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WIP: colourspace example now draws text with image info & colourspaces
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Signed-off-by: Gary Oberbrunner <garyo@darkstarsystems.com>
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@garyo
garyo committed May 9, 2024
1 parent 37d3121 commit ea30f20
Showing 1 changed file with 133 additions and 32 deletions.
165 changes: 133 additions & 32 deletions Examples/ColorSpace/colorspace.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,116 @@ struct MyInstanceData {
OfxParamHandle scaleAParam;
};

template <class T>
static constexpr T lerp(T a, T b, float amount) {
return a + amount * (b - a);
}

#define COMP_WHITE_OVER(a, b, bg_opacity) \
do { \
(a) = lerp((a) * (1.0f - (bg_opacity)), white, (b)); \
} while (0)

/**
* Draw a string of text at the given position in the image
*/
static void drawText(const std::string &message, int x, int y,
unsigned int font_height,
void *image, int xdim,
int ydim, int bits, int nchannels, int rowbytes) {
auto txt_img = cimg_library::CImg<float>();
float fg[] = {1.0f};
float bg[] = {0};
// this will create an image just big enough to hold the text
txt_img.draw_text(0, 0, message.c_str(), fg, bg, 1.0, font_height);
int txt_width = txt_img.width();
int txt_height = txt_img.height();
bool invert = true; // CImg is top-down, opposite of OpenFX (bottom up)
if (rowbytes < 0) // unless the image has negative rowbytes
invert = false;
// iy here is image y, ty is text-image y; same for x
switch (bits) {
case 8: {
using T = unsigned char;
float white = 255.0f;
float color_scale = 1.0f/256.0f;
float bg_opacity = 0.2f;
for (int iy = y, ty = 0; iy < ydim && ty < txt_height; iy++, ty++) {
T *row = (T *)((unsigned char *)image + iy * rowbytes);
float *txt_row = txt_img.data(0, invert ? txt_height - 1 - ty : ty);
for (int ix = x, tx = 0; ix < xdim && tx < txt_width; ix++, tx++) {
switch (nchannels) {
case 1: // Alpha only
row[ix*4] = std::max(row[ix*4], (T)(txt_row[tx] * color_scale));
case 3: // RGB
COMP_WHITE_OVER(row[ix*3], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*3+1], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*3+2], txt_row[tx], bg_opacity);
case 4: // RGBA
COMP_WHITE_OVER(row[ix*4], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*4+1], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*4+2], txt_row[tx], bg_opacity);
// alpha
row[ix*4+3] = std::max(row[ix*4+3], (T)(txt_row[tx] * color_scale));
}
}
}
} break;
case 16: {
using T = unsigned short;
float white = 65535.0f;
float color_scale = 1.0f/65536.0f;
float bg_opacity = 0.2f;
for (int iy = y, ty = 0; iy < ydim && ty < txt_height; iy++, ty++) {
T *row = (T *)((unsigned char *)image + iy * rowbytes);
float *txt_row = txt_img.data(0, invert ? txt_height - 1 - ty : ty);
for (int ix = x, tx = 0; ix < xdim && tx < txt_width; ix++, tx++) {
switch (nchannels) {
case 1: // Alpha only
row[ix*4] = std::max(row[ix*4], (T)(txt_row[tx] * color_scale));
case 3: // RGB
COMP_WHITE_OVER(row[ix*3], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*3+1], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*3+2], txt_row[tx], bg_opacity);
case 4: // RGBA
COMP_WHITE_OVER(row[ix*4], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*4+1], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*4+2], txt_row[tx], bg_opacity);
// alpha
row[ix*4+3] = std::max(row[ix*4+3], (T)(txt_row[tx] * color_scale));
}
}
}
} break;
case 32: {
float white = 1.0f;
float bg_opacity = 0.2f;
for (int iy = y, ty = 0; iy < ydim && ty < txt_height; iy++, ty++) {
float *row = (float *)((unsigned char *)image + iy * rowbytes);
float *txt_row = txt_img.data(0, invert ? txt_height - 1 - ty : ty);
for (int ix = x, tx = 0; ix < xdim && tx < txt_width; ix++, tx++) {
switch (nchannels) {
case 1: // Alpha only
row[ix*4] = std::max(row[ix*4], txt_row[tx]);
case 3: // RGB
COMP_WHITE_OVER(row[ix*3], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*3+1], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*3+2], txt_row[tx], bg_opacity);
case 4: // RGBA
COMP_WHITE_OVER(row[ix*4], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*4+1], txt_row[tx], bg_opacity);
COMP_WHITE_OVER(row[ix*4+2], txt_row[tx], bg_opacity);
// alpha
row[ix*4+3] = std::max(row[ix*4+3], txt_row[tx]);
}
}
} break;
}
}
}



