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Small optimization to __PPGeInit().

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Small factor in startup time.
This commit is contained in:
Unknown W. Brackets 2014-11-02 17:44:24 -08:00
parent 56322bdad4
commit 2d5733407b
1 changed files with 6 additions and 5 deletions
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11
Core/Util/PPGeDraw.cpp
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@ -189,15 +189,16 @@ void __PPGeInit()
palette[i] = (val << 12) | 0xFFF;
}
u16_le *imagePtr = (u16_le *)imageData;
const u32_le *imagePtr = (u32_le *)imageData;
u8 *ramPtr = (u8 *)Memory::GetPointer(atlasPtr);
// Palettize to 4-bit, the easy way.
for (int i = 0; i < width * height / 2; i++) {
u16 c1 = imagePtr[i*2];
u16 c2 = imagePtr[i*2+1];
int a1 = c1 & 0xF;
int a2 = c2 & 0xF;
// Each pixel is 16 bits, so this loads two bits.
u32 c = imagePtr[i];
// It's white anyway, so we only look at one channel of each pixel.
int a1 = (c & 0x0000000F) >> 0;
int a2 = (c & 0x000F0000) >> 16;
u8 cval = (a2 << 4) | a1;
ramPtr[i] = cval;
}