mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
synced 2024-09-19 23:44:46 +00:00
399 lines
16 KiB
C++
399 lines
16 KiB
C++
//----------------------------------------------------------------------------------------------------
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// ___ ___ __ _ _ ___ ___ ___ _ _ _
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// / _ \| _ ) / /| | || _ \ __| |_ _|_ __ __ _ __ _ ___ | | (_) |__ _ _ __ _ _ _ _ _
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// | (_) | _ \/ _ \_ _| _/ _| | || ' \/ _` / _` / -_) | |__| | '_ \ '_/ _` | '_| || |
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// \__\_\___/\___/ |_||_| |___| |___|_|_|_\__,_\__, \___| |____|_|_.__/_| \__,_|_| \_, |
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// |___/ |__/
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//
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// QB64-PE Image Library
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// Powered by stb_image (https://github.com/nothings/stb) & dr_pcx (https://github.com/mackron/dr_pcx)
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//
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// Copyright (c) 2022 Samuel Gomes
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// https://github.com/a740g
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//
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//-----------------------------------------------------------------------------------------------------
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//-----------------------------------------------------------------------------------------------------
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// HEADER FILES
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//-----------------------------------------------------------------------------------------------------
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// Set this to 1 if we want to print debug messages to stderr
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#define IMAGE_DEBUG 0
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#include "image.h"
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#include <unordered_map>
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#define DR_PCX_IMPLEMENTATION
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#include "dr_pcx.h"
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#define STB_IMAGE_IMPLEMENTATION
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#include "stb_image.h"
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// The below include is a bad idea because of reasons mentioned in https://github.com/QB64-Phoenix-Edition/QB64pe/issues/172
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// However, we need a bunch of things like the 'qbs' and 'image' structs and some more
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// We'll likely keep the 'include' this way because I do not want to duplicate stuff and cause issues
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// Matt is already doing work to separate and modularize libqb
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// So, this will be replaced with relevant stuff once that work is done
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#include "../../libqb.h"
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//-----------------------------------------------------------------------------------------------------
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//-----------------------------------------------------------------------------------------------------
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// CONSTANTS
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//-----------------------------------------------------------------------------------------------------
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// This is returned to the caller if something goes wrong while loading the image
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#define INVALID_IMAGE_HANDLE -1
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//-----------------------------------------------------------------------------------------------------
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//-----------------------------------------------------------------------------------------------------
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// MACROS
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//-----------------------------------------------------------------------------------------------------
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// Calculates the RGB distance in the RGB color cube
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#define IMAGE_CALCULATE_RGB_DISTANCE(r1, g1, b1, r2, g2, b2) \
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sqrt(((float(r2) - float(r1)) * (float(r2) - float(r1))) + ((float(g2) - float(g1)) * (float(g2) - float(g1))) + \
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((float(b2) - float(b1)) * (float(b2) - float(b1))))
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#ifdef QB64_WINDOWS
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# define ZERO_VARIABLE(_v_) ZeroMemory(&(_v_), sizeof(_v_))
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#else
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# define ZERO_VARIABLE(_v_) memset(&(_v_), 0, sizeof(_v_))
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#endif
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//-----------------------------------------------------------------------------------------------------
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//-----------------------------------------------------------------------------------------------------
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// FORWARD DECLARATIONS
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//-----------------------------------------------------------------------------------------------------
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// These should be replaced with appropriate header files when Matt finishes cleaning up libqb
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void sub__freeimage(int32, int32); // Not declared in libqb.h
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extern img_struct *img; // Required by func__loadimage
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extern img_struct *write_page; // Required by func__loadimage
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extern uint32 palette_256[]; // Required by func__loadimage
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//-----------------------------------------------------------------------------------------------------
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//-----------------------------------------------------------------------------------------------------
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// FUNCTIONS
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//-----------------------------------------------------------------------------------------------------
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/// <summary>
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/// Decodes an image file using the dr_pcx & stb_image libraries.
