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225 lines
7.1 KiB
V
225 lines
7.1 KiB
V
// Copyright (c) 2019-2023 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module stbi
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[if trace_stbi_allocations ?]
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fn trace_allocation(message string) {
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eprintln(message)
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}
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[export: 'stbi__callback_malloc']
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fn cb_malloc(s usize) voidptr {
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res := unsafe { malloc(isize(s)) }
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trace_allocation('> stbi__callback_malloc: ${s} => ${ptr_str(res)}')
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return res
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}
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[export: 'stbi__callback_realloc']
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fn cb_realloc(p voidptr, s usize) voidptr {
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res := unsafe { v_realloc(p, isize(s)) }
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trace_allocation('> stbi__callback_realloc: ${ptr_str(p)} , ${s} => ${ptr_str(res)}')
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return res
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}
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[export: 'stbi__callback_free']
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fn cb_free(p voidptr) {
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trace_allocation('> stbi__callback_free: ${ptr_str(p)}')
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unsafe { free(p) }
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}
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#flag -I @VEXEROOT/thirdparty/stb_image
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#include "stb_image.h"
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#include "stb_image_write.h"
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#include "stb_image_resize.h"
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#include "stb_v_header.h"
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#flag @VEXEROOT/thirdparty/stb_image/stbi.o
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pub struct Image {
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pub mut:
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width int
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height int
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nr_channels int
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ok bool
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data voidptr
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ext string
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}
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//-----------------------------------------------------------------------------
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//
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// Configuration functions
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//
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//-----------------------------------------------------------------------------
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fn C.stbi_set_flip_vertically_on_load(should_flip int)
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fn C.stbi_flip_vertically_on_write(flag int)
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fn C.set_png_compression_level(level int)
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fn C.write_force_png_filter(level int)
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fn C.write_tga_with_rle(level int)
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pub fn set_flip_vertically_on_load(val bool) {
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C.stbi_set_flip_vertically_on_load(val)
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}
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pub fn set_flip_vertically_on_write(val bool) {
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C.stbi_flip_vertically_on_write(val)
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}
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// set_png_compression_level set the PNG compression level during the writing process
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// defaults to 8; set to higher for more compression
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pub fn set_png_compression_level(level int) {
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C.set_png_compression_level(level)
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}
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// write_force_png_filter defaults to -1; set to 0..5 to force a filter mode
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// the filter algorithms that can be applied before compression. The purpose of these filters is to prepare the image data for optimum compression.
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// Type Name
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//
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// 0 None
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// 1 Sub
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// 2 Up
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// 3 Average
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// 4 Paeth
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pub fn write_force_png_filter(level int) {
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C.write_force_png_filter(level)
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}
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// stbi_write_tga_with_rle enable/disable the TGA RLE during the writing process
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// defaults to true; set to false to disable RLE in tga
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pub fn write_tga_with_rle(flag bool) {
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C.write_tga_with_rle(if flag { 1 } else { 0 })
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}
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//-----------------------------------------------------------------------------
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//
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// Utility functions
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//
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//-----------------------------------------------------------------------------
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fn C.stbi_image_free(retval_from_stbi_load &u8)
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pub fn (img &Image) free() {
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C.stbi_image_free(img.data)
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}
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//-----------------------------------------------------------------------------
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//
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// Load functions
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//
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//-----------------------------------------------------------------------------
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fn C.stbi_load(filename &char, x &int, y &int, channels_in_file &int, desired_channels int) &u8
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fn C.stbi_load_from_file(f voidptr, x &int, y &int, channels_in_file &int, desired_channels int) &u8
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fn C.stbi_load_from_memory(buffer &u8, len int, x &int, y &int, channels_in_file &int, desired_channels int) &u8
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// load load an image from a path
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pub fn load(path string) !Image {
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ext := path.all_after_last('.')
