54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/* ************************************************************************** */
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/* _____ _ */
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/* image/4bits.c |_ _|__ _ _| |__ ___ _ _ */
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/* | Project: libg1m | |/ _ \| | | | '_ \ / _ \ | | | */
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/* | | (_) | |_| | | | | __/ |_| | */
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/* By: thomas <thomas@touhey.fr> |_|\___/ \__,_|_| |_|\___|\__, |.fr */
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/* Last updated: 2016/11/23 07:04:02 |___/ */
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/* */
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/* ************************************************************************** */
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#include <libg1m/internals.h>
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/* colors correspondance */
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static const uint32_t colors[16] = {
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[g1m_color_black] = 0x000000,
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[g1m_color_blue] = 0x0000ff,
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[g1m_color_green] = 0x00ff00,
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[g1m_color_cyan] = 0x00ffff,
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[g1m_color_red] = 0xff0000,
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[g1m_color_magenta] = 0xff00ff,
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[g1m_color_yellow] = 0xffff00,
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[g1m_color_white] = 0xffffff,
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/* RESERVED */
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};
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/**
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* g1m_pixels_from_4bits:
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* Convert 4-bits formatted image to the final 32-bit matrix.
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*
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* @arg pixels the final pixels.
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* @arg raw the raw data.
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* @arg width the width.
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* @arg height the height.
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*/
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void g1m_pixels_from_4bits(uint32_t **pixels, unsigned char *raw,
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int width, int height)
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{
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int mask = 0xf0;
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int pixnum = 0;
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for (int y = 0; y < height; y++) {
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pixels[y] = (uint32_t*)&pixels[height] + y * width;
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for (int x = 0; x < width; x++) {
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/* get byte using max and iterate (i love trying to optimize) */
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int b = (*raw & mask) >> (pixnum & 4);
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raw += (pixnum & 8) >> 4;
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pixnum += 4;
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/* put pixel */
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pixels[y][x] = colors[b];
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}
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}
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}
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