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/// </summary>
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/// <param name="fileName">A valid filename</param>
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/// <param name="xOut">Out: width in pixels. This cannot be NULL</param>
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/// <param name="yOut">Out: height in pixels. This cannot be NULL</param>
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/// <returns>A pointer to the raw pixel data in RGBA format or NULL on failure</returns>
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static uint8_t *image_decode(const char *fileName, int *xOut, int *yOut) {
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auto compOut = 0;
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IMAGE_DEBUG_PRINT("Image dimensions (passed) = (%i, %i)", *xOut, *yOut);
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// Attempt to load file as a PCX first using dr_pcx
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auto pixels = drpcx_load_file(fileName, DRPCX_FALSE, xOut, yOut, &compOut, 4);
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IMAGE_DEBUG_PRINT("Image dimensions (dr_pcx) = (%i, %i)", *xOut, *yOut);
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if (!pixels) {
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// If dr_pcx failed to load, then use stb_image
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pixels = stbi_load(fileName, xOut, yOut, &compOut, 4);
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IMAGE_DEBUG_PRINT("Image dimensions (stb_image) = (%i, %i)", *xOut, *yOut);
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if (!pixels)
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return nullptr; // Return NULL if all attempts failed
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}
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IMAGE_DEBUG_CHECK(compOut > 2); // Returned component should always be 3 or more
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return pixels;
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}
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/// <summary>
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/// Clamps a color channel to the range 0 - 255.
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/// </summary>
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/// <param name="n">The color component</param>
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/// <returns>The clamped value</returns>
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static inline uint8_t image_clamp_component(int32_t n) {
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n &= -(n >= 0);
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return n | ((255 - n) >> 31);
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}
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/// <summary>
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/// This takes in a 32bpp (BGRA) image raw data and spits out an 8bpp raw image along with it's 256 color (BGRA) palette.
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/// </summary>
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/// <param name="src">The source raw image data. This must be in BGRA format and not NULL</param>
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/// <param name="w">The widht of the image in pixels</param>
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/// <param name="h">The height of the image in pixels</param>
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/// <param name="paletteOut">A 256 color palette if the operation was successful. This cannot be NULL</param>
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/// <returns>A pointer to a 8bpp raw image or NULL if operation failed</returns>
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static uint8_t *image_convert_8bpp(uint8_t *src, int w, int h, uint32_t *paletteOut) {
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static struct {
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uint32_t r, g, b;
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uint32_t count;
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} cubes[256];
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// https://en.wikipedia.org/wiki/Ordered_dithering
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static uint8_t bayerMatrix[16] = {0, 8, 2, 10, 12, 4, 14, 6, 3, 11, 1, 9, 15, 7, 13, 5};
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IMAGE_DEBUG_PRINT("Converting 32bpp image (%i, %i) to 8bpp", w, h);
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// Allocate memory for new image (8-bit indexed)
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auto pixels = (uint8_t *)malloc(w * h);
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if (!pixels) {
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return nullptr;
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}
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ZERO_VARIABLE(cubes);
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// Quantization phase
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auto dst = pixels;
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for (auto y = 0; y < h; y++) {
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for (auto x = 0; x < w; x++) {
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int32_t t = bayerMatrix[((y & 3) << 2) + (x & 3)];
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int32_t b = image_clamp_component((*src++) + (t << 1));
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int32_t g = image_clamp_component((*src++) + (t << 1));
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int32_t r = image_clamp_component((*src++) + (t << 1));
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++src; // Ignore alpha
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// Quantize
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uint8_t k = ((r >> 5) << 5) + ((g >> 5) << 2) + (b >> 6);
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(*dst++) = k;
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// Prepare RGB cubes for CLUT
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cubes[k].r += r;
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cubes[k].g += g;
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cubes[k].b += b;
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cubes[k].count++;
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}
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}
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// Generate a uniform CLUT based on the quantized colors
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for (auto i = 0; i < 256; i++) {
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if (cubes[i].count) {
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paletteOut[i] = IMAGE_MAKE_BGRA(cubes[i].r / cubes[i].count, cubes[i].g / cubes[i].count, cubes[i].b / cubes[i].count, 0xFF);
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} else {
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paletteOut[i] = IMAGE_MAKE_BGRA(0, 0, 0, 0xFF);
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}
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}
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return pixels;
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}
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/// <summary>
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/// This takes in a 32bpp (BGRA) image raw data and spits out an 8bpp raw image along with it's 256 color (BGRA) palette.
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/// If the number of unique colors in the 32bpp image > 256, then the functions returns a NULL.
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/// Unlike image_convert_8bpp(), no 'real' conversion takes place.
