void IMB_buffer_float_premultiply(float *buf, int width, int height) { size_t total = ((size_t)width) * height; float *fp = buf; while (total--) { straight_to_premul_v4(fp); fp += 4; } }
void BrightnessOperation::executePixelSampled(float output[4], float x, float y, PixelSampler sampler) { float inputValue[4]; float a, b; float inputBrightness[4]; float inputContrast[4]; this->m_inputProgram->readSampled(inputValue, x, y, sampler); this->m_inputBrightnessProgram->readSampled(inputBrightness, x, y, sampler); this->m_inputContrastProgram->readSampled(inputContrast, x, y, sampler); float brightness = inputBrightness[0]; float contrast = inputContrast[0]; brightness /= 100.0f; float delta = contrast / 200.0f; a = 1.0f - delta * 2.0f; /* * The algorithm is by Werner D. Streidt * (http://visca.com/ffactory/archives/5-99/msg00021.html) * Extracted of OpenCV demhist.c */ if (contrast > 0) { a = 1.0f / a; b = a * (brightness - delta); } else { delta *= -1; b = a * (brightness + delta); } if (this->m_use_premultiply) { premul_to_straight_v4(inputValue); } output[0] = a * inputValue[0] + b; output[1] = a * inputValue[1] + b; output[2] = a * inputValue[2] + b; output[3] = inputValue[3]; if (this->m_use_premultiply) { straight_to_premul_v4(output); } }
/* used for both 3d view and image window */ void paint_sample_color(bContext *C, ARegion *ar, int x, int y, bool texpaint_proj, bool use_palette) { Scene *scene = CTX_data_scene(C); Paint *paint = BKE_paint_get_active_from_context(C); Palette *palette = BKE_paint_palette(paint); PaletteColor *color; Brush *br = BKE_paint_brush(BKE_paint_get_active_from_context(C)); unsigned int col; const unsigned char *cp; CLAMP(x, 0, ar->winx); CLAMP(y, 0, ar->winy); if (use_palette) { if (!palette) { palette = BKE_palette_add(CTX_data_main(C), "Palette"); BKE_paint_palette_set(paint, palette); } color = BKE_palette_color_add(palette); } if (CTX_wm_view3d(C) && texpaint_proj) { /* first try getting a colour directly from the mesh faces if possible */ Object *ob = OBACT; bool sample_success = false; if (ob) { DerivedMesh *dm = mesh_get_derived_final(scene, ob, CD_MASK_BAREMESH); ViewContext vc; const int mval[2] = {x, y}; unsigned int faceindex; unsigned int totface = dm->getNumTessFaces(dm); MTFace *dm_mtface = dm->getTessFaceDataArray(dm, CD_MTFACE); DM_update_materials(dm, ob); if (dm_mtface) { view3d_set_viewcontext(C, &vc); view3d_operator_needs_opengl(C); if (imapaint_pick_face(&vc, mval, &faceindex, totface)) { Image *image = imapaint_face_image(dm, faceindex); ImBuf *ibuf = BKE_image_acquire_ibuf(image, NULL, NULL); if (ibuf && ibuf->rect) { float uv[2]; float u, v; imapaint_pick_uv(scene, ob, faceindex, mval, uv); sample_success = true; u = fmodf(uv[0], 1.0f); v = fmodf(uv[1], 1.0f); if (u < 0.0f) u += 1.0f; if (v < 0.0f) v += 1.0f; u = u * ibuf->x - 0.5f; v = v * ibuf->y - 0.5f; if (ibuf->rect_float) { float rgba_f[4]; bilinear_interpolation_color_wrap(ibuf, NULL, rgba_f, u, v); straight_to_premul_v4(rgba_f); if (use_palette) { linearrgb_to_srgb_v3_v3(color->rgb, rgba_f); } else { linearrgb_to_srgb_v3_v3(rgba_f, rgba_f); BKE_brush_color_set(scene, br, rgba_f); } } else { unsigned char rgba[4]; bilinear_interpolation_color_wrap(ibuf, rgba, NULL, u, v); if (use_palette) { rgb_uchar_to_float(color->rgb, rgba); } else { float rgba_f[3]; rgb_uchar_to_float(rgba_f, rgba); BKE_brush_color_set(scene, br, rgba_f); } } } BKE_image_release_ibuf(image, ibuf, NULL); } } dm->release(dm); } if (!sample_success) { glReadBuffer(GL_FRONT); glReadPixels(x + ar->winrct.xmin, y + ar->winrct.ymin, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, &col); glReadBuffer(GL_BACK); } else return; } else { glReadBuffer(GL_FRONT); glReadPixels(x + ar->winrct.xmin, y + ar->winrct.ymin, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE, &col); glReadBuffer(GL_BACK); } cp = (unsigned char *)&col; if (use_palette) { rgb_uchar_to_float(color->rgb, cp); } else { float rgba_f[3]; rgb_uchar_to_float(rgba_f, cp); BKE_brush_color_set(scene, br, rgba_f); } }