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Update code to use C++ unordered_map

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This commit is contained in:
Samuel Gomes 2022-09-18 00:03:08 +05:30
parent bb8bd56689
commit 9681aa1d30
1 changed files with 7 additions and 9 deletions
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16
internal/c/parts/video/image/image.cpp
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@ -19,6 +19,7 @@
// Set this to 1 if we want to print debug messages to stderr
#define IMAGE_DEBUG 0
#include "image.h"
#include <unordered_map>
#define DR_PCX_IMPLEMENTATION
#include "dr_pcx.h"
#define STB_IMAGE_IMPLEMENTATION
@ -186,25 +187,21 @@ static uint8_t *image_convert_8bpp(uint8_t *src, int w, int h, uint32_t *palette
static uint8_t *image_make_8bpp(uint8_t *src, int w, int h, uint32_t *paletteOut) {
IMAGE_DEBUG_PRINT("Extracting 8bpp image (%i, %i) from 32bpp", w, h);
unordered_map<uint32_t, int> colorMap;
// Allocate memory for new image (8-bit indexed)
auto pixels = (uint8_t *)malloc(w * h);
if (!pixels) {
return nullptr;
}
int i, j;
auto uniqueColors = 0; // As long as this is <= 256 we will keep going until we are done
auto src32bpp = (uint32_t *)src;
for (i = 0; i < w * h; i++) {
for (auto i = 0; i < w * h; i++) {
auto srcColor = src32bpp[i];
// Check if the src color exists in our palette
for (j = 0; j < uniqueColors; j++) {
if (srcColor == paletteOut[j])
break; // If we have a match then exit the loop
}
if (j >= uniqueColors) {
if (colorMap.find(srcColor) == colorMap.end()) {
// If we reached here, then the color is not in our table
++uniqueColors;
if (uniqueColors > 256) {
@ -214,10 +211,11 @@ static uint8_t *image_make_8bpp(uint8_t *src, int w, int h, uint32_t *paletteOut
}
paletteOut[uniqueColors - 1] = srcColor; // Store the color as unique
colorMap[srcColor] = uniqueColors - 1; // Add this color to the map
pixels[i] = uniqueColors - 1;
} else {
// If we reached here, then the color is in our table
pixels[i] = j;
pixels[i] = colorMap[srcColor]; // Simply fetch the index from the map
}
}