TINYGL: Added some more documentation to blitting code.
This commit is contained in:
Stefano Musumeci
parent
4b9c5a7633
commit
c64e2884b2
1 changed files with 52 additions and 45 deletions
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@ -148,6 +148,8 @@ public:
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return true;
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}
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// Blits an image to the z buffer.
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// The function only supports clipped blitting without any type of transformation or tinting.
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void tglBlitZBuffer(int dstX, int dstY) {
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TinyGL::GLContext *c = TinyGL::gl_get_context();
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@ -158,8 +160,8 @@ public:
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if (clipBlitImage(c, srcX, srcY, srcWidth, srcHeight, width, height, dstX, dstY, clampWidth, clampHeight) == false)
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return;
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Graphics::PixelBuffer srcBuf(_surface.format, (byte *)const_cast<void *>(_surface.getPixels()));
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Graphics::PixelBuffer dstBuf(_surface.format, (byte *)c->fb->getZBuffer());
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Graphics::PixelBuffer srcBuf(_surface.format, (byte *)const_cast<void *>(_surface.getPixels())); // Blit image buffer
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Graphics::PixelBuffer dstBuf(_surface.format, (byte *)c->fb->getZBuffer()); // TinyGL z buffer
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srcBuf.shiftBy(srcY * _surface.w);
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@ -243,6 +245,8 @@ void tglDeleteBlitImage(BlitImage *blitImage) {
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blitImage->_isDisposed = true;
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}
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// This function uses RLE encoding to skip transparent bitmap parts
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// This blit only supports tinting but it will fall back to simpleBlit if flipping is required (or anything more complex than that, including rotationd and scaling).
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template <bool kDisableColoring, bool kDisableBlending, bool kEnableAlphaBlending>
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FORCEINLINE void BlitImage::tglBlitRLE(int dstX, int dstY, int srcX, int srcY, int srcWidth, int srcHeight, float aTint, float rTint, float gTint, float bTint) {
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TinyGL::GLContext *c = TinyGL::gl_get_context();
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@ -270,7 +274,7 @@ FORCEINLINE void BlitImage::tglBlitRLE(int dstX, int dstY, int srcX, int srcY, i
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lineIndex++;
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}
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if (_binaryTransparent || (kDisableBlending || kEnableAlphaBlending == false)) {
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if (_binaryTransparent || (kDisableBlending || kEnableAlphaBlending == false)) { // If bitmap is binary transparent or if we need complex forms of blending (not just alpha) we need to use writePixel, which is slower
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while (lineIndex < _lines.size() && _lines[lineIndex]._y < maxY) {
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const BlitImage::Line &l = _lines[lineIndex];
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if (l._x < maxX && l._x + l._length > srcX) {
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@ -298,7 +302,7 @@ FORCEINLINE void BlitImage::tglBlitRLE(int dstX, int dstY, int srcX, int srcY, i
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}
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lineIndex++;
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}
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} else {
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} else { // Otherwise can use setPixel in some cases which speeds up things quite a bit
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while (lineIndex < _lines.size() && _lines[lineIndex]._y < maxY) {
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const BlitImage::Line &l = _lines[lineIndex];
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if (l._x < maxX && l._x + l._length > srcX) {
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@ -332,6 +336,7 @@ FORCEINLINE void BlitImage::tglBlitRLE(int dstX, int dstY, int srcX, int srcY, i
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}
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}
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// This blit function is called when flipping is needed but transformation isn't.
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template <bool kDisableBlending, bool kDisableColoring, bool kFlipVertical, bool kFlipHorizontal>
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FORCEINLINE void BlitImage::tglBlitSimple(int dstX, int dstY, int srcX, int srcY, int srcWidth, int srcHeight, float aTint, float rTint, float gTint, float bTint) {
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TinyGL::GLContext *c = TinyGL::gl_get_context();
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@ -359,7 +364,9 @@ FORCEINLINE void BlitImage::tglBlitSimple(int dstX, int dstY, int srcX, int srcY
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} else {
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srcBuf.getARGBAt(srcX + x, aDst, rDst, gDst, bDst);
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}
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if (kDisableColoring) {
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// Those branches are needed to favor speed: avoiding writePixel always yield a huge performance boost when blitting images.
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if (kDisableColoring) {
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if (kDisableBlending && aDst != 0) {
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dstBuf.setPixelAt((dstX + x) + (dstY + y) * c->fb->xsize, aDst, rDst, gDst, bDst);
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} else {
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@ -381,46 +388,6 @@ FORCEINLINE void BlitImage::tglBlitSimple(int dstX, int dstY, int srcX, int srcY
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}
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}
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/*
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The below two functions are adapted from SDL_rotozoom.c,
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taken from SDL_gfx-2.0.18.
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Its copyright notice:
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=============================================================================
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SDL_rotozoom.c: rotozoomer, zoomer and shrinker for 32bit or 8bit surfaces
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Copyright (C) 2001-2012 Andreas Schiffler
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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Andreas Schiffler -- aschiffler at ferzkopp dot net
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=============================================================================
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The functions have been adapted for different structures and coordinate
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systems.
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*/
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template <bool kDisableBlending, bool kDisableColoring, bool kFlipVertical, bool kFlipHorizontal>
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FORCEINLINE void BlitImage::tglBlitScale(int dstX, int dstY, int width, int height, int srcX, int srcY, int srcWidth, int srcHeight,
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float aTint, float rTint, float gTint, float bTint) {
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@ -470,6 +437,46 @@ FORCEINLINE void BlitImage::tglBlitScale(int dstX, int dstY, int width, int heig
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}
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}
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/*
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The below two functions are adapted from SDL_rotozoom.c,
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taken from SDL_gfx-2.0.18.
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Its copyright notice:
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=============================================================================
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SDL_rotozoom.c: rotozoomer, zoomer and shrinker for 32bit or 8bit surfaces
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Copyright (C) 2001-2012 Andreas Schiffler
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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Andreas Schiffler -- aschiffler at ferzkopp dot net
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=============================================================================
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The functions have been adapted for different structures and coordinate
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systems.
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*/
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template <bool kDisableBlending, bool kDisableColoring, bool kFlipVertical, bool kFlipHorizontal>
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FORCEINLINE void BlitImage::tglBlitRotoScale(int dstX, int dstY, int width, int height, int srcX, int srcY, int srcWidth, int srcHeight, int rotation,
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int originX, int originY, float aTint, float rTint, float gTint, float bTint) {
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