
/// <param name="source">The surface source that contains the image data from which to create the surface.</param>
/// <returns>The instance of SDL_Surface that was created.</returns>
public static SDL_Surface CreateFromSurfaceSource(SurfaceSource source)
{
Contract.Require(source, nameof(source));
var width = source.Width;
var height = source.Height;
var bmpSurface = new SDL_Surface(width, height);
var pDstData = (byte*)bmpSurface.Native->pixels;
var pSrcData = (byte*)source.Data;
var dstExtraBytes = bmpSurface.Native->pitch - (bmpSurface.Native->w * 4);
var srcExtraBytes = source.Stride - (source.Width * 4);
byte srcR, srcG, srcB, srcA;
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
srcR = *pSrcData++;
srcG = *pSrcData++;
srcB = *pSrcData++;
srcA = *pSrcData++;
if (source.DataFormat == SurfaceSourceDataFormat.BGRA)
{
var temp = srcR;
srcR = srcB;
srcB = temp;
}
*pDstData++ = srcB;
*pDstData++ = srcG;
*pDstData++ = srcR;
*pDstData++ = srcA;
}
pDstData += dstExtraBytes;
pSrcData += srcExtraBytes;
}
return bmpSurface;
}
/// <summary>
/// Creates a texture from the surface.
/// </summary>
/// <param name="premultiplyAlpha">A value indicating whether to premultiply the surface's alpha when creating the texture.</param>
/// <returns>The texture that was created from the surface.</returns>
public override Texture2D CreateTexture(Boolean premultiplyAlpha)
{
Contract.EnsureNotDisposed(this, Disposed);
using (var copysurf = new SDL_Surface(Width, Height))
{
if (SDL.SetSurfaceBlendMode(nativesurf.Native, SDL_BlendMode.NONE) < 0)
throw new SDL2Exception();
if (SDL.BlitSurface(nativesurf.Native, null, copysurf.Native, null) < 0)
throw new SDL2Exception();
copysurf.PrepareForTextureExport(premultiplyAlpha);
return new OpenGLTexture2D(Ultraviolet, copysurf);
}
}
/// <summary>
/// Creates a copy of a region of this surface.
/// </summary>
/// <param name="region">The region of this surface to copy.</param>
/// <returns>A new surface which is a copy of the specified region of this surface.</returns>
public override Surface2D CreateSurface(Rectangle region)
{
Contract.EnsureNotDisposed(this, Disposed);
if (region.Left < 0 || region.Top < 0 || region.Right > Width || region.Bottom > Height || region.Width <= 0 || region.Height <= 0)
throw new ArgumentOutOfRangeException("region");
var copysurf = new SDL_Surface(region.Width, region.Height);
var srcrect = new SDL_Rect() { x = region.X, y = region.Y, w = region.Width, h = region.Height };
var dstrect = new SDL_Rect() { x = 0, y = 0, w = region.Width, h = region.Height };
if (SDL.BlitSurface(nativesurf.Native, &srcrect, copysurf.Native, &dstrect) < 0)
throw new SDL2Exception();
return new OpenGLSurface2D(Ultraviolet, copysurf);
}