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/// </summary>
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/// <param name="src">The source raw image data. This must be in BGRA format and not NULL</param>
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/// <param name="w">The widht of the image in pixels</param>
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/// <param name="h">The height of the image in pixels</param>
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/// <param name="paletteOut">A 256 color palette if the operation was successful. This cannot be NULL</param>
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/// <returns>A pointer to a 8bpp raw image or NULL if operation failed</returns>
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static uint8_t *image_make_8bpp(uint8_t *src, int w, int h, uint32_t *paletteOut) {
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IMAGE_DEBUG_PRINT("Extracting 8bpp image (%i, %i) from 32bpp", w, h);
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unordered_map<uint32_t, int> colorMap;
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// Allocate memory for new image (8-bit indexed)
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auto pixels = (uint8_t *)malloc(w * h);
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if (!pixels) {
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return nullptr;
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}
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auto uniqueColors = 0; // As long as this is <= 256 we will keep going until we are done
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auto src32bpp = (uint32_t *)src;
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for (auto i = 0; i < w * h; i++) {
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auto srcColor = src32bpp[i];
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// Check if the src color exists in our palette
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if (colorMap.find(srcColor) == colorMap.end()) {
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// If we reached here, then the color is not in our table
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++uniqueColors;
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if (uniqueColors > 256) {
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IMAGE_DEBUG_PRINT("Image has more than 256 unique colors (%i)", uniqueColors);
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free(pixels);
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return nullptr; // Exit with failure if we have > 256 colors
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}
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paletteOut[uniqueColors - 1] = srcColor; // Store the color as unique
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colorMap[srcColor] = uniqueColors - 1; // Add this color to the map
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pixels[i] = uniqueColors - 1;
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} else {
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// If we reached here, then the color is in our table
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pixels[i] = colorMap[srcColor]; // Simply fetch the index from the map
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}
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}
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return pixels;
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}
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/// <summary>
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/// This modifies an *8bpp* image 'src' to use 'dst_pal' instead of 'src_pal'
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/// </summary>
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/// <param name="src">A pointer to the 8bpp image pixel data. This modifies data 'src' points to and cannot be NULL</param>
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/// <param name="w">The width of the image in pixels</param>
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/// <param name="h">The height of the image in pixels</param>
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/// <param name="src_pal">The image's original palette. This cannot be NULL</param>
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/// <param name="dst_pal">The destination palette. This cannot be NULL</param>
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static void image_remap_palette(uint8_t *src, int w, int h, uint32_t *src_pal, uint32_t *dst_pal) {
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static uint32_t palMap[256];
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IMAGE_DEBUG_PRINT("Remapping 8bpp image (%i, %i) palette", w, h);
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ZERO_VARIABLE(palMap);
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// Match the palette
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for (auto x = 0; x < 256; x++) {
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auto oldDist = IMAGE_CALCULATE_RGB_DISTANCE(0, 0, 0, 255, 255, 255); // The farthest we can go in the color cube
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for (auto y = 0; y < 256; y++) {
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auto newDist = IMAGE_CALCULATE_RGB_DISTANCE(IMAGE_GET_BGRA_RED(src_pal[x]), IMAGE_GET_BGRA_GREEN(src_pal[x]), IMAGE_GET_BGRA_BLUE(src_pal[x]),
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IMAGE_GET_BGRA_RED(dst_pal[y]), IMAGE_GET_BGRA_GREEN(dst_pal[y]), IMAGE_GET_BGRA_BLUE(dst_pal[y]));
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if (oldDist > newDist) {
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oldDist = newDist;
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palMap[x] = y;
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}
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}
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}
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// Update the bitmap to use the matched palette
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for (auto c = 0; c < (w * h); c++) {
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src[c] = palMap[src[c]];
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}
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}
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/// <summary>
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/// This function loads an image into memory and returns valid LONG image handle values that are less than -1.
