74 lines
3.1 KiB
C
74 lines
3.1 KiB
C
#pragma once
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#include "../util/minmax.h"
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#include "color.h"
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#include "stdint.h"
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#include "string.h"
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static inline void __graphics_CopyBuffer32(
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void *from, // Source image of the copy
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int fromOffsetX, // OffsetX of the region to copy from
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int fromOffsetY, // OffsetY of the region to copy from
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int fromSizeX, // SizeX of the entire source image
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int fromSizeY, // SizeY of the entire source image
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void *to, // Destination image of the copy
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int toOffsetX, // OffsetX of the target region
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int toOffsetY, // OffsetY of the target region
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int toSizeX, // SizeX of the entire destination image
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int toSizeY, // SizeY of the entire destination image
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int countX, // Size of the copying region
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int countY) {
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int beginX = intmax3(0, -fromOffsetX, -toOffsetX), beginY = intmax3(0, -fromOffsetY, -toOffsetY);
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int endX = intmin3(countX, fromSizeX - fromOffsetX, toSizeX - toOffsetX),
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endY = intmin3(countY, fromSizeY - fromOffsetY, toSizeY - toOffsetY);
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#define PIXEL_BYTES ((intptr_t)4)
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for (int i = beginY; i < endY; i++)
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memcpy(
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((intptr_t)toOffsetX + beginX + (intptr_t)toSizeX * (toOffsetY + i)) * PIXEL_BYTES + (uint8_t *)to,
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((intptr_t)fromOffsetX + beginX + (intptr_t)fromSizeX * (fromOffsetY + i)) * PIXEL_BYTES + (uint8_t *)from,
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(endX - beginX) * PIXEL_BYTES);
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#undef PIXEL_BYTES
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}
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// Blends ARGB Premultiplied Alpha image onto (opaque) buffer
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// See: https://apoorvaj.io/alpha-compositing-opengl-blending-and-premultiplied-alpha/
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static inline void __graphics_RenderBuffer32(
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void *from, // Source image of the render
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int fromOffsetX, // OffsetX of the region to render from
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int fromOffsetY, // OffsetY of the region to render from
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int fromSizeX, // SizeX of the entire source image
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int fromSizeY, // SizeY of the entire source image
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void *to, // Destination image of the render
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int toOffsetX, // OffsetX of the target region
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int toOffsetY, // OffsetY of the target region
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int toSizeX, // SizeX of the entire destination image
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int toSizeY, // SizeY of the entire destination image
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int countX, // Size of the render region
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int countY) {
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int beginX = intmax3(0, -fromOffsetX, -toOffsetX), beginY = intmax3(0, -fromOffsetY, -toOffsetY);
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int endX = intmin3(countX, fromSizeX - fromOffsetX, toSizeX - toOffsetX),
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endY = intmin3(countY, fromSizeY - fromOffsetY, toSizeY - toOffsetY);
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for (int x = beginX; x < endX; x++)
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for (int y = beginY; y < endY; y++) {
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HelosGraphics_Color
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*src = ((intptr_t)fromOffsetX + x + (intptr_t)fromSizeX * (fromOffsetY + y)) + (HelosGraphics_Color *)from,
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*dest = ((intptr_t)toOffsetX + x + (intptr_t)toSizeX * (toOffsetY + y)) + (HelosGraphics_Color *)to;
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if (src->A == 0)
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continue;
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else if (src->A == 0xff)
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*(uint32_t *)dest = *(uint32_t *)src & 0x00ffffffu;
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else { // blend
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HelosGraphics_Color color = {
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.B = (uint8_t)(src->B + ((int)dest->B) * (0xff - src->A) / 0xff),
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.G = (uint8_t)(src->G + ((int)dest->G) * (0xff - src->A) / 0xff),
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.R = (uint8_t)(src->R + ((int)dest->R) * (0xff - src->A) / 0xff),
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.A = 0};
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*dest = color;
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}
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}
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}
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