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mut res := Image{
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ok: true
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ext: ext
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data: 0
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}
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res.data = C.stbi_load(&char(path.str), &res.width, &res.height, &res.nr_channels,
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C.STBI_rgb_alpha)
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if isnil(res.data) {
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return error('stbi_image failed to load from "${path}"')
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}
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return res
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}
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// load_from_memory load an image from a memory buffer
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pub fn load_from_memory(buf &u8, bufsize int) !Image {
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mut res := Image{
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ok: true
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data: 0
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}
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flag := C.STBI_rgb_alpha
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res.data = C.stbi_load_from_memory(buf, bufsize, &res.width, &res.height, &res.nr_channels,
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flag)
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if isnil(res.data) {
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return error('stbi_image failed to load from memory')
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}
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return res
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}
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//-----------------------------------------------------------------------------
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//
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// Resize functions
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//
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//-----------------------------------------------------------------------------
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fn C.stbir_resize_uint8(input_pixels &u8, input_w int, input_h int, input_stride_in_bytes int, output_pixels &u8, output_w int, output_h int, output_stride_in_bytes int, num_channels int) int
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// resize_uint8 resizes `img` to dimensions of `output_w` and `output_h`
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pub fn resize_uint8(img &Image, output_w int, output_h int) !Image {
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mut res := Image{
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ok: true
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ext: img.ext
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data: 0
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width: output_w
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height: output_h
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nr_channels: img.nr_channels
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}
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res.data = cb_malloc(usize(output_w * output_h * img.nr_channels))
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if res.data == 0 {
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return error('stbi_image failed to resize file')
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}
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if 0 == C.stbir_resize_uint8(img.data, img.width, img.height, 0, res.data, output_w,
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output_h, 0, img.nr_channels) {
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return error('stbi_image failed to resize file')
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}
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return res
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}
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//-----------------------------------------------------------------------------
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//
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// Write functions
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//
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//-----------------------------------------------------------------------------
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fn C.stbi_write_png(filename &char, w int, h int, comp int, buffer &u8, stride_in_bytes int) int
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fn C.stbi_write_bmp(filename &char, w int, h int, comp int, buffer &u8) int
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fn C.stbi_write_tga(filename &char, w int, h int, comp int, buffer &u8) int
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fn C.stbi_write_jpg(filename &char, w int, h int, comp int, buffer &u8, quality int) int
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// fn C.stbi_write_hdr(filename &char, w int, h int, comp int, buffer &byte) int // buffer &byte => buffer &f32
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// stbi_write_png write on path a PNG file
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// row_stride_in_bytes is usually equal to: w * comp
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pub fn stbi_write_png(path string, w int, h int, comp int, buf &u8, row_stride_in_bytes int) ! {
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if 0 == C.stbi_write_png(&char(path.str), w, h, comp, buf, row_stride_in_bytes) {
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return error('stbi_image failed to write png file to "${path}"')
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}
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}
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// stbi_write_png write on path a BMP file
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pub fn stbi_write_bmp(path string, w int, h int, comp int, buf &u8) ! {
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if 0 == C.stbi_write_bmp(&char(path.str), w, h, comp, buf) {
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return error('stbi_image failed to write bmp file to "${path}"')
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}
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}
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// stbi_write_png write on path a TGA file
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pub fn stbi_write_tga(path string, w int, h int, comp int, buf &u8) ! {
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if 0 == C.stbi_write_tga(&char(path.str), w, h, comp, buf) {
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return error('stbi_image failed to write tga file to "${path}"')
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}
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}
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// stbi_write_png write on path a JPG file
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// quality select the compression quality of the JPG
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// quality is between 1 and 100. Higher quality looks better but results in a bigger image.
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pub fn stbi_write_jpg(path string, w int, h int, comp int, buf &u8, quality int) ! {
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if 0 == C.stbi_write_jpg(&char(path.str), w, h, comp, buf, quality) {
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return error('stbi_image failed to write jpg file to "${path}"')
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}
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}
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/*
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pub fn stbi_write_hdr(path string, w int, h int, comp int, buf &byte) ! {
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if 0 == C.stbi_write_hdr(&char(path.str), w , h , comp , buf){
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return error('stbi_image failed to write hdr file to "$path"')
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}
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}
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*/
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