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/// </summary>
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/// <param name="fileName">The filename of the image</param>
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/// <param name="bpp">Mode: 32=32bpp, 33=hardware acclerated 32bpp, 256=8bpp or 257=8bpp without palette remap</param>
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/// <param name="passed">How many parameters were passed?</param>
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/// <returns>Valid LONG image handle values that are less than -1 or -1 on failure</returns>
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int32_t func__loadimage(qbs *fileName, int32_t bpp, int32_t passed) {
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// QB string that we'll need null terminate the filename
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static qbs *fileNameZ = nullptr;
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if (new_error)
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return 0;
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if (!fileNameZ)
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fileNameZ = qbs_new(0, 0);
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auto isHardware = false;
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auto dontRemapPalette = false;
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// Handle special cases
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if (bpp == 33) {
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bpp = 32;
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isHardware = true;
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IMAGE_DEBUG_PRINT("Hardware image requested");
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} else if (bpp == 257) {
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bpp = 256;
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dontRemapPalette = true;
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IMAGE_DEBUG_PRINT("No palette remap requested");
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}
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// Validate bpp
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if (passed) {
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if ((bpp != 32) && (bpp != 256)) {
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error(5);
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return 0;
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}
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} else {
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if (write_page->text) {
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error(5);
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return 0;
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}
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bpp = -1;
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IMAGE_DEBUG_PRINT("BPP was not spcified. Defaulting to 32bpp");
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}
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qbs_set(fileNameZ, qbs_add(fileName, qbs_new_txt_len("\0", 1))); // s1 = filename + CHR$(0)
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if (fileNameZ->len == 1)
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return INVALID_IMAGE_HANDLE; // Return invalid handle if null length string
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int x, y;
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// Try to load the image
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auto pixels = image_decode((const char *)fileNameZ->chr, &x, &y);
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if (!pixels)
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return INVALID_IMAGE_HANDLE; // Return invalid handle if loading the image failed
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IMAGE_DEBUG_PRINT("'%s' successfully loaded", fileNameZ->chr);
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// Convert RGBA to BGRA
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auto cp = pixels;
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for (auto y2 = 0; y2 < y; y2++) {
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for (auto x2 = 0; x2 < x; x2++) {
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auto r = cp[0];
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auto b = cp[2];
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cp[0] = b;
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cp[2] = r;
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cp += 4;
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}
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}
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int32_t i; // Image handle to be returned
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// Convert image to 8bpp if requested by the user
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if (bpp == 256) {
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IMAGE_DEBUG_PRINT("Entering 8bpp path");
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i = func__newimage(x, y, 256, 1);
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if (i == -1) {
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free(pixels);
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return INVALID_IMAGE_HANDLE;
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}
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auto palette = (uint32_t *)malloc(256 * sizeof(uint32_t)); // 3 bytes for bgr + 1 for alpha (basically a uint32_t)
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if (!palette) {
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free(pixels);
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return INVALID_IMAGE_HANDLE;
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}
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auto pixels256 = image_make_8bpp(pixels, x, y, palette); // Try to simply 'extract' the 8bpp image first
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if (!pixels256) {
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pixels256 = image_convert_8bpp(pixels, x, y, palette); // If that fails, then 'convert' it to 8bpp
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if (!pixels256) {
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free(palette);
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free(pixels);
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return INVALID_IMAGE_HANDLE;
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}
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}
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if (dontRemapPalette) {
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// Copy the 8bpp pixel data and then free it
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memcpy(img[-i].offset, pixels256, x * y);
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free(pixels256);
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// Copy the palette and then free it
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memcpy(img[-i].pal, palette, 256 * sizeof(uint32_t));
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free(palette);
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} else {
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// Remap the image indexes to QB64 default palette and then free our palette
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image_remap_palette(pixels256, x, y, palette, palette_256);
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free(palette);
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// Copy the 8bpp pixel data and then free it
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memcpy(img[-i].offset, pixels256, x * y);
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free(pixels256);
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// Copy the default QB64 palette
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memcpy(img[-i].pal, palette_256, 256 * sizeof(uint32_t));
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}
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} else {
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IMAGE_DEBUG_PRINT("Entering 32bpp path");
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i = func__newimage(x, y, 32, 1);
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if (i == -1) {
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free(pixels);
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return INVALID_IMAGE_HANDLE;
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}
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memcpy(img[-i].offset, pixels, x * y * sizeof(uint32_t));
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}
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// Free pixel memory. We can do this because both dr_pcx and stb_image uses free()
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free(pixels);
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// This only executes if bpp is 32
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if (isHardware) {
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IMAGE_DEBUG_PRINT("Making hardware image");
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auto iHardware = func__copyimage(i, 33, 1);
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sub__freeimage(i, 1);
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i = iHardware;
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}
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IMAGE_DEBUG_PRINT("Returning handle value = %i", i);
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return i;
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}
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//-----------------------------------------------------------------------------------------------------
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//-----------------------------------------------------------------------------------------------------
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