diff options
Diffstat (limited to 'engines/zvision/render_manager.cpp')
| -rw-r--r-- | engines/zvision/render_manager.cpp | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/engines/zvision/render_manager.cpp b/engines/zvision/render_manager.cpp index 58df5a8d11..fc15e18fd0 100644 --- a/engines/zvision/render_manager.cpp +++ b/engines/zvision/render_manager.cpp @@ -694,4 +694,31 @@ Graphics::Surface *RenderManager::tranposeSurface(const Graphics::Surface *surfa return tranposedSurface; } +void RenderManager::scaleBuffer(const void *src, void *dst, uint32 srcWidth, uint32 srcHeight, byte bytesPerPixel, uint32 dstWidth, uint32 dstHeight) { + assert(bytesPerPixel == 1 || bytesPerPixel == 2); + + const float xscale = (float)srcWidth / (float)dstWidth; + const float yscale = (float)srcHeight / (float)dstHeight; + + if (bytesPerPixel == 1) { + const byte *srcPtr = (const byte *)src; + byte *dstPtr = (byte *)dst; + for (uint32 y = 0; y < dstHeight; ++y) { + for (uint32 x = 0; x < dstWidth; ++x) { + *dstPtr = srcPtr[(int)(x * xscale) + (int)(y * yscale) * srcWidth]; + dstPtr++; + } + } + } else if (bytesPerPixel == 2) { + const uint16 *srcPtr = (const uint16 *)src; + uint16 *dstPtr = (uint16 *)dst; + for (uint32 y = 0; y < dstHeight; ++y) { + for (uint32 x = 0; x < dstWidth; ++x) { + *dstPtr = srcPtr[(int)(x * xscale) + (int)(y * yscale) * srcWidth]; + dstPtr++; + } + } + } +} + } // End of namespace ZVision |