/* mandatory function to set up the host structures */


Expand Down Expand Up @@ -393,6 +503,13 @@ static OfxStatus render( OfxImageEffectHandle instance,
gPropHost->propGetDouble(inArgs, kOfxPropTime, 0, &time);
gPropHost->propGetIntN(inArgs, kOfxImageEffectPropRenderWindow, 4, &renderWindow.x1);

double renderScale[2];
OfxStatus st = gPropHost->propGetDoubleN(inArgs, kOfxImageEffectPropRenderScale, 2,
renderScale);
if (st != kOfxStatOK) {
spdlog::warn("Can't get render scale! {}", errMsg(st));
renderScale[0] = renderScale[1] = 1.0f;
}
// retrieve any instance data associated with this effect
MyInstanceData *myData = getMyInstanceData(instance);

Expand Down Expand Up @@ -428,39 +545,23 @@ static OfxStatus render( OfxImageEffectHandle instance,
// do the rendering

int nchannels = 4;
int font_height = 128;
int font_height = 50 * renderScale[0];
spdlog::info("Rendering {}x{} image @{},{}, depth={}", xdim, ydim, srcRect.x1, srcRect.y1, dstBitDepth);
switch(dstBitDepth) {
case 8 : {
using T = unsigned char;
auto img = cimg_library::CImg<T>((const T *)src, xdim, ydim, 1, nchannels, true);
T fg[] = {255, 255, 0, 255};
T bg[] = {0, 0, 0, 0};
img.draw_text(100, 100, "Test (byte)!", fg, bg, 1.0, font_height);
memcpy(dst, src, srcRowBytes * ydim * nchannels);
}
break;
case 16 : {
using T = unsigned short;
auto img = cimg_library::CImg<T>((const T *)src, xdim, ydim, 1, nchannels, true);
T fg[] = {65535, 65535, 0, 65535};
T bg[] = {0, 0, 0, 0};
img.draw_text(100, 100, "Test (short)!", fg, bg, 1.0, font_height);
memcpy(dst, src, srcRowBytes * ydim * nchannels);
}
break;
case 32 : {
using T = float;
auto img = cimg_library::CImg<T>((const T *)src, xdim, ydim, 1, nchannels, true);
T fg[] = {1.0, 0.0, 1.0, 1.0};
T bg[] = {0, 0, 0, 0};
img.mirror('y');
img.draw_text(100, 100, "Test (float)!", fg, bg, 1.0, font_height);
img.mirror('y');
memcpy(dst, src, srcRowBytes * ydim * nchannels);
}
break;
}

// Just copy from source to dest, and draw some text
if (srcRowBytes < 0 && dstRowBytes < 0)
memcpy((char *)dst + dstRowBytes * (ydim-1), (char*)src + srcRowBytes * (ydim-1), srcRowBytes * ydim);
else
memcpy(dst, src, srcRowBytes * ydim);
int ystart = ydim - 100;
drawText(fmt::format("Image: {}x{}, depth={}, scale={:.2f}x{:.2f}", xdim, ydim, dstBitDepth, renderScale[0], renderScale[1]),
100, ystart, font_height, dst, xdim, ydim, dstBitDepth, nchannels, dstRowBytes);
ystart -= font_height;
drawText(fmt::format("input colourspace: {}", inputColourspace),
100, ystart, font_height, dst, xdim, ydim, dstBitDepth, nchannels, dstRowBytes);
ystart -= font_height;
drawText(fmt::format("output colourspace: {}", outputColourspace),
100, ystart, font_height, dst, xdim, ydim, dstBitDepth, nchannels, dstRowBytes);
}
catch(OfxuNoImageException &ex) {
// if we were interrupted, the failed fetch is fine, just return kOfxStatOK
Expand